San Mateo Flag

San Mateo

County Seat:
No
Area (mi²):
12.134
State:
California

San Mateo is a city located in San Mateo County, California. San Mateo has a 2026 population of 103,006. San Mateo is currently growing at a rate of 0.89% annually but its population has decreased by -2.51% since the most recent census, which recorded a population of 105,658 in 2020.

103K
Total Population
8,489
Density (mi²)
908 0.89%
Growth

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)