Pleasant Hill is a city in Contra Costa County, California, United States, in the East Bay of the San Francisco Bay Area. The population was 34,…Pleasant Hill is a city in Contra Costa County, California, United States, in the East Bay of the San Francisco Bay Area. The population was 34,613 at the 2020 census. It was incorporated in 1961. Pleasant Hill is the home of College Park High School, Diablo Valley College, the Pleasant Hill Library of the Contra Costa County Library system, and the Pleasant Hill Recreation & Park District.
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