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
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
Bedford County, Tennessee
Bedford County is a county located in the U. S. state of Tennessee. As of the 2010 census, the population was 45,058, its county seat is Shelbyville. Bedford County comprises the Shelbyville, TN Micropolitan Statistical Area, included in the Nashville-Davidson-Murfreesboro, TN Combined Statistical Area; the county was created in 1807 when the citizens of Rutherford County living south of the Duck River and the Stones River petitioned the governor to split Rutherford County in two. The new county was named after American Revolutionary War officer and large landowner in the area, Thomas Bedford. Once the state's largest and most populous county, Bedford County's size has been reduced since 1809 to form Coffee County, Moore County, Lincoln County, Marshall County; the county was pro-Confederate during the Civil War, but Shelbyville was loyal to the Union. Confederate general Nathan Bedford Forrest was born in 1821 in Chapel Hill and has no connection to naming of Bedford County, it was named after the Revolutionary War officer Thomas Bedford.
Texas pioneer William Whitaker Reed was born in Bedford County in 1816. According to the U. S. Census Bureau, the county has a total area of 475 square miles, of which 474 square miles is land and 1.2 square miles is water. Rutherford County Coffee County Moore County Lincoln County Marshall County Normandy Wildlife Management Area As of the census of 2000, there were 37,586 people, 13,905 households, 10,345 families residing in the county; the population density was 79 people per square mile. There were 14,990 housing units at an average density of 32 per square mile; the racial makeup of the county was 86.84% White, 11.48% Black or African American, 0.28% Native American, 0.45% Asian, 0.05% Pacific Islander, 2.73% from other races, 1.16% from two or more races. 7.48% of the population were Hispanic or Latino of any race. There were 13,905 households out of which 34.00% had children under the age of 18 living with them, 57.30% were married couples living together, 11.90% had a female householder with no husband present, 25.60% were non-families.
21.50% of all households were made up of individuals and 9.20% had someone living alone, 65 years of age or older. The average household size was 2.67 and the average family size was 3.06. In the county, the population was spread out with 25.80% under the age of 18, 9.90% from 18 to 24, 29.70% from 25 to 44, 22.00% from 45 to 64, 12.70% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 98.40 males. For every 100 females age 18 and over, there were 97.00 males. The median income for a household in the county was $36,729, the median income for a family was $33,691. Males had a median income of $25,485 versus $15,673 for females; the per capita income for the county was $13,698. About 12.70% of families and 25.10% of the population were below the poverty line, including 15.90% of those under age 18 and 17.80% of those age 65 or over. Shelbyville Bell Buckle Normandy Wartrace Unionville I-24 US-41 US-41A US-231 State Route 16 State Route 64 State Route 82 State Route 130 State Route 269 State Route 270 State Route 437 Bedford County School District operates nine elementary schools, three middle schools, three high schools, in Shelbyville and Unionville.
National Register of Historic Places listings in Bedford County, Tennessee Media related to Bedford County, Tennessee at Wikimedia Commons Geographic data related to Bedford County, Tennessee at OpenStreetMap Bedford County at Curlie Bedford County, TNGenWeb - free genealogy resources for the county Shelbyville Mainstreet
1930 United States Census
The Fifteenth United States Census, conducted by the Census Bureau one month from April 1, 1930, determined the resident population of the United States to be 122,775,046, an increase of 13.7 percent over the 106,021,537 persons enumerated during the 1920 Census. The 1930 Census collected the following information: address name relationship to head of family home owned or rented if owned, value of home if rented, monthly rent whether owned a radio set whether on a farm sex race age marital status and, if married, age at first marriage school attendance literacy birthplace of person, their parents if foreign born: language spoken at home before coming to the U. S. year of immigration whether naturalized ability to speak English occupation and class of worker whether at work previous day veteran status if Indian: whether of full or mixed blood tribal affiliationFull documentation for the 1930 census, including census forms and enumerator instructions, is available from the Integrated Public Use Microdata Series.
The original census enumeration sheets were microfilmed by the Census Bureau in 1949. The microfilmed census is located on 2,667 rolls of microfilm, available from the National Archives and Records Administration. Several organizations host images of the microfilmed census online, digital indices. Microdata from the 1930 census are available through the Integrated Public Use Microdata Series. Aggregate data for small areas, together with electronic boundary files, can be downloaded from the National Historical Geographic Information System. 1930 Census Questions Hosted at CensusFinder.com 1931 U. S Census Report Contains 1930 Census results Historic US Census data 1930Census.com: 1930 United States Census for Genealogy & Family History Research 1930 Interactive US Census Find stories and more attached to names on the 1930 US census
2010 United States Census
The 2010 United States Census is the twenty-third and most recent United States national census. National Census Day, the reference day used for the census, was April 1, 2010; the census was taken via mail-in citizen self-reporting, with enumerators serving to spot-check randomly selected neighborhoods and communities. As part of a drive to increase the count's accuracy, 635,000 temporary enumerators were hired; the population of the United States was counted as 308,745,538, a 9.7% increase from the 2000 Census. This was the first census in which all states recorded a population of over half a million, as well as the first in which all 100 largest cities recorded populations of over 200,000; as required by the United States Constitution, the U. S. census has been conducted every 10 years since 1790. The 2000 U. S. Census was the previous census completed. Participation in the U. S. Census is required by law in Title 13 of the United States Code. On January 25, 2010, Census Bureau Director Robert Groves inaugurated the 2010 Census enumeration by counting World War II veteran Clifton Jackson, a resident of Noorvik, Alaska.
More than 120 million census forms were delivered by the U. S. Post Office beginning March 15, 2010; the number of forms mailed out or hand-delivered by the Census Bureau was 134 million on April 1, 2010. Although the questionnaire used April 1, 2010 as the reference date as to where a person was living, an insert dated March 15, 2010 included the following printed in bold type: "Please complete and mail back the enclosed census form today." The 2010 Census national mail participation rate was 74%. From April through July 2010, census takers visited households that did not return a form, an operation called "non-response follow-up". In December 2010, the U. S. Census Bureau delivered population information to the U. S. President for apportionment, in March 2011, complete redistricting data was delivered to states. Identifiable information will be available in 2082; the Census Bureau did not use a long form for the 2010 Census. In several previous censuses, one in six households received this long form, which asked for detailed social and economic information.
The 2010 Census used only a short form asking ten basic questions: How many people were living or staying in this house, apartment, or mobile home on April 1, 2010? Were there any additional people staying here on April 1, 2010 that you did not include in Question 1? Mark all that apply: Is this house, apartment, or mobile home – What is your telephone number? What is Person 1's name? What is Person 1's sex? What is Person 1's age and Person 1's date of birth? Is Person 1 of Hispanic, Latino, or Spanish origin? What is Person 1's race? Does Person 1 sometimes live or stay somewhere else? The form included space to repeat all of these questions for up to twelve residents total. In contrast to the 2000 census, an Internet response option was not offered, nor was the form available for download. Detailed socioeconomic information collected during past censuses will continue to be collected through the American Community Survey; the survey provides data about communities in the United States on a 1-year or 3-year cycle, depending on the size of the community, rather than once every 10 years.
A small percentage of the population on a rotating basis will receive the survey each year, no household will receive it more than once every five years. In June 2009, the U. S. Census Bureau announced. However, the final form did not contain a separate "same-sex married couple" option; when noting the relationship between household members, same-sex couples who are married could mark their spouses as being "Husband or wife", the same response given by opposite-sex married couples. An "unmarried partner" option was available for couples; the 2010 census cost $13 billion $42 per capita. Operational costs were $5.4 billion under the $7 billion budget. In December 2010 the Government Accountability Office noted that the cost of conducting the census has doubled each decade since 1970. In a detailed 2004 report to Congress, the GAO called on the Census Bureau to address cost and design issues, at that time, had estimated the 2010 Census cost to be $11 billion. In August 2010, Commerce Secretary Gary Locke announced that the census operational costs came in under budget.
Locke credited the management practices of Census Bureau director Robert Groves, citing in particular the decision to buy additional advertising in locations where responses lagged, which improved the overall response rate. The agency has begun to rely more on questioning neighbors or other reliable third parties when a person could not be reached at home, which reduced the cost of follow-up visits. Census data for about 22% of U. S. househol
The United States of America known as the United States or America, is a country composed of 50 states, a federal district, five major self-governing territories, various possessions. At 3.8 million square miles, the United States is the world's third or fourth largest country by total area and is smaller than the entire continent of Europe's 3.9 million square miles. With a population of over 327 million people, the U. S. is the third most populous country. The capital is Washington, D. C. and the largest city by population is New York City. Forty-eight states and the capital's federal district are contiguous in North America between Canada and Mexico; the State of Alaska is in the northwest corner of North America, bordered by Canada to the east and across the Bering Strait from Russia to the west. The State of Hawaii is an archipelago in the mid-Pacific Ocean; the U. S. territories are scattered about the Pacific Ocean and the Caribbean Sea, stretching across nine official time zones. The diverse geography and wildlife of the United States make it one of the world's 17 megadiverse countries.
Paleo-Indians migrated from Siberia to the North American mainland at least 12,000 years ago. European colonization began in the 16th century; the United States emerged from the thirteen British colonies established along the East Coast. Numerous disputes between Great Britain and the colonies following the French and Indian War led to the American Revolution, which began in 1775, the subsequent Declaration of Independence in 1776; the war ended in 1783 with the United States becoming the first country to gain independence from a European power. The current constitution was adopted in 1788, with the first ten amendments, collectively named the Bill of Rights, being ratified in 1791 to guarantee many fundamental civil liberties; the United States embarked on a vigorous expansion across North America throughout the 19th century, acquiring new territories, displacing Native American tribes, admitting new states until it spanned the continent by 1848. During the second half of the 19th century, the Civil War led to the abolition of slavery.
By the end of the century, the United States had extended into the Pacific Ocean, its economy, driven in large part by the Industrial Revolution, began to soar. The Spanish–American War and World War I confirmed the country's status as a global military power; the United States emerged from World War II as a global superpower, the first country to develop nuclear weapons, the only country to use them in warfare, a permanent member of the United Nations Security Council. Sweeping civil rights legislation, notably the Civil Rights Act of 1964, the Voting Rights Act of 1965 and the Fair Housing Act of 1968, outlawed discrimination based on race or color. During the Cold War, the United States and the Soviet Union competed in the Space Race, culminating with the 1969 U. S. Moon landing; the end of the Cold War and the collapse of the Soviet Union in 1991 left the United States as the world's sole superpower. The United States is the world's oldest surviving federation, it is a representative democracy.
The United States is a founding member of the United Nations, World Bank, International Monetary Fund, Organization of American States, other international organizations. The United States is a developed country, with the world's largest economy by nominal GDP and second-largest economy by PPP, accounting for a quarter of global GDP; the U. S. economy is post-industrial, characterized by the dominance of services and knowledge-based activities, although the manufacturing sector remains the second-largest in the world. The United States is the world's largest importer and the second largest exporter of goods, by value. Although its population is only 4.3% of the world total, the U. S. holds 31% of the total wealth in the world, the largest share of global wealth concentrated in a single country. Despite wide income and wealth disparities, the United States continues to rank high in measures of socioeconomic performance, including average wage, human development, per capita GDP, worker productivity.
The United States is the foremost military power in the world, making up a third of global military spending, is a leading political and scientific force internationally. In 1507, the German cartographer Martin Waldseemüller produced a world map on which he named the lands of the Western Hemisphere America in honor of the Italian explorer and cartographer Amerigo Vespucci; the first documentary evidence of the phrase "United States of America" is from a letter dated January 2, 1776, written by Stephen Moylan, Esq. to George Washington's aide-de-camp and Muster-Master General of the Continental Army, Lt. Col. Joseph Reed. Moylan expressed his wish to go "with full and ample powers from the United States of America to Spain" to seek assistance in the revolutionary war effort; the first known publication of the phrase "United States of America" was in an anonymous essay in The Virginia Gazette newspaper in Williamsburg, Virginia, on April 6, 1776. The second draft of the Articles of Confederation, prepared by John Dickinson and completed by June 17, 1776, at the latest, declared "The name of this Confederation shall be the'United States of America'".
The final version of the Articles sent to the states for ratification in late 1777 contains the sentence "The Stile of this Confederacy shall be'The United States of America'". In June 1776, Thomas Jefferson wrote the phrase "UNITED STATES OF AMERICA" in all capitalized letters in the headline of his "original Rough draught" of the Declaration of Independence; this draft of the document did not surface unti
Dyer County, Tennessee
Dyer County is a county located in the westernmost part of the U. S. state of Tennessee. As of the 2010 census, the population was 38,335, its county seat is Dyersburg. Dyer County comprises TN Micropolitan Statistical Area. Dyer County was founded by a Private Act of Tennessee, passed on October 16, 1823; the area was part of the territory in Tennessee, legally occupied by Chickasaw Native American people. The county was named for Robert Henry Dyer. Dyer had been an army officer in the Creek War and War of 1812, a cavalry colonel in the First Seminole War of 1818 before becoming a state senator, he was instrumental in the formation of Madison County, Tennessee. On April 2, 2006 a severe weather system passed through Dyer County, producing tornadoes that killed 16 in the county and 24 in Tennessee. According to the U. S. Census Bureau, the county has a total area of 527 square miles, of which 512 square miles is land and 14 square miles is water; the county is drained by the Mississippi River. It is in the part of Tennessee called the "Mississippi bottomland".
Dyer County is bisected by U. S. Route 51, the older major highway connecting Memphis with Chicago from south to north; when upgraded to interstate standards, this road will become Interstate 69. To the west, Dyer County is connected to Missouri by Interstate 155 over the Mississippi River, providing the only highway connection, other than those at Memphis, between Tennessee and the states to the west of the river. Lake County Obion County Gibson County Crockett County Lauderdale County Mississippi County, Arkansas Pemiscot County, Missouri Bogota Wildlife Management Area Moss Island Wildlife Management Area Ernest Rice Wildlife Management Area Thorny Cypress Wildlife Management Area Tigrett Wildlife Management Area Tumbleweed Wildlife Management Area White Lake Refuge I-69 I-155 US 51 US 412 SR 77 SR 78 SR 89 SR 103 SR 104 SR 105 SR 181 SR 182 SR 210 SR 211 As of the census of 2000, there were 37,279 people, 14,751 households, 10,458 families residing in the county; the population density was 73 people per square mile.
There were 16,123 housing units at an average density of 32 per square mile. The racial makeup of the county was 85.40% White, 12.86% Black or African American, 0.22% Native American, 0.33% Asian, 0.02% Pacific Islander, 0.43% from other races, 0.73% from two or more races. 1.16% of the population were Hispanic or Latino of any race. There were 14,751 households out of which 32.90% had children under the age of 18 living with them, 53.20% were married couples living together, 13.60% had a female householder with no husband present, 29.10% were non-families. 25.30% of all households were made up of individuals and 10.70% had someone living alone, 65 years of age or older. The average household size was 2.49 and the average family size was 2.97. In the county, the age distribution of the population shows 25.70% under the age of 18, 8.70% from 18 to 24, 28.60% from 25 to 44, 23.50% from 45 to 64, 13.40% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 92.00 males.
For every 100 females age 18 and over, there were 88.80 males. The median income for a household in the county was $32,788, the median income for a family was $39,848. Males had a median income of $31,182 versus $21,605 for females; the per capita income for the county was $16,451. About 13.00% of families and 15.90% of the population were below the poverty line, including 21.00% of those under age 18 and 17.60% of those age 65 or over. Burks Broadcasting WASL-FM SL100: "Everything That Rocks" 50,000 watts covering 30 counties in Tennessee, Kentucky, Arkansas since 1969 City of License: Dyersburg, Tennessee 500-foot Tower Site: Lenox WTNV-FM / Eagle 97.3: "Today's Country & Your All-Time Favorites" 6,000 watts covering 40-45 mile radius of 10 counties in Tennessee, Missouri, & Kentucky since June 2007 City of License: Tiptonville, Tennessee 500-foot Tower Site: Elbridge AM1450 & 101.7FM / WTRO: "The Greatest Hits of All Time" 1,000 watts covering Dyer County & Northwest Tennessee since 1959 City of License: Dyersburg, Tennessee AM Tower Site: St John Avenue, Tennessee 100-foot Transmitter Site: Burks Place, Tennessee 300-foot Translator Site: Radio Road, Tennessee State Gazette – 5 days/week.
The paper has served Dyersburg and Northwest Tennessee since 1865. Bel Air Bruce Camelot Edinburgh Gardner Heights Lakewood Lattawoods Milltown Pill Hill Pioneer Southtown The Farms Twin Oaks Crowne Point Flower Valley Oakview National Register of Historic Places listings in Dyer County, Tennessee Dyersburg-Dyer County Chamber of Commerce Dyer County Schools Dyer County, TNGenWeb – genealogy resources Dyer County at Curlie