Bakersfield is a city in and the county seat of Kern County, California, United States. It covers about 151 sq mi (390 km2) near the southern end of the San Joaquin Valley and the Central Valley region. Bakersfield’s population is around 380,000, making it the 9th-most populous city in California and the 52nd-most populous city in the United States of America. The Bakersfield–Delano Metropolitan Statistical Area, which includes all of Kern County, had a 2010 census population of 839,631, making it the 62nd-largest metropolitan area in the United States. The more built-up urban area that includes Bakersfield and areas immediately around the city, such as East Bakersfield, Oildale and Rosedale, has a population of over 520,000. Bakersfield is a charter city.