Union City Flag

Union City

County:
Alameda County
County Seat:
No
Area (mi²):
19.398
State:
California

Union City is a city located in Alameda County, California. Union City has a 2026 population of 66,196. Union City is currently declining at a rate of -0.02% annually and its population has decreased by -5.34% since the most recent census, which recorded a population of 69,933 in 2020.

66.2K
Total Population
3,413
Density (mi²)
-16 -0.02%
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)