San Mateo County CA Information


San Mateo County Subdivisions

San Mateo County CA Data & Demographics (As of July 1, 2017)


Total Population 763,610
Daytime Population: Workers 402,259
Daytime Population: Residents 365,269
Total Daytime Population (TDP) 767,528
Ratio TDP/Total Population1 1.01
Population in Households 754,757
Population in Familes 611,489
Population in Group Qrtrs 8,853
Population Density2 1,703
Diversity Index3 80


Median Household Income $97,025
Average Household Income $138,433
Per Capita Income $49,876


Total Housing Units 284,361 (100%)
Owner Occupied HU 157,684 (55.5%)
Renter Occupied HU 114,821 (40.4%)
Vacant Housing Units 11,856 ( 4.2%)
Median Home Value $849,143
Average Home Value $873,846


Total Households 272,505
Average Household Size 2.77
Family Households 185,546
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 0.84% 0.8%
Households 0.77% 0.76%
Families 0.76% 0.75%
Median Household Income   1.86%
Per Capita Income   2.24%


San Mateo County CA - Peer Comparisons by Rank and Percentile

The table below compares San Mateo 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 # 14 78th
Population Density # 5 93rd
Diversity Index # 20 67th
Median Household Income # 3 97th
Per Capita Income # 3 97th

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