Contra Costa County CA Information


Contra Costa County Subdivisions

Contra Costa County CA Data & Demographics (As of July 1, 2018)


Total Population 1,143,447
Population in Households 1,132,905
Population in Familes 949,908
Population in Group Qrtrs 10,542
Population Density1 1,597
Diversity Index2 79


Median Household Income $91,102
Average Household Income $127,823
Per Capita Income $45,549


Total Housing Units 421,896 (100%)
Owner Occupied HU 267,112 (63.3%)
Renter Occupied HU 136,924 (32.5%)
Vacant Housing Units 17,860 ( 4.2%)
Median Home Value $604,823
Average Home Value $712,631


Total Households 404,036
Average Household Size 2.8
Family Households 285,598
Average Family Size 3
  1. Population Density = Total Population per square mile.
  2. 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 1.05% 1.03%
Households 0.9% 0.94%
Families 0.9% 0.94%
Median Household Income   3.05%
Per Capita Income   3.09%


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, 2018 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.