San Ysidro, San Clemente, San Mateo, San DIEGO, San Ramon, San Jose, San Simeon, and San Rafael are all cities in California. San Ysidro is a city in San DIEGO County, San Clemente is a city in Orange County, San Mateo is a city in San Mateo County, San DIEGO is a city in San DIEGO County, San Ramon is a city in Contra Costa County, San Jose is a city in Santa Clara County, San Simeon is a city in San Luis Obispo County, and San Rafael is a city in Marin County.