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Ontario, California population, 2010 to 2025

Ontario, California: 187,013 residents in 2025, up 13.8% since 2010. Explore Census city-limit population data.

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What the data shows

  • Ontario, California: 164K in 2010, 187K in 2025.

About this chart

With 187,013 residents in 2025, Ontario, California, ranked 143 among the US incorporated places in this Census dataset. Its city-limit count moved from 164,380 in 2010 to 187,013 in 2025. The largest annual change in the displayed series occurred in 2020: 5,937 fewer residents than the preceding estimate. That change coincides with the transition between Census vintages.

These figures measure Ontario within its Census incorporated-place boundaries, not the population of the surrounding metropolitan area. They are July 1 estimates, combining Vintage 2020 for 2010–2019 and Vintage 2025 for 2020 onward. City boundaries can change, and newer Census vintages revise estimates; a shift in this series cannot be attributed to migration alone. Consolidated-city balances exclude separately incorporated places. The table preserves exact resident counts, while the chart follows the annual sequence.

The data

Source: U.S. Census Bureau, city and town population estimates (Vintage 2020 for 2010–2019, Vintage 2025 for 2020–2025), incorporated places, July 1, people. Retrieved November 5, 2026. Census incorporated-place boundaries, not a metropolitan area. Boundary changes and revisions between Census vintages can affect comparisons. Consolidated city balances exclude separately incorporated places.

Ontario, California population, City-limit residents, 2010 to 2025, 2010–2025
DateOntario, California
2010164K
2011166K
2012167K
2013167K
2014168K
2015170K
2016172K
2017175K
2018179K
2019182K
2020176K
2021178K
2022181K
2023183K
2024186K
2025187K

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Frequently asked questions

What is the population of Ontario?

Ontario, California, had an estimated 187,013 residents on July 1, 2025, according to the Census Bureau. This is the city-limit population, not the metro area.

Is Ontario growing or shrinking?

Its city-limit count rose from 164,380 in 2010 to 187,013 in 2025, a 13.8% increase. The most recent year-to-year change was 1,344 more residents. Boundary changes and estimate revisions can affect comparisons.

How does Ontario rank by population?

It ranked 143 among US incorporated places in the 2025 estimates used here. This is a city-limit ranking; a metro-area ranking would use a different geographic unit.

Where does this data come from?

U.S. Census Bureau, city and town population estimates (Vintage 2020 for 2010–2019, Vintage 2025 for 2020–2025), incorporated places, July 1, people. Retrieved November 5, 2026. Census incorporated-place boundaries, not a metropolitan area. Boundary changes and revisions between Census vintages can affect comparisons. Consolidated city balances exclude separately incorporated places. You can download the full table as a CSV from this page.

Can I turn this chart into a video?

Yes. Open it in the editor, change the title, theme, colors or format (9:16 for Reels and TikTok, 16:9 for YouTube), and export an MP4. Free exports are 720p with a small watermark; Pro ($11.99/month) removes it and adds 1080p, 4K and 60 fps.

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