Clark County is the southernmost and most populous county in the U.S. state of Nevada, with 2,265,461 residents as of the 2020 census. The county is the location of the state's three largest cities, Las Vegas (the county seat), Henderson, and North Las Vegas, as well as the Las Vegas Strip, Nellis Air Force Base, and Hoover Dam. Clark County has 8,061 square miles (20,880 km) of land area, roughly the size of New Jersey.
Although the county has 70% of Nevada's population making it the 11th-most populous county in the United States, Clark County covers only 7% of Nevada's land mass. Despite having the name Las Vegas as part of their address, over 1 million residents live in unincorporated Clark County, with municipal services provided by the county. The county plays a role much larger than is typical in the US as it has direct jurisdiction over the Las Vegas Strip and such a large population.