United States Census Bureau
The United States Census Bureau is a principal agency of the U. S. Federal Statistical System, responsible for producing data about the American people and economy; the Census Bureau is part of the U. S. Department of Commerce and its director is appointed by the President of the United States; the Census Bureau's primary mission is conducting the U. S. Census every ten years, which allocates the seats of the U. S. House of Representatives to the states based on their population; the Bureau's various censuses and surveys help allocate over $400 billion in federal funds every year and it helps states, local communities, businesses make informed decisions. The information provided by the census informs decisions on where to build and maintain schools, transportation infrastructure, police and fire departments. In addition to the decennial census, the Census Bureau continually conducts dozens of other censuses and surveys, including the American Community Survey, the U. S. Economic Census, the Current Population Survey.
Furthermore and foreign trade indicators released by the federal government contain data produced by the Census Bureau. Article One of the United States Constitution directs the population be enumerated at least once every ten years and the resulting counts used to set the number of members from each state in the House of Representatives and, by extension, in the Electoral College; the Census Bureau now conducts a full population count every 10 years in years ending with a zero and uses the term "decennial" to describe the operation. Between censuses, the Census Bureau makes population projections. In addition, Census data directly affects how more than $400 billion per year in federal and state funding is allocated to communities for neighborhood improvements, public health, education and more; the Census Bureau is mandated with fulfilling these obligations: the collecting of statistics about the nation, its people, economy. The Census Bureau's legal authority is codified in Title 13 of the United States Code.
The Census Bureau conducts surveys on behalf of various federal government and local government agencies on topics such as employment, health, consumer expenditures, housing. Within the bureau, these are known as "demographic surveys" and are conducted perpetually between and during decennial population counts; the Census Bureau conducts economic surveys of manufacturing, retail and other establishments and of domestic governments. Between 1790 and 1840, the census was taken by marshals of the judicial districts; the Census Act of 1840 established a central office. Several acts followed that revised and authorized new censuses at the 10-year intervals. In 1902, the temporary Census Office was moved under the Department of Interior, in 1903 it was renamed the Census Bureau under the new Department of Commerce and Labor; the department was intended to consolidate overlapping statistical agencies, but Census Bureau officials were hindered by their subordinate role in the department. An act in 1920 changed the date and authorized manufacturing censuses every two years and agriculture censuses every 10 years.
In 1929, a bill was passed mandating the House of Representatives be reapportioned based on the results of the 1930 Census. In 1954, various acts were codified into Title 13 of the US Code. By law, the Census Bureau must count everyone and submit state population totals to the U. S. President by December 31 of any year ending in a zero. States within the Union receive the results in the spring of the following year; the United States Census Bureau defines four statistical regions, with nine divisions. The Census Bureau regions are "widely used...for data collection and analysis". The Census Bureau definition is pervasive. Regional divisions used by the United States Census Bureau: Region 1: Northeast Division 1: New England Division 2: Mid-Atlantic Region 2: Midwest Division 3: East North Central Division 4: West North Central Region 3: South Division 5: South Atlantic Division 6: East South Central Division 7: West South Central Region 4: West Division 8: Mountain Division 9: Pacific Many federal, state and tribal governments use census data to: Decide the location of new housing and public facilities, Examine the demographic characteristics of communities and the US, Plan transportation systems and roadways, Determine quotas and creation of police and fire precincts, Create localized areas for elections, utilities, etc.
Gathers population information every 10 years The United States Census Bureau is committed to confidentiality, guarantees non-disclosure of any addresses or personal information related to individuals or establishments. Title 13 of the U. S. Code establishes penalties for the disclosure of this information. All Census employees must sign an affidavit of non-disclosure prior to employment; the Bureau cannot share responses, addresses or personal information with anyone including United States or foreign government
A census is the procedure of systematically acquiring and recording information about the members of a given population. The term is used in connection with national population and housing censuses; the United Nations defines the essential features of population and housing censuses as "individual enumeration, universality within a defined territory and defined periodicity", recommends that population censuses be taken at least every 10 years. United Nations recommendations cover census topics to be collected, official definitions and other useful information to co-ordinate international practice; the word is of Latin origin: during the Roman Republic, the census was a list that kept track of all adult males fit for military service. The modern census is essential to international comparisons of any kind of statistics, censuses collect data on many attributes of a population, not just how many people there are. Censuses began as the only method of collecting national demographic data, are now part of a larger system of different surveys.
Although population estimates remain an important function of a census, including the geographic distribution of the population, statistics can be produced about combinations of attributes e.g. education by age and sex in different regions. Current administrative data systems allow for other approaches to enumeration with the same level of detail but raise concerns about privacy and the possibility of biasing estimates. A census can be contrasted with sampling in which information is obtained only from a subset of a population. Modern census data are used for research, business marketing, planning, as a baseline for designing sample surveys by providing a sampling frame such as an address register. Census counts are necessary to adjust samples to be representative of a population by weighting them as is common in opinion polling. Stratification requires knowledge of the relative sizes of different population strata which can be derived from census enumerations. In some countries, the census provides the official counts used to apportion the number of elected representatives to regions.
In many cases, a chosen random sample can provide more accurate information than attempts to get a population census. A census is construed as the opposite of a sample as its intent is to count everyone in a population rather than a fraction. However, population censuses rely on a sampling frame to count the population; this is the only way to be sure that everyone has been included as otherwise those not responding would not be followed up on and individuals could be missed. The fundamental premise of a census is that the population is not known and a new estimate is to be made by the analysis of primary data; the use of a sampling frame is counterintuitive as it suggests that the population size is known. However, a census is used to collect attribute data on the individuals in the nation; this process of sampling marks the difference between historical census, a house to house process or the product of an imperial decree, the modern statistical project. The sampling frame used by census is always an address register.
Thus it is not known how many people there are in each household. Depending on the mode of enumeration, a form is sent to the householder, an enumerator calls, or administrative records for the dwelling are accessed; as a preliminary to the dispatch of forms, census workers will check any address problems on the ground. While it may seem straightforward to use the postal service file for this purpose, this can be out of date and some dwellings may contain a number of independent households. A particular problem is what are termed'communal establishments' which category includes student residences, religious orders, homes for the elderly, people in prisons etc; as these are not enumerated by a single householder, they are treated differently and visited by special teams of census workers to ensure they are classified appropriately. Individuals are counted within households and information is collected about the household structure and the housing. For this reason international documents refer to censuses of housing.
The census response is made by a household, indicating details of individuals resident there. An important aspect of census enumerations is determining which individuals can be counted from which cannot be counted. Broadly, three definitions can be used: de facto residence; this is important to consider individuals who have temporary addresses. Every person should be identified uniquely as resident in one place but where they happen to be on Census Day, their de facto residence, may not be the best place to count them. Where an individual uses services may be more useful and this is at their usual, or de jure, residence. An individual may be represented at a permanent address a family home for students or long term migrants, it is necessary to have a precise definition of residence to decide whether visitors to a country should be included in the population count. This is becoming more important as students travel abroad for education for a period of several years. Other groups causing problems of enumeration are new born babies, people away on holiday, people moving home around census day, people without a fixed address.
People having second homes because of working in another part of the country or retaining a holiday cottage are dif
Marriage called matrimony or wedlock, is a or ritually recognised union between spouses that establishes rights and obligations between those spouses, as well as between them and any resulting biological or adopted children and affinity. The definition of marriage varies around the world not only between cultures and between religions, but throughout the history of any given culture and religion, evolving to both expand and constrict in who and what is encompassed, but it is principally an institution in which interpersonal relationships sexual, are acknowledged or sanctioned. In some cultures, marriage is recommended or considered to be compulsory before pursuing any sexual activity; when defined broadly, marriage is considered a cultural universal. A marriage ceremony is known as a wedding. Individuals may marry for several reasons, including legal, libidinal, financial and religious purposes. Whom they marry may be influenced by gender determined rules of incest, prescriptive marriage rules, parental choice and individual desire.
In some areas of the world, arranged marriage, child marriage and sometimes forced marriage, may be practiced as a cultural tradition. Conversely, such practices may be outlawed and penalized in parts of the world out of concerns of the infringement of women's rights, or the infringement of children's rights, because of international law. Around the world in developed democracies, there has been a general trend towards ensuring equal rights within marriage for women and recognizing the marriages of interfaith and same-sex couples; these trends coincide with the broader human rights movement. Marriage can be recognized by a state, an organization, a religious authority, a tribal group, a local community, or peers, it is viewed as a contract. When a marriage is performed and carried out by a government institution in accordance with the marriage laws of the jurisdiction, without religious content, it is a civil marriage. Civil marriage recognizes and creates the rights and obligations intrinsic to matrimony before the state.
When a marriage is performed with religious content under the auspices of a religious institution it is a religious marriage. Religious marriage recognizes and creates the rights and obligations intrinsic to matrimony before that religion. Religious marriage is known variously as sacramental marriage in Catholicism, nikah in Islam, nissuin in Judaism, various other names in other faith traditions, each with their own constraints as to what constitutes, who can enter into, a valid religious marriage; some countries do not recognize locally performed religious marriage on its own, require a separate civil marriage for official purposes. Conversely, civil marriage does not exist in some countries governed by a religious legal system, such as Saudi Arabia, where marriages contracted abroad might not be recognized if they were contracted contrary to Saudi interpretations of Islamic religious law. In countries governed by a mixed secular-religious legal system, such as in Lebanon and Israel, locally performed civil marriage does not exist within the country, preventing interfaith and various other marriages contradicting religious laws from being entered into in the country, civil marriages performed abroad are recognized by the state if they conflict with religious laws.
The act of marriage creates normative or legal obligations between the individuals involved, any offspring they may produce or adopt. In terms of legal recognition, most sovereign states and other jurisdictions limit marriage to opposite-sex couples and a diminishing number of these permit polygyny, child marriages, forced marriages. In modern times, a growing number of countries developed democracies, have lifted bans on and have established legal recognition for the marriages of interfaith and same-sex couples; some cultures allow the dissolution of marriage through annulment. In some areas, child marriages and polygamy may occur in spite of national laws against the practice. Since the late twentieth century, major social changes in Western countries have led to changes in the demographics of marriage, with the age of first marriage increasing, fewer people marrying, more couples choosing to cohabit rather than marry. For example, the number of marriages in Europe decreased by 30% from 1975 to 2005.
In most cultures, married women had few rights of their own, being considered, along with the family's children, the property of the husband. In Europe, the United States, other places in the developed world, beginning in the late 19th century and lasting through the 21st century, marriage has undergone gradual legal changes, aimed at improving the rights of the wife; these changes included giving wives legal identities of their own, abolishing the right of husbands to physically discipline their wives, giving wives property rights, liberalizing divorce laws, providing wives with reproductive rights of their own, requiring a wife's consent when sexual relations occur. These changes have occurred in Western countries. In the 21st century, there continue to be controversies regarding the legal status of married women, legal acceptance of or leniency towards violence within marriage, traditional marriage customs such as dowry and bride price, for
Hidalgo County, Texas
Hidalgo County is a county in the U. S. state of Texas. The county seat is Edinburg and the largest city is McAllen; the county is named for Miguel Hidalgo y Costilla, the priest who raised the call for Mexico's independence from Spain. It is located in the Rio Grande Valley of South Texas and is one of the fastest-growing counties in the United States; as of the 2017 census, the population was 860,661, making it the eighth-most populous county in Texas. Hidalgo County is designated by the U. S. Census Bureau as the McAllen-Edinburg-Mission Metropolitan Statistical Area, which itself is part of the McAllen-Edinburg-Mission-Rio Grande City Combined Statistical Area with neighboring Starr County. According to the U. S. Census Bureau, the county has a total area of 1,583 square miles, of which 1,571 square miles are land and 12 square miles are covered by water; the northern part of the county has sandy and light loamy soils over deep reddish or mottled, clayey subsoils. In some areas, limestone lies within 40 inches of the surface.
The southern part of the county has moderately deep to deep loamy surfaces over clayey subsoils. Along the Rio Grande, brown to red clays occur. Hidalgo County is in the South Texas Plains vegetation area, which features grasses, live oaks, chaparral. Native plants, reduced in recent years by extensive farming, include chapote, ebony, huisache and yucca. In 1982, 91% of the land was in farms and ranches, with 52% of the farmland under cultivation and 85% irrigated; the primary crops were sorghum, cotton and vegetables. The primary fruits and nuts grown in the county were grapefruit and pecans. Cattle, milk cows, hogs were the primary livestock products. Natural resources included caliche, gravel and gas. Oil and gas production in 1982 totaled 98,487,211,000 cubic feet of gas-well gas, 139,995 barrels of crude oil, 1,101,666 barrels of condensate, 15,784,000 cubic feet of casinghead gas; the climate is subhumid. Temperatures range from an average low of 47 °F in January to an average high to 96 °F in July.
Rainfall averages 23 inches a year, the growing season lasts for 320 days of the year. Lower Rio Grande Valley National Wildlife Refuge Santa Ana National Wildlife Refuge As of the 2015 Texas Population Estimate Program, the population of the county was 841,667, non-Hispanic whites 62,232. Black Americans 2,973. Other non-Hispanic 11,106. Hispanics and Latinos 765,356; as of the 2010 United States Census, there were 774,769 people residing in the county. 88.0% were White, 1.0% Asian, 0.6% Black or African American, 0.3% Native American, 8.8% of some other race and 1.3% of two or more races. 90.6% were Hispanic or Latino. There were 216,471 households, 179,668 families residing in the county; the population density was 363 people per square mile. There were 248,287 housing units at an average density of 123 per square mile. There were 216,471 households out of which 54.2% had children under the age of 18 living with them, 65.00% were married couples living together, 18.8% had a female householder with no husband present, 17.0% were non-families.
14.0% of all households were made up of individuals and 5.6% had someone living alone, 65 years of age or older. The average household size was 3.55 and the average family size was 3.94. In the county, the population was spread out with 34.7% under the age of 18, 10.7% from 18 to 24, 27.1% from 25 to 44, 18.2% from 45 to 64, 9.3% who were 65 years of age or older. The median age was 28.3 years. For every 100 females there were 94.40 males. For every 100 females age 18 and over, there were 89.90 males. The median income for a household in the county was $30,134, the median income for a family was $31,760. Males had a median income of $22,635 versus $17,526 for females; the per capita income for the county was $12,130. About 32.60% of families and 35.80% of the population were below the poverty line, including 47.4% of those under age 18 and 29.8% of those age 65 or over. The county's per-capita income makes it one of the poorest counties in the United States. In 2009, it was tied with Bronx County, New York for "the greatest share of people receiving food stamps: 29 percent."Las Milpas unincorporated, was annexed by Pharr in 1987.
The United States Office of Management and Budget has designated Hidalgo County as the McAllen-Edinburg-Mission, TX Metropolitan Statistical Area. The United States Census Bureau ranked the McAllen-Edinburg-Mission, TX Metropolitan Statistical Area as the 70th most populous metropolitan statistical area of the United States as of July 1, 2012; the Office of Management and Budget has further designated the McAllen-Edinburg-Mission, TX Metropolitan Statistical Area as a component of the more extensive McAllen-Edinburg, TX Combined Statistical Area, the 60th most populous combined statistical area and the 67th most populous primary statistical area of the United States as of July 1, 2012. Hidalgo County tends to vote for the Democratic Party, although there is representation of the Republican Party in some of the offices that affect the county. Hidalgo County is represented by Vicente González of Texas's 15th congressional district, Henry Cuellar of Texas's 28th congressional district. In the 2012 presidential election, 70.4% of the voters voted for Barack Obama while 28.6% voted for Mitt Romney.
The last time Hidalgo County voted Republican was in the 1972 presidential election
United States Geological Survey
The United States Geological Survey is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, the natural hazards that threaten it; the organization has four major science disciplines, concerning biology, geography and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility; the USGS is a bureau of the United States Department of the Interior. The USGS employs 8,670 people and is headquartered in Reston, Virginia; the USGS has major offices near Lakewood, Colorado, at the Denver Federal Center, Menlo Park, California. The current motto of the USGS, in use since August 1997, is "science for a changing world." The agency's previous slogan, adopted on the occasion of its hundredth anniversary, was "Earth Science in the Public Service." Since 2012, the USGS science focus is directed at six topical "Mission Areas", namely Climate and Land Use Change, Core Science Systems, Ecosystems and Minerals and Environmental Health, Natural Hazards, Water.
In December 2012, the USGS split the Energy and Minerals and Environmental Health Mission Area resulting in seven topical Mission Areas, with the two new areas being: Energy and Minerals and Environmental Health. Administratively, it is divided into six Regional Units. Other specific programs include: Earthquake Hazards Program monitors earthquake activity worldwide; the National Earthquake Information Center in Golden, Colorado on the campus of the Colorado School of Mines detects the location and magnitude of global earthquakes. The USGS runs or supports several regional monitoring networks in the United States under the umbrella of the Advanced National Seismic System; the USGS informs authorities, emergency responders, the media, the public, both domestic and worldwide, about significant earthquakes. It maintains long-term archives of earthquake data for scientific and engineering research, it conducts and supports research on long-term seismic hazards. USGS has released the UCERF California earthquake forecast.
As of 2005, the agency is working to create a National Volcano Early Warning System by improving the instrumentation monitoring the 169 volcanoes in U. S. territory and by establishing methods for measuring the relative threats posed at each site. The USGS National Geomagnetism Program monitors the magnetic field at magnetic observatories and distributes magnetometer data in real time; the USGS collaborates with Canadian and Mexican government scientists, along with the Commission for Environmental Cooperation, to produce the North American Environmental Atlas, used to depict and track environmental issues for a continental perspective. The USGS operates the streamgaging network for the United States, with over 7400 streamgages. Real-time streamflow data are available online. National Climate Change and Wildlife Science Center implements partner-driven science to improve understanding of past and present land use change, develops relevant climate and land use forecasts, identifies lands and communities that are most vulnerable to adverse impacts of change from the local to global scale.
Since 1962, the Astrogeology Research Program has been involved in global and planetary exploration and mapping. In collaboration with Stanford University, the USGS operates the USGS-Stanford Ion Microprobe Laboratory, a world-class analytical facility for U--Pb geochronology and trace element analyses of minerals and other earth materials. USGS operates a number of water related programs, notably the National Streamflow Information Program and National Water-Quality Assessment Program. USGS Water data is publicly available from their National Water Information System database; the USGS operates the National Wildlife Health Center, whose mission is "to serve the nation and its natural resources by providing sound science and technical support, to disseminate information to promote science-based decisions affecting wildlife and ecosystem health. The NWHC provides information, technical assistance, research and leadership on national and international wildlife health issues." It is the agency responsible for surveillance of H5N1 avian influenza outbreaks in the United States.
The USGS runs 17 biological research centers in the United States, including the Patuxent Wildlife Research Center. The USGS is investigating collaboration with the social networking site Twitter to allow for more rapid construction of ShakeMaps; the USGS produces several national series of topographic maps which vary in scale and extent, with some wide gaps in coverage, notably the complete absence of 1:50,000 scale topographic maps or their equivalent. The largest and best-known topographic series is the 7.5-minute, 1:24,000 scale, quadrangle, a non-metric scale unique to the United States. Each of these maps covers an area bounded by two lines of latitude and two lines of longitude spaced 7.5 minutes apart. Nearly 57,000 individual maps in this series cover the 48 contiguous states, Hawaii, U. S. territories, areas of Alaska near Anchorage and Prudhoe Bay. The area covered by each map varies with the latitude of its represented location due to convergence of the meridians. At lower latitudes, near 30° north, a 7.5-minute quadrangle contains an area of about 64 square miles.
At 49° north latitude, 49 square miles are contained within a quadrangle of that size. As a unique non-metric map scale, the 1:24,000 scale requires a separate and specialized romer scale for pl
McAllen is the largest city in Hidalgo County, United States, the 22nd-most populous city in Texas. It is located at the southern tip of the state in the Rio Grande Valley; the city limits extend south to the Rio Grande, across from the Mexican city of Reynosa, McAllen is about 70 mi west of the Gulf of Mexico. As of 2017, McAllen’s population was estimated to be 142,696, it is the fifth-most populous metropolitan area in the state of Texas, the binational Reynosa–McAllen metropolitan area counts a population of nearly 1.52 million. From its settlement in 1904, the area around McAllen was rural and agricultural in character, but the latter half of the 20th century had steady growth, which the metropolitan area still experiences today; the introduction of the maquiladora economy and the North American Free Trade Association led to an increase in cross-border trading with Mexico. In 1904, the Hidalgo and San Miguel Extension of the St. Louis and Mexico Railway reached the Santa Anita Ranch. John McAllen and his son James donated land to the railroad to guarantee.
On December 5, 1904, the McAllen Townsite Company was formed by Uriah Lott, Leonidas C. Hill Sr. John McAllen, James Ballí McAllen, John J. Young; the new community, named for John McAllen, had the depot nearest the county seat, Hidalgo, 8 mi to the south. By 1911, 5,000 acres were under cultivation in East McAllen, with produce consisting of cotton, broom corn, citrus fruits and figs. East McAllen had an estimated population of 1,000 that year, West McAllen had ceased to exist. In 1911, the town was issued a charter of incorporation under the name McAllen. In 1916, 20,000 New York state troops were stationed at McAllen to help quell border disturbances; the resulting economic boom increased the population from 1,200 in 1916 to 6,000 in 1920. McAllen adopted a home rule charter in 1927. Canning factories, a winery, tortilla plants, wood-working plants, some oil exploration increased the population to 9,074 by 1930. In 1936, Hiram Garner opened the Valley Distillery, which produced wines from citrus juices.
The town was a petroleum and farm chemurgic center with a population of 11,877 in 1940, by which time it had adopted the nickname "The City of Palms". In 1941, a suspension bridge replaced the old bridge from Hidalgo to Reynosa in Tamaulipas, its construction resulted in increased tourist trade, making McAllen a winter resort and port of entry to Mexico. The discovery of oil in the Reynosa area in 1947 resulted in a large migration of people from the Mexican interior, constituting a new tourist market and cheap labor supply for McAllen; the sister cities were linked as a result of the increased traffic between them. The population of McAllen was 20,005 in 1950 and 32,728 in 1960; the McAllen–Hidalgo–Reynosa International Bridge was the number-two port of entry into Mexico in 1954. McAllen was an agricultural and tourist center in 1970, when the population reached 37,636. By the start of the 1970s, McAllen had a 200-bed hospital and a new air-conditioned high school, the first school in the nation featuring on-site power generated by natural gas-powered turbines.
The tourism industry continued to expand as people traveled to the area from both Mexico and the northern United States. The population continued to grow through the 1970s, reached 66,281 by 1980. During the late 1980s, the McAllen Foreign Trade Zone was an important general-purpose foreign trade zone. At the time, McAllen's main industries were retail and farming, each was in trouble; the devaluation of the Mexican peso in the 1980s put a damper on cross-border shopping. In 1983, a freeze took out much of the valley's citrus crop. In the mid-1980s, fueled by trade and the growth of the maquiladora, the economy began to improve in Hidalgo County. McAllen sits across the border from a large manufacturing center. After the peso devalued, coaxing companies to put their plants in Mexico with support operations in Texas became easier. President Trump held a briefing with the border agents at the patrol station here in January 2019 during the United States federal government shutdown of 2018–2019 over the Mexico–United States barrier.
The city has become a focal point for concerns about the border as border crossing is a daily event for many and is a key component in the local economy. Homeland Security Secretary Kirstjen Nielsen visited the Border Patrol station here in March 2019, she mentioned. The Marine Corps Commandant General Robert Neller had expressed concerns about the impact of border support on combat readiness for the troops. In order to deal with over crowded facilities in 2019 for asylum seekers, immigration authorities were releasing a few hundred people daily to private groups that assist them with basic needs and travel arrangements. After the U. S military troops placed razor wire coils at the border, the mayor emphasized how safe and secure the city is. Portions were removed by the city. U. S. military troops are prohibited from carrying out law enforcement duties. During border support activities, they are not allowed to seize drugs, they have assisted the Border Patrol by using military helicopters to carrying border patrol agents to and from locations along the Mexico–United States border and maintaining vehicles.
McAllen is located in southern Hidalgo County at 26°12′59″N 98
Population density is a measurement of population per unit area or unit volume. It is applied to living organisms, most of the time to humans, it is a key geographical term. In simple terms population density refers to the number of people living in an area per kilometer square. Population density is population divided by total land water volume, as appropriate. Low densities may lead to further reduced fertility; this is called the Allee effect after the scientist. Examples of the causes in low population densities include: Increased problems with locating sexual mates Increased inbreeding For humans, population density is the number of people per unit of area quoted per square kilometer or square mile; this may be calculated for a county, country, another territory or the entire world. The world's population is around 7,500,000,000 and Earth's total area is 510,000,000 square kilometers. Therefore, the worldwide human population density is around 7,500,000,000 ÷ 510,000,000 = 14.7 per km2. If only the Earth's land area of 150,000,000 km2 is taken into account human population density is 50 per km2.
This includes all continental and island land area, including Antarctica. If Antarctica is excluded population density rises to over 55 people per km2. However, over half of the Earth's land mass consists of areas inhospitable to human habitation, such as deserts and high mountains, population tends to cluster around seaports and fresh-water sources. Thus, this number by itself does not give any helpful measurement of human population density. Several of the most densely populated territories in the world are city-states and dependencies; these territories have a small area and a high urbanization level, with an economically specialized city population drawing on rural resources outside the area, illustrating the difference between high population density and overpopulation The potential to maintain the agricultural aspects of deserts is limited as there is not enough precipitation to support a sustainable land. The population in these areas are low. Therefore, cities in the Middle East, such as Dubai, have been increasing in population and infrastructure growth at a fast pace.
Cities with high population densities are, by some, considered to be overpopulated, though this will depend on factors like quality of housing and infrastructure and access to resources. Most of the most densely populated cities are in Southeast Asia, though Cairo and Lagos in Africa fall into this category. City population and area are, however dependent on the definition of "urban area" used: densities are invariably higher for the central city area than when suburban settlements and the intervening rural areas are included, as in the areas of agglomeration or metropolitan area, the latter sometimes including neighboring cities. For instance, Milwaukee has a greater population density when just the inner city is measured, the surrounding suburbs excluded. In comparison, based on a world population of seven billion, the world's inhabitants, as a loose crowd taking up ten square feet per person, would occupy a space a little larger than Delaware's land area; the Gaza Strip has a population density of 5,046 pop/km.
Although arithmetic density is the most common way of measuring population density, several other methods have been developed to provide a more accurate measure of population density over a specific area. Arithmetic density: The total number of people / area of land Physiological density: The total population / area of arable land Agricultural density: The total rural population / area of arable land Residential density: The number of people living in an urban area / area of residential land Urban density: The number of people inhabiting an urban area / total area of urban land Ecological optimum: The density of population that can be supported by the natural resources Demography Human geography Idealized population Optimum population Population genetics Population health Population momentum Population pyramid Rural transport problem Small population size Distance sampling List of population concern organizations List of countries by population density List of cities by population density List of city districts by population density List of English districts by population density List of European cities proper by population density List of United States cities by population density List of islands by population density List of U.
S. states by population density List of Australian suburbs by population density Selected Current and Historic City, Ward & Neighborhood Density Duncan Smith / UCL Centre for Advanced Spatial Analysis. "World Population Density". Exploratory map shows data from the Global Human Settlement Layer produced by the European Commission JRC and the CIESIN Columbia University