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Ontario is a city in southwestern San Bernardino County, California, United States, 35 miles (56 km) east of downtown Los Angeles and 23 miles (37 km) west of downtown San Bernardino, the county seat. Located in the western part of the Inland Empire metropolitan area, it lies just east of Los Angeles County and is part of the Los Angeles metropolitan area. As of the 2020 census, the city had a population of 175,265.
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The city is home to Ontario International Airport, which is the 8th-busiest airport in the United States by cargo carried, as of 2026. Ontario handles the mass of freight traffic between the ports of Los Angeles and Long Beach and the rest of the country.
It takes its name from the Ontario Model Colony development established in 1882 by the Canadian engineer George Chaffey and his brothers, William Chaffey and Charles Chaffey. They named the settlement after their home province of Ontario, Canada's most populous province.
From the Wikipedia article Ontario, California, CC BY-SA 4.0.
Weather
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Forecast by Open-Meteo from national weather models. A forecast, not a measurement.
The past twelve months
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ERA5 reanalysis from Copernicus, via Open-Meteo. Modelled on a ~25 km grid, not measured at a station.
Air right now
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CAMS European and global air quality forecast, via Open-Meteo. Modelled on an 11–40 km grid; European AQI bands from the EEA.
Nearby on Wikipedia
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Articles with coordinates within 10 km, from English Wikipedia.
Towns around Ontario
- Upland3.8 km N
- Montclair3.9 km NW
- Chino6.7 km SW
- Rancho Cucamonga7.2 km NE
- Claremont7.3 km NW
- Pomona9.4 km W
- La Verne12 km W
- Chino Hills13 km SW
Straight-line distance and compass bearing from the town centre.