
Ontario
- County:
- San Bernardino County
- County Seat:
- No
- Area (mi²):
- 49.984
- State:
- California
Ontario is a city located in San Bernardino County, California. Ontario has a 2025 population of 186,953. Ontario is currently growing at a rate of 1.22% annually and its population has increased by 6.4% since the most recent census, which recorded a population of 175,712 in 2020.
The average household income in Ontario is $102,089 with a poverty rate of 12.68%. The median age in Ontario is 33.1 years: 33 years for males, and 33.1 years for females.