Ontario, California

Ontario is a city in southwestern San Bernardino County, California, in the United States. It lies about 35 miles (56 km) east of downtown Los Angeles and about 23 miles (37 km) west of San Bernardino, the county seat, in the western part of the Inland Empire. It sits just east of Los Angeles County and belongs to the wider Los Angeles metropolitan area. The 2020 census counted 175,265 residents. The city is home to Ontario International Airport, which handled the eighth-largest volume of air cargo in the United States as of 2026, and which moves much of the freight travelling between the ports of Los Angeles and Long Beach and the rest of the country. Its name comes from the Ontario Model Colony, a development established in 1882 by the Canadian engineer George Chaffey and his brothers William and Charles, who named the settlement after their home province of Ontario.