Ontario, CA

Ontario is organized around three very different landscapes: the historic city along Euclid Avenue, an airport and industrial belt across the middle and east, and Ontario Ranch's developing neighborhoods in the south. Ontario International Airport places aviation and freight directly inside ordinary city geography. In 2025, it handled 7,116,735 passengers and 835,129 tons of freight and mail. Warehouses, manufacturing and assembly space, distribution facilities, hotels, the convention center, and Toyota Arena occupy districts around the airport, Interstate 10, and Interstate 15. The older downtown remains a civic and cultural center, while new housing and business parks continue across former agricultural land south of Riverside Drive. These sections differ sharply in age, street pattern, and daily activity. Euclid Avenue joins history with present-day community activity. The Ontario Museum of History & Art occupies a Works Progress Administration-era former City Hall on the parkway, across Lemon Avenue from the Chaffey Community Museum of Art.

Their exhibitions, classes, and events help define a growing downtown arts district. Fifteen murals created during the first O-Town Walls festival in October 2025 added contemporary work to downtown streets, and the two museums built a 2026 joint exhibition around mural art and neighborhood visual culture. Ontario-East Metrolink station serves the Riverside Line. The airport itself requires a separate connection: ONT Connect runs nonstop between Terminals 2 and 4 and Rancho Cucamonga station on Metrolink's San Bernardino Line. Euclid's median, museums, storefronts, and transit therefore serve a different center from the airport complex. The city began with an unusually deliberate town plan.

Canadian engineer George Chaffey and his brother William bought 6,218 acres with water rights in 1881 and opened Ontario Colony land sales in November 1882. Water brought from San Antonio Canyon supported oranges, lemons, peaches, walnuts, and grapes. Euclid Avenue became the colony's central work: an eight-mile, 200-foot-wide boulevard divided by a landscaped parkway. The brothers paired land with water access and promoted the settlement as a "Model Colony." Ontario incorporated in 1891. Aviation arrived at Latimer Field in 1923, and the field moved east as the city expanded. During the Second World War, the installation that became Ontario International Airport trained P-38 pilots, linking the agricultural colony to the aviation economy that now distinguishes it. Ontario Ranch represents another planned expansion.

The city's southern area covers about 8,200 acres of a former agricultural preserve used for dairy and cattle farming by Dutch, French Basque, Portuguese, Mexican, and other families. The preserve was divided among neighboring cities in 1999, and Ontario named its portion the New Model Colony before the Ontario Ranch name came into use. New homes, parks, retail sites, and business parks now occupy parts of that land, with substantial development still proceeding. Each new project forms a Mello-Roos community facilities district that levies a special tax to fund specified services and maintenance such as fire protection, parks, roads, lighting, and open space. That financing structure is a practical difference between many Ontario Ranch addresses and older neighborhoods north of Riverside Drive.