Clark County is a county located in the U.S. state of Nevada. The land area of Clark County is 8,061 square miles (20,880 km2), or roughly the size of New Jersey. As of the 2020 census, the population was 2,265,461. Most of the county population resides in the Las Vegas Census County Divisions, which has 2,196,623 people as of the 2020 Census. It is by far the most populous county in Nevada, and the 11th-most populous county in the United States. It covers 7% of the state's land area but holds 73% of the state's population, making Nevada the most centralized state in the United States.

Nevada is a landlocked state in the Western region of the United States. It borders Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. Nevada is the 7th-most extensive, the 32nd-most populous, and the 9th-least densely populated of the U.S. states. Nearly three-quarters of Nevada's people live in Clark County, which contains the Las Vegas–Paradise metropolitan area, including three of the state's four largest incorporated cities. Nevada's capital is Carson City. Las Vegas is the largest city in the state.