San Bernardino is a city located in the Inland Empire region of Southern California in the United States. It serves as the county seat of San Bernardino County and functions as the economic, cultural, and political hub of the San Bernardino Valley.
According to the 2020 census, the city had a population of 222,101, ranking it as the 18th-most populous city in California. It shares its role as a primary hub for the wider Inland Empire with its twin city, Riverside. The broader Riverside–San Bernardino metropolitan area has a population of 4.74 million residents, making it the 12th-largest metropolitan area in the nation.