Contra Costa County CA Information


Contra Costa County Subdivisions

Contra Costa County CA Data & Demographics (As of July 1, 2017)


Total Population 1,135,585
Daytime Population: Workers 408,909
Daytime Population: Residents 602,083
Total Daytime Population (TDP) 1,010,992
Ratio TDP/Total Population1 0.89
Population in Households 1,124,801
Population in Familes 936,940
Population in Group Qrtrs 10,784
Population Density2 1,586
Diversity Index3 79


Median Household Income $86,132
Average Household Income $121,364
Per Capita Income $43,254


Total Housing Units 419,759 (100%)
Owner Occupied HU 262,360 (62.5%)
Renter Occupied HU 138,679 (33.0%)
Vacant Housing Units 18,720 ( 4.5%)
Median Home Value $553,462
Average Home Value $620,505


Total Households 401,039
Average Household Size 2.8
Family Households 283,346
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 1.1% 1.01%
Households 0.92% 0.9%
Families 0.91% 0.9%
Median Household Income   2.26%
Per Capita Income   2.17%


Contra Costa County CA - Peer Comparisons by Rank and Percentile

The table below compares Contra Costa County to the other 58 counties and county equivalents in California by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 9 86th
Population Density # 6 91st
Diversity Index # 21 66th
Median Household Income # 4 95th
Per Capita Income # 5 93rd

Additional comparisons and rankings can be made with a VERY EASY TO USE California Census Data Comparison Tool.