Contra Costa County Demographic Quick Facts

2010 Population: 1,049,025

source: 2010 Decennial Census

2020 Census Data is anticipated to be published in late September, 2021.

2020 Countywide Population Estimate: 1,153,561
2020 Unincorporated County Population Estimate: 174,257

Source: California Department of Finance Demographic Research Unit

Explore Department of Finance Population Estimates for Cities, County, and the State

Population Characteristic Data

The Census Bureau's American Community Survey (ACS) provides detailed information about population characteristics. Explore Census ACS Data at
Learn More About ACS data - US Census Bureau's ACS Users Guide

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