Ontario, California

Ontario population, 2020 to 2024

Ontario added 9,562 residents from July 2020 to July 2024, a change of +5.4%. In the latest year it moved by +2,503. Among 429 California places of 5,000 or more, that growth ranks 38th; the median place changed by -1.1%. The median place of 5,000+ in California has 37,056 people, so Ontario is 5.0 times that size.

Ontario covers 49.98 square miles of land and 0.03 of water, for 3,707 people per square mile of land. The median California place of 5,000+ has 3,725, so Ontario is close to the typical town.

What county Ontario is in

All of Ontario's residents live in San Bernardino County, which had 2,214,281 residents in 2024. Ontario holds 8.4% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Ontario

3 ZIP Code Tabulation Areas (ZCTAs) overlap Ontario by at least 10% of the ZCTA's or the city's land: 91761, 91762, 91764. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where Ontario is

The Census internal point of Ontario is at 34.037600, -117.604400. Sacramento, the capital, is 381.1 miles NNW in a straight line. The nearest larger place is Fontana, CA (218,455 people), 9.5 miles away. The nearest city of 100,000 or more is Rancho Cucamonga, CA, 6.8 miles away. The ground at the internal point is about 261 m (856 ft) above sea level.

Daylight in Ontario

At 34.04° N, Ontario gets about 14 h 26 min of daylight around the June solstice and 9 h 53 min around the December solstice, a swing of 4 h 32 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026. Month-by-month sunrise and sunset times are on the Ontario daylight page.

Places near Ontario

The eight nearest incorporated places of 1,000+ in California, measured between internal points. The closest is Chino, 5.1 miles away, with 94,010 people.