Ontario Flag

Ontario

County Seat:
No
Area (mi²):
49.984
State:
California

Ontario is a city located in San Bernardino County, California. Ontario has a 2026 population of 185,285. Ontario is currently growing at a rate of 1.37% annually and its population has increased by 5.44% since the most recent census, which recorded a population of 175,723 in 2020.

185.3K
Total Population
3,707
Density (mi²)
2.5K 1.37%
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)