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5 days ago · Ontario, city, San Bernardino county, southern California, U.S. It is situated in the Riverside–San Bernardino portion of the consolidated Los Angeles metropolitan area on the site of the Spanish colonial Rancho Cucamonga.
About Ontario. Visit Ontario. Downtown Ontario. Ontario Convention & Visitors Bureau. Ontario International Airport. Ontario Mills. Toyota Arena. E-Newsletters. Sign Up to Receive our E-Newsletters. STAY CONNECTED. Stay informed with the latest updates. Emergency Notifications. @ReadyOntario. - A A + A.
Named by its founders for their native province in Canada, the onetime citrus community near the base of the towering San Gabriel Mountains in San Bernardino County has grown from its agricultural roots into a booming modern city with its own international airport.