 Most of the county population resides in the Las Vegas Census County Divisions, holding 1,771,945 people as of the 2010 Census, covering the 476 square miles (1,233 km2).It is by far the most populous county in Nevada, accounting for 7% of the state's land area but 74% of the state's population – thus making Nevada one of the most centralized states in the United States.Las Vegas, the state's most populous city, has been the county seat since its establishment.