The City of Ontario Elevates the quality-of-life by creating urban lifestyle districts that create sustainable places to live, work and play. Located just 35 miles east of downtown Los Angeles, the City of Ontario is ideally situated as a gateway to Southern California. With major freeways, rail transportation and International Airport, Ontario offers the rest of the world to be a part of a culturally diverse community with rich history that is well positioned for quality development and economic sustainability for its 177,000 residents.