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 33,152 at the 2010 census. It was incorporated in 1961. Pleasant Hill is the home of College Park High School, Diablo Valley College, John F Kennedy University, the Pleasant Hill Library and administration offices for the Contra Costa County Library system, and the Pleasant Hill Recreation & Park District.
The city hall of Pleasant Hill, completed in the late 20th century, has won several awards for architectural design.
For most of its history, Pleasant Hill did not have a true downtown or Main Street. In 1991, the city began planning the redevelopment of the area around the intersection of Monument and Contra Costa boulevards. In July 2000, Downtown Pleasant Hill finally opened. The privately owned and operated outdoor shopping center was designed to resemble a typical small Main Street.