Contra Costa County Population 2018

Contra Costa County's estimated population is 1,147,439 with a growth rate of 0.77% in the past year according to the most recent United States census data. Contra Costa County is the 9th largest county in California.

Year Population Growth Growth Rate
20171,147,4398,7940.77%
20161,138,64512,6181.12%
20151,126,02715,0561.36%
20141,110,97115,6611.43%
20131,095,31016,2171.50%
20121,079,09312,9111.21%
20111,066,18213,3831.27%
20101,052,799249,06730.99%
1990803,732147,35222.45%
1980656,38097,99117.55%
1970558,389149,35936.52%
1960409,030110,04636.81%
1950298,984198,534197.64%
1940100,45021,84227.79%
193078,60824,71945.87%
192053,88922,21570.14%
191031,67413,62875.52%
190018,0464,53133.53%
189013,5159907.90%
188012,5254,06448.03%
18708,4613,13358.80%
18605,3280.00%

Contra Costa County Population Growth

Population Data via

Contra Costa County Race Data

Race Population Percentage
White753,15465.64%
Asian187,03916.30%
Black or African American107,5149.37%
Two or More Races57,7485.03%
American Indian and Alaska Native11,3030.99%
Native Hawaiian and Other Pacific Islander6,4730.56%

Contra Costa County Population Pyramid

0k10k20k30k40k Male Population0k10k20k30k40k Female Population8580757065605550454035302520151050
Data Sources
  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990