Pleasant Hill is a city in Contra Costa County, California, in the East Bay of the San Francisco Bay Area. The population was 32,837 at the 2000 census. It was incorporated in 1961. Pleasant Hill is the home of College Park High School, Diablo Valley College, John F Kennedy University, the central branch of the Contra Costa County Library system, and Pleasant Hill Recreation & Park District.
According to the United States Census Bureau, the city has a total area of 18.4 km² (7.1 mi²).
As of the census of 2000, there were 32,837 people, 13,753 households, and 8,403 families residing in the city. The population density was 1,788.2/km² (4,633.6/mi²). There were 14,034 housing units at an average density of 764.3/km² (1,980.3/mi²). The racial makeup of the city was 81.77% White, 1.53% Black or African American, 0.47% Native American, 9.43% Asian, 0.27% Pacific Islander, 2.32% from other races, and 4.19% from two or more races. 8.43% of the population were Hispanic or Latino of any race. There were 13,753 households out of which 28.0% had children under the age of 18 living with them, 48.4% were married couples living together, 9.1% had a female householder with no husband present, and 38.9% were non-families. 29.1% of all households were made up of individuals and 9.5% had someone living alone who was 65 years of age or older. The average household size was 2.35 and the average family size was 2.95.
In the city the population was spread out with 21.3% under the age of 18, 7.2% from 18 to 24, 32.4% from 25 to 44, 25.8% from 45 to 64, and 13.2% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 94.2 males. For every 100 females age 18 and over, there were 90.8 males.
According to a 2007 estimate, the median income for a household in the city was $80,737, and the median income for a family was $104,297. Males had a median income of $57,278 versus $42,013 for females. The per capita income for the city was $33,076. About 2.7% of families and 5.0% of the population were below the poverty line, including 3.2% of those under age 18 and 4.8% of those age 65 or over.
Pleasant Hill utilized a system of environmental planning at a relatively early stage of its modern growth. Notably the city authorized a study of hillside development in the 1980s that included detailed mapping of biota, geotechnical hazards, sound levels and other environmental constraints. These studies were used to establish appropriate zoning and development densities for all the principal undeveloped hillside areas within the city.