
Ontario
- County:
- Malheur County
- County Seat:
- No
- Area (mi²):
- 5.948
- State:
- Oregon
Ontario is a city located in Malheur County, Oregon. Ontario has a 2025 population of 11,949. Ontario is currently growing at a rate of 0.35% annually and its population has increased by 1.77% since the most recent census, which recorded a population of 11,741 in 2020.
The average household income in Ontario is $62,079 with a poverty rate of 19.25%. The median age in Ontario is 35.4 years: 34.8 years for males, and 35.7 years for females.