San Diego

San Diego (Spanish for Saint Didacus ) is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the MexicoUnited States border. With a 2020 population of 1, 386, 932, it is the eighth most populous city in the United States and the seat of San Diego County, the fifth most populous county in the United States, with 3, 286, 069 estimated residents as of 2021. The city is known for its mild yearround climate, natural deepwater harbor, extensive beaches and parks, long association with the United States Navy, and recent emergence as a healthcare and biotechnology development center. San Diego is the second largest city in the state of California after Los Angeles.