Ontario Population 2026
Ontario has a population of 171,214, making it the #155 biggest city in 🇺🇸 United States, located in California. It is about 51× smaller than New York City, the country's biggest city.
Population (city proper)
171,214
Rank in United States
#155
Coordinates
34.06°N, 117.65°W
~306 m elevation · America/Los_Angeles
Distance to capital (Washington)
3,641 km
2,261 miles, straight line
Other big cities in California
| City | Population | Rank in United States |
|---|---|---|
| Los Angeles | 3,820,914 | #2 |
| San Diego | 1,404,452 | #8 |
| San Jose | 997,368 | #12 |
| San Francisco | 827,526 | #17 |
| Fresno | 542,107 | #34 |
| Sacramento | 524,943 | #35 |
| Long Beach | 474,140 | #41 |
| Oakland | 419,267 | #45 |
Cities near Ontario
- Rancho Cucamonga175,236 people · ~7 km away
- Fontana212,704 people · ~20 km away
- Corona164,226 people · ~22 km away
- Riverside317,261 people · ~26 km away
- San Bernardino216,108 people · ~34 km away
- Anaheim350,742 people · ~35 km away
FAQ
What is the population of Ontario?
Ontario has a population of 171,214 (city proper, latest official figure via GeoNames), making it the #155 biggest city in United States.
What state is Ontario in?
Ontario is located in California, United States.
Is Ontario the capital of United States?
No, the capital of United States is Washington D.C., about 3,641 km away.
Sources & notes
Population refers to the city proper (municipal boundaries), not the metropolitan area. Source: GeoNames (CC BY 4.0), retrieved 2026-07-07. Country data: UN World Population Prospects 2024.
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