Ontario is a city located in San Bernardino County, California

San Bernardino County, California

San Bernardino County is a county in the U.S. state of California. As of the 2010 census, the population was 2,035,210, up from 1,709,434 as of the 2000 census...

, United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

, 35 miles east of downtown Los Angeles. 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. As of the 2010 Census

United States Census, 2010

The Twenty-third United States Census, known as Census 2010 or the 2010 Census, is the current national census of the United States. National Census Day was April 1, 2010 and is the reference date used in enumerating individuals...

, the city had a population of 163,924, down from 170,373 at the 2000 census, making it the county's fourth most populous city after San Bernardino

San Bernardino, California

San Bernardino is a city located in the Riverside-San Bernardino metropolitan area , and serves as the county seat of San Bernardino County, California, United States...

, Fontana

Fontana, California

Fontana is a city of 196,069 residents in San Bernardino County, California. Founded in 1913, it remained essentially rural until World War II, when entrepreneur Henry J. Kaiser built a large steel mill in the area...

, and Rancho Cucamonga

Rancho Cucamonga, California

Rancho Cucamonga is a suburban city in San Bernardino County, California. As of the 2010 census, the city had a population of 165,269, up from 127,743 at the 2000 census. L. Dennis Michael was elected as Mayor on November 2, 2010. Jack Lam is the City Manager...

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The city is home to the LA/Ontario International Airport which is the 15th busiest cargo airport in the United States.