ONTARIO is a city in southwestern San Bernardino County in the U.S. state of California, 35 miles (56 km) east of downtown Los Angeles.

As of the 2020 Census, the city had a population of 175,265.
The city is home to the Ontario International Airport, which is the 15th-busiest airport in the United States by cargo carried. Ontario handles the mass of freight traffic between the ports of Los Angeles and Long Beach and the rest of the country.

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Welcome to Ontario.City – The site for all businesses, information, and important places in the City of ONTARIO, California.