
Ontario
- County:
- Richland County
- County Seat:
- No
- Area (mi²):
- 11.084
- State:
- Ohio
Ontario is a city located in Richland County, Ohio. Ontario has a 2025 population of 6,647. Ontario is currently declining at a rate of -0.05% annually and its population has decreased by -0.23% since the most recent census, which recorded a population of 6,662 in 2020.
The average household income in Ontario is $78,871 with a poverty rate of 7.94%. The median age in Ontario is 41.8 years: 37.6 years for males, and 48.2 years for females.