Health in Ontario, California: official figures
9.2% of residents of Ontario (16,506 people) had no health insurance in 2020-2024, 305th highest of 823 US cities of 50,000 or more (US: 8.4%; California: 6.6%).
How many children in Ontario are uninsured?
In Ontario, 4.6% of children under 19 and 12.3% of adults aged 19 to 64 were uninsured in 2020-2024, against 1.2% of those 65 and over (US: 5.5%, 11.7% and 0.8%).
Source: U.S. Census Bureau · saved copyHow many people in Ontario are on Medicaid?
29.1% of residents of Ontario under 65 had Medicaid or other means-tested public coverage as their only health insurance in 2020-2024, 127th highest of 823 US cities of 50,000 or more (US: 18.1%; California: 23.9%).
Source: U.S. Census Bureau · saved copyHow many people in Ontario have a disability?
10.0% of residents of Ontario (17,928 people) reported a disability in 2020-2024, 191st lowest of 823 US cities of 50,000 or more (US: 13.3%; California: 11.6%); 4.6% had two or more types of disability.
Source: U.S. Census Bureau · saved copyHow many older people in Ontario have a disability?
By age, 32.8% of residents of Ontario aged 65 and over, 8.6% of those aged 18 to 64 and 3.9% of children under 18 reported a disability in 2020-2024 (US: 32.9%, 10.9% and 4.9%).
Source: U.S. Census Bureau · saved copyWhat is the obesity rate in Ontario, California?
An estimated 33.5% of adults in Ontario had obesity in 2023, joint 385th highest of 810 US cities of 50,000 or more with an estimate (CDC PLACES model-based estimate for 2023, age-adjusted).
Source: Centers for Disease Control and Prevention · saved copyHow common is diabetes in Ontario?
An estimated 12.4% of adults in Ontario had been told by a doctor that they have diabetes, joint 203rd highest of 810 US cities of 50,000 or more with an estimate (CDC PLACES model-based estimate for 2023, age-adjusted).
Source: Centers for Disease Control and Prevention · saved copyHow is mental health in Ontario?
An estimated 17.4% of adults in Ontario reported poor mental health on 14 or more of the past 30 days, joint 386th lowest of 810 US cities of 50,000 or more with an estimate, and 18.8% had ever been told they have depression (CDC PLACES model-based estimate for 2023, age-adjusted).
Source: Centers for Disease Control and Prevention · saved copyHow many adults in Ontario have high blood pressure?
In Ontario, an estimated 31.1% of adults had high blood pressure and 28.1% did no physical activity outside work, joint 229th highest of 810 US cities of 50,000 or more with an estimate for physical inactivity (CDC PLACES model-based estimate for 2023, age-adjusted).
Source: Centers for Disease Control and Prevention · saved copyHow many adults in Ontario see a doctor for a check-up?
An estimated 69.1% of adults in Ontario had a routine check-up with a doctor in the past year, joint 42nd lowest of 810 US cities of 50,000 or more with an estimate (CDC PLACES model-based estimate for 2023, age-adjusted).
Source: Centers for Disease Control and Prevention · saved copyHow Ontario compares with other cities in the United States
Residents without health insurance (2020-2024)
Ontario ranks 305 of 823, highest first.
| Rank | City | Residents without health insurance |
|---|---|---|
| 302 | Omaha | 9.3% |
| 303 | Watsonville | 9.2% |
| 304 | Leander | 9.2% |
| 305 | Ontario | 9.2% |
| 306 | Anderson | 9.2% |
| 307 | Pembroke Pines | 9.1% |
| 308 | Cathedral City | 9.1% |
Residents with a disability (2020-2024)
Ontario ranks 633 of 823, highest first.
| Rank | City | Residents with a disability |
|---|---|---|
| 630 | Gilroy | 10.0% |
| 631 | Corona | 10.0% |
| 632 | Euless | 10.0% |
| 633 | Ontario | 10.0% |
| 634 | Grand Forks | 9.9% |
| 635 | Bothell | 9.9% |
| 636 | Rockwall | 9.9% |
Adults with obesity (age-adjusted model estimate) (2023)
Ontario ranks 386 of 810, highest first.
| Rank | City | Adults with obesity (age-adjusted model estimate) |
|---|---|---|
| 383 | Hanford | 33.6% |
| 384 | Ocoee | 33.6% |
| 385 | St. Paul | 33.5% |
| 386 | Ontario | 33.5% |
| 387 | Conroe | 33.5% |
| 388 | Clearwater | 33.5% |
| 389 | Murrieta | 33.5% |
Adults with diagnosed diabetes (age-adjusted model estimate) (2023)
Ontario ranks 205 of 810, highest first.
| Rank | City | Adults with diagnosed diabetes (age-adjusted model estimate) |
|---|---|---|
| 202 | Cleveland | 12.5% |
| 203 | Chicago | 12.4% |
| 204 | Atlanta | 12.4% |
| 205 | Ontario | 12.4% |
| 206 | Richmond | 12.4% |
| 207 | Yuma | 12.4% |
| 208 | Kalamazoo | 12.4% |
Adults who smoke cigarettes (age-adjusted model estimate) (2023)
Ontario ranks 463 of 810, highest first.
| Rank | City | Adults who smoke cigarettes (age-adjusted model estimate) |
|---|---|---|
| 460 | Oak Lawn | 12.1% |
| 461 | Los Angeles | 12.0% |
| 462 | Riverside | 12.0% |
| 463 | Ontario | 12.0% |
| 464 | Vallejo | 12.0% |
| 465 | Lee's Summit | 12.0% |
| 466 | Bayonne | 12.0% |
Adults with 14+ poor mental health days a month (age-adjusted model estimate) (2023)
Ontario ranks 414 of 810, highest first.
| Rank | City | Adults with 14+ poor mental health days a month (age-adjusted model estimate) |
|---|---|---|
| 411 | Huntington Beach | 17.4% |
| 412 | Fort Lauderdale | 17.4% |
| 413 | Glendale | 17.4% |
| 414 | Ontario | 17.4% |
| 415 | Pomona | 17.4% |
| 416 | Clovis | 17.4% |
| 417 | West Palm Beach | 17.4% |
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Sources
- U.S. Census Bureau: American Community Survey 2020-2024 5-year estimates, table C18108: Age by Number of Disabilities (Summary File rows for the US, the states and the listed cities, copied unchanged from the full file, sha256 8116247db31952c99ba053e6b0c767675a9674703b6b32e7705f1e4952f3b426), read 23 October 2026 · saved copy (SHA-256 b8f09efa878c…)
- U.S. Census Bureau: American Community Survey 2020-2024 5-year estimates, table B27010: Types of Health Insurance Coverage by Age (Summary File rows for the US, the states and the listed cities, copied unchanged from the full file, sha256 2ceba99dada3ec1042310e1dc1f00bcc819de765c3143028aa000df025012a69), read 23 October 2026 · saved copy (SHA-256 3db662ef4cb3…)
- Centers for Disease Control and Prevention: PLACES: Place Data (GIS Friendly Format), 2025 release: model-based age-adjusted prevalence among adults, for every place (data.cdc.gov API, columns used), read 23 October 2026 · saved copy (SHA-256 b2174bcc660f…)
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