Ontario is the largest city in Malheur County, Oregon, United States. Government for the City of Ontario, Oregon providing fire, police, recreation, and public works services for city residents, businesses, and guests.
In the heart of treasure valley, on the borders of the Snake River, lies the City of Ontario. Ontario resides in the largest county in Oregon, Malheur County. With a population of over 11,500, it is the largest community in the far east region of Oregon. With proximity to countless outdoor activities, Ontario is the Gateway to Adventure.