Contra Costa County, California Basics:
Contra Costa County California - Government Site
Population: 1,078,257
Area: 716 square miles
County seat: Martinez
Area code(s) in use: 925 510
Time zone: PST
High school graduate or higher: 88.6%
Bachelor's degree or higher: 38.6%
Median household income: $78,187
Persons in poverty: 10.2%
Home ownership rate: 66.9%
Mean travel time to work: 32.8 minutes
Adjacent counties:
Alameda Marin Sacramento San Francisco San Joaquin San Mateo Santa Clara Solano