Photo: Originally uploaded by Rockero (Transferred by JaumeBG) · Public domainOn CDC estimates, Ontario as a whole is healthier than 46% of U.S. towns
Ontario differs from California on 13 of 32 measures CDC estimates: 1 better, 12 worse.
Modeled estimates for adults 18+, CDC’s own estimate for Ontario. How CDC estimates town health
What stands out about health in Ontario
Making ends meet is harder in Ontario
1 in 4 adults worry about having enough food (25.8%), vs 17.9% across California. Housing insecurity (20.9% vs 14.9%) and utility shut-off threats (9.9% vs 7.3%) are higher too. 22.2% of adults receive SNAP, vs 15.6% statewide. Everyday needs ↓
Ontario is behind on routine checkups
It trails California on four of five routine checkups and screenings: yearly checkups (68.3% vs 71.9%), dentist visits (53.8% vs 62.8%), cholesterol checks (82.7% vs 85.4%) and colon screening (51.9% vs 57.5%). Checkups ↓
1 in 6 working-age adults in Ontario has no health insurance
17% of adults 18–64 have no health insurance, vs 10.6% across California. Checkups ↓
Written from the CDC, Medicare and HRSA data on this page. CDC PLACES 2025 release: modeled estimates for adults, not counts; “higher” and “lower” mean the California figure falls outside Ontario’s likely range; at the ends of CDC’s ranges the grade could be anywhere from C− to B+.
What’s behind Ontario’s grade
On seven CDC estimates for adults, Ontario is healthier than 46% of U.S. towns, #559 of 847 in California. Smoking holds the grade up (fewer adults who smoke than 75% of U.S. towns); fair or poor health pulls it down (better than 11%).
Health estimates follow income closely across the country: towns with higher household incomes usually score higher (a correlation of 0.77 across 21,157 graded towns). Ontario’s median household income is $88,941; among the 10,079 U.S. towns within 25% of that ($67K–$111K), it’s healthier than 32%, so it sits below most towns with similar incomes, too.
Where Ontario compares well: cancer, other than skin cancer, 4.6% (U.S. 7.9%).
At 187,013 residents, Ontario is graded like any town, from one citywide estimate; its rank among the 395 U.S. cities over 100,000 is the fairer comparison.
Making ends meet
Needs that shape health as much as any doctor visit: food, housing, utilities and a way to get around.
22.2% of Ontario adults receive SNAP (food stamps), compared with 15.6% across California.
Keeping up with care
Share of Ontario adults getting routine care. The full ring is 100%; the dark tick marks California.
Out of every 100 Ontario adults…
Ontario runs below CA on 1 of 12 conditions and above it on 1. Tap one to see it as people.
Only 11% of Ontario residents are 65 or older, vs 16% across California. Cancer run low partly because the town is young.
Care in and near Ontario
4 community health centers in Ontario, plus the nearest just outside it.
Hospitals: Medicare overall star ratings, 1–5. Community health centers charge on a sliding scale by income. Distances are straight-line from the center of Ontario; ≈ marks a hospital located by its town, not its street. Shortage areas: HRSA Health Professional Shortage Areas (a “population” designation covers specific residents, such as those with low incomes).
Everyday habits, side by side with California
Share of adults, with the California figure marked.
15 miles of trails across 34 parks and preserves
How Ontario adults are doing
About the same as California on each measure.
2 in 5 Ontario adults feel lonely. A hello is a start.
Groups are the easiest way in: a walking group, a book club, your street.
If you or someone you know is struggling, call or text 988, the Suicide & Crisis Lifeline. It’s free, confidential and open 24/7.
Ontario and the towns around it
Ontario’s Health Grade ranks 6th of 6 graded towns around it.
Nearby towns are shaded from CDC’s estimates for their ZIP codes, or CDC’s own figure for cities and villages.
Health next door
Living with a disability
Shown without a better/worse judgment.
of Ontario adults live with a disability (California 30.4%). Thinking or memory is the most common.
Every CDC estimate for Ontario
Share of adults, 40 measures, with CDC’s likely range.
On the 32 measures below that have a better and a worse direction, Ontario is better than California on 1 and worse on 12; on the rest, the California figure falls inside Ontario’s likely range, so we call them about the same. Disability and SNAP are described, not compared as better or worse.
| Adults who… | Ontario | CA | U.S. | vs CA |
|---|---|---|---|---|
| Overall health | ||||
| Fair or poor health | 26.8%24.4–29.3 | 22.1% | 19.4% | Worse |
| Frequent physical distress (physical health not good 14+ days a month) | 14.5%13–16.1 | 13.4% | 13% | About the same |
| Frequent mental distress (mental health not good 14+ days a month) | 17.8%16–19.7 | 16.4% | 15.9% | About the same |
| Conditions | ||||
| Obesity | 33.6%29.3–37.9 | 27.8% | 32.9% | Worse |
| Diabetes | 12%10.6–13.4 | 11.7% | 12% | About the same |
| High blood pressure | 30%27.2–32.8 | 30.5% | 34.4% | About the same |
| High cholesterol (adults screened in 5 years) | 33%30–36.1 | 35.4% | 37.1% | About the same |
| Arthritis | 19.6%17.5–21.6 | 20.8% | 25.3% | About the same |
| Asthma | 9.7%8.6–10.8 | 9.3% | 9.9% | About the same |
| Cancer, other than skin cancer | 4.6%4.1–5 | 6.4% | 7.9% | Better |
| Coronary heart disease | 5.1%4.6–5.6 | 5.6% | 6.4% | About the same |
| COPD | 4.6%4.2–5.1 | 5.1% | 6.3% | About the same |
| Stroke | 2.9%2.7–3.1 | 3.1% | 3.4% | About the same |
| Lost all teeth (ages 65+) | 11.9%9.8–14.4 | 10.6% | 12.3% | About the same |
| Habits | ||||
| Smoke cigarettes | 12%10.6–13.6 | 10.9% | 11.8% | About the same |
| No exercise outside work | 27.6%24.4–30.9 | 24.6% | 24.7% | About the same |
| Binge drinking | 15.7%13.4–18.2 | 15.3% | 15.4% | About the same |
| Sleep under 7 hours | 38.5%34.3–43 | 35.1% | 36% | About the same |
| Checkups and coverage | ||||
| No health insurance (ages 18–64) | 17%15.2–19 | 10.6% | 11% | Worse |
| Checkup in the past year | 68.3%64.7–71.4 | 71.9% | 77.4% | Worse |
| Dentist visit in the past year | 53.8%50.6–57.1 | 62.8% | 63.2% | Worse |
| Cholesterol check in 5 years | 82.7%80.7–84.3 | 85.4% | 87.1% | Worse |
| Taking blood pressure medicine (adults with high blood pressure) | 66.6%63.4–69.5 | 71.3% | 76.5% | Worse |
| Colorectal cancer screening (ages 45–75) | 51.9%47.6–56.5 | 57.5% | 65.5% | Worse |
| Mammogram in 2 years (women 50–74) | 72.7%66.1–79 | 75.7% | 76.4% | About the same |
| Mind and connection | ||||
| Ever told they have depression | 19.2%16.7–21.7 | 20.1% | 20.6% | About the same |
| Feel lonely | 39.2%35.4–43.2 | 37.3% | 32.5% | About the same |
| Lack social and emotional support | 31.5%28.2–34.9 | 28.6% | 23.6% | About the same |
| Everyday needs | ||||
| Worried about having enough food | 25.8%23.2–28.3 | 17.9% | 15% | Worse |
| Worried about keeping housing | 20.9%18.7–23.2 | 14.9% | 12% | Worse |
| Threatened with a utility shut-off | 9.9%8.7–11.2 | 7.3% | 7.6% | Worse |
| Lack reliable transportation | 12.6%11.3–14 | 9.3% | 7.9% | Worse |
| Received SNAP (food stamps) | 22.2%20–24.4 | 15.6% | 11.6% | Higher |
| Disability | ||||
| Any disability | 31.7%28.6–34.9 | 30.4% | 30.1% | About the same |
| Difficulty walking or climbing stairs | 14%12.5–15.5 | 13.8% | 13.6% | About the same |
| Difficulty concentrating or remembering | 17.1%15.5–18.8 | 14.6% | 13.9% | Higher |
| Hearing difficulty | 5.3%4.7–5.9 | 5.9% | 6.7% | About the same |
| Vision difficulty | 7.3%6.7–7.9 | 5.6% | 5.4% | Higher |
| Difficulty doing errands alone | 9.1%8.2–10 | 8.1% | 7.9% | Higher |
| Difficulty dressing or bathing | 4.5%4.2–4.9 | 3.9% | 3.8% | Higher |
Each figure is the share of adults 18+ unless the label says otherwise; small numbers after it are CDC’s likely range (95% interval). “About the same” means the California figure falls inside that range.
Questions about health in Ontario
Is Ontario a healthy place to live?
On seven CDC estimates for adults, Ontario is healthier than 46% of U.S. towns: B− for health, #559 of 847 in California. Among U.S. towns with similar household incomes it’s healthier than 32%. These are modeled estimates of who lives there, not a measure of local care or habits alone.
What is the obesity rate in Ontario?
CDC estimates 33.6% of adults have obesity, likely between 29.3% and 37.9%, against 27.8% across California and 32.9% nationally.
What hospital is closest to Ontario?
Chino Valley Medical Center in Chino, 4.6 miles in a straight line from Ontario’s center point, is the nearest general hospital with an emergency room; Medicare rates it 4 of 5 stars.
How many people in Ontario have no health insurance?
CDC estimates 17% of adults ages 18–64 have no health insurance (likely 15.2–19%), against 10.6% across California.
How accurate are these numbers?
They’re modeled estimates: CDC applies national survey answers to each area’s age, sex, race and education mix, so they describe who lives in Ontario more than anything measured there. At the ends of CDC’s ranges the grade could be anywhere from C− to B+.
Neighbors talk health
Doctors taking patients, urgent care, staying active in Ontario.
Health estimates: CDC PLACES: Local Data for Better Health, 2025 release. The California figure combines its counties, weighted by adult population. Hospitals and star ratings: Medicare Care Compare (CMS). Health centers and shortage areas: HRSA. The Health Grade is our own summary of CDC’s estimates, not an official rating. Ages: U.S. Census Bureau, American Community Survey. Town boundaries: U.S. Census Bureau. This page isn’t medical advice. In an emergency, call 911.