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San Bernardino is home to numerous diplomatic missions for the Inland Empire, being one of four cities in California with numerous consulates (the other three being Los Angeles, San Diego and San Francisco). San Bernardino is the 17th-largest city in California and the 100th-largest city in the United States. As one of the Inland Empire's anchor cities, San Bernardino spans 81 square miles (210 km 2) on the floor of the San Bernardino Valley and has a population of 209,924 as of the 2010 census. It serves as the county seat of San Bernardino County, California, United States. San Bernardino / ˈ s æ n ˌ b ɜːr n ɑːr ˈ d iː n oʊ / is a city located in the Riverside-San Bernardino metropolitan area (sometimes called the "Inland Empire"). They named the settlement after their home province of Ontario. 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. It is also the home of Ontario Mills and former home of the Ontario Motor Speedway. Ontario handles the mass of freight traffic between the ports of Los Angeles and Long Beach and the rest of the country. The city is home to the Ontario International Airport, which is the 15th busiest airport in the United States by cargo carried.
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As of the 2010 Census, the city had a population of 163,924, up from 158,007 at the 2000 census, making it the county's fourth most populous city after San Bernardino, Fontana, and Rancho Cucamonga. Located in the western part of the Inland Empire region, it lies just east of the Los Angeles county line and is part of the Greater Los Angeles Area. Ontario is a city located in southwestern San Bernardino County, California, United States, 35 miles (56 km) east of downtown Los Angeles. About Ontario, San Bernardino, and Fontana, California