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About Ontario

City in Oregon, United States
1899Established
11,645Population
5.2 sq miArea
2,149 ftElevation

Ontario is the largest city in Malheur County, Oregon, United States. It lies along the Snake River at the Idaho border. The population was 11,645 at the 2020 census. The city is the largest community in the region of far eastern Oregon, also known as the Western Treasure Valley. Ontario is the principal city of the Ontario, OR-ID Micropolitan Statistical Area, which includes Malheur County in Oregon and Payette County in Idaho. Ontario is approximately halfway between Portland and Salt Lake City. It is the closest city to the Idaho border along Interstate 84. The city's slogan is "Where Oregon Begins".

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From Wikipedia, licensed CC BY-SA 4.0 · facts via Wikidata (CC0)

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The weekly

This week in Ontario

The forecast calls for Sunny, highs near 85°. In the local news, Ontario vs New Plymouth - Girls Junior Varsity Volleyball 09/16/2026 | Watch Live & On Demand (NFHS Network), Beyond the Ontario cabinet shuffle: The stakes for businesses (NATIONAL Public Relations), and NWS begins using ‘Lake America’ instead of Lake Ontario (Democrat and Chronicle).

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Boundary source: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Places_CouSub_ConCity_SubMCD/MapServer/18 · 2025-01-01