San Diego County, California

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San Diego County ( ), officially the County of San Diego, is a southern county in the U.S. state of California, north to its border with Mexico. As of the 2020 census, the population was 3,298,634; it is the second-most populous county in California and the fifth-most populous in the United States. Its county seat is San Diego, the second-most populous city in California and the eighth-most populous in the United States. San Diego County is the southwesternmost county in the 48 contiguous United States, and is a border county. It is home to 18 Indian reservations, the most of any county in the U.S. There are 16 military installations of the United States Navy, Marine Corps, and Coast Guard in the county. San Diego County comprises the San Diego–Chula Vista–Carlsbad, CA Metropolitan Statistical Area, which is the 18th most populous metropolitan statistical area and the 18th most populous primary statistical area in the U.S. San Diego County is also part of the San Diego–Tijuana region, the...

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