ZIP code
95558
in Petrolia, CaliforniaPopulation 230
50.94/ 100
Ranked #14,944 of 32,066 US ZIPs (top 47%)
Ranked #1,007 of 1,719 California ZIPs (bottom 41%)
Ranks are modeled estimates — ZIPs a few hundred places apart are effectively tied.
What defines this ZIP
Metrics where this ZIP sits in the tails of the national distribution — the ones that most set it apart. Select any tile for its definition and methodology.
Humid extreme heat
0.3 days/year
in the bottom 0.3% nationally
Lower is healthier
ST1stUS1stDefinition & source ›
The average number of days per year when modeled heat stress — temperature, humidity, sun, and wind combined — reaches levels hard on the body outdoors.
Full methodology ›PFAS in drinking water
6.4%
in the bottom 2.6% nationally
Lower is healthier
ST4thUS3rdDefinition & source ›
The modeled probability that PFAS “forever chemicals” would be detected in untreated groundwater in this area, the source private wells draw on.
A modeled likelihood for untreated groundwater, the source drawn on by private wells, which are federally unregulated. It is not a measurement of treated water delivered by a public system, and it is not a test of any individual well.
Full methodology ›Walkability
1.2 intersections/sq mi
in the bottom 3.4% nationally
Higher is healthier
ST3rdUS3rdDefinition & source ›
The number of street intersections per square mile — a standard street-connectivity measure; denser networks correlate with more walkable neighborhoods.
Full methodology ›Natural-disaster risk
in the top 4.3% nationally
Lower is healthier
ST82ndUS96thDefinition & source ›
This area’s national rank on its single highest non-flood natural hazard — such as wildfire, tornado, or earthquake — in FEMA’s modeled National Risk Index; flooding is shown separately.
Full methodology ›Air-toxics cancer risk
18.5 per million
in the bottom 6.9% nationally
Lower is healthier
ST1stUS7thDefinition & source ›
The EPA’s modeled estimate of added lifetime cancer risk from breathing outdoor air toxics, in cases per million people exposed over a lifetime.
Full methodology ›Crowded housing
7.2%
in the top 8.1% nationally
Lower is healthier
ST65thUS92ndDefinition & source ›
The share of occupied homes with more than one person per room, the Census definition of crowded housing.
Full methodology ›Poverty rate
27.4%
in the top 8.6% nationally
Lower is healthier
ST92ndUS91stDefinition & source ›
The share of residents whose income is below the federal poverty line, from the Census Bureau’s American Community Survey.
Full methodology ›Distance to a nursing home
10.9 mi
in the top 9.4% nationally
Lower is healthier
ST88thUS91stDefinition & source ›
The distance in miles from this ZIP’s edge to the nearest Medicare- or Medicaid-certified nursing home.
Full methodology ›Industrial-pollution burden
in the bottom 9.6% nationally
Lower is healthier
ST18thUS10thDefinition & source ›
The EPA’s modeled screening score for industrial chemical releases, weighting the amounts released by their toxicity and how many people live nearby — a relative comparison score, not a measured exposure.
Full methodology ›Distance to a Superfund site
53 mi
in the top 11.1% nationally
Higher is healthier
ST97thUS89thDefinition & source ›
The distance in miles from this ZIP’s edge to the nearest Superfund site — an abandoned or uncontrolled hazardous-waste site the EPA has listed for cleanup.
Full methodology ›The read
Petrolia, California (ZIP 95558), overall, ranks in the top 47% healthiest ZIPs nationally (14,944th) and the bottom 41% of California (1,007th).
Reading the numbers as a whole, the picture lands somewhere in between: modeled humid heat sits in the bottom 0.3% nationally, pfas lands in the bottom 2.6% nationally, and air-toxics cancer risk lies in the bottom 6.9% nationally. Unemployment stands at the national minimum, shared with about 15% of ZIPs. Households without a vehicle rests at the national minimum, shared with about 16% of ZIPs. On the other side, walkability registers in the bottom 3.4% nationally, and modeled disaster risk resides in the top 4.3% nationally. Crowded housing settles in the top 8.1% nationally, and poverty is in the top 8.6% nationally. Distance to a nursing home sits in the top 9.4% nationally.
Defined simply, pfas is the man-made "forever chemicals" that build up in the body and environment instead of breaking down; here a modeled estimate of the chance a private well contains them. Disaster risk is the area's national rank on its highest non-flood peril in FEMA's modeled Risk Index, like wildfire or quake. Air-toxics cancer risk is a modeled EPA estimate of added lifetime cancer risk from breathing outdoor air, per million people. ZIP 95547, about 7.7 miles away, comes out healthier overall.
What’s driving this score
Nine domains make up the ZipVitals Score — here is how this ZIP does on each, and how much each one counts.
Compared with the ZIP codes measured across all nine scoring domains — not with all US ZIP codes.
Lifting this score
Environmental Hazard
in the top 1.0%
14%
Climate / Disaster Risk
healthier than 97%
5%
About typical
Chronic Disease Burden
healthier than 49%
21%
Preventive Care
healthier than 45%
13%
Risk Behavior
healthier than 59%
11%
Holding it back
Social Need / SDOH
healthier than 36%
16%
Mental Health
healthier than 22%
8%
Disability
healthier than 38%
7%
Healthcare Access
healthier than 24%
5%
Lifting this score
Environmental Hazard
in the top 0.4%
14%
Preventive Care
healthier than 66%
13%
Climate / Disaster Risk
healthier than 94%
5%
Holding it back
Chronic Disease Burden
healthier than 19%
21%
Social Need / SDOH
healthier than 39%
16%
Risk Behavior
healthier than 34%
11%
Mental Health
healthier than 12%
8%
Disability
healthier than 36%
7%
Healthcare Access
healthier than 15%
5%
“Share” is how much of this ZIP’s score the domain accounts for. Percentages are rounded; higher is healthier in every domain. How the score works, and who it compares you with ›
Nearby & similar ZIPs
Editorially selected — see how this ZIP compares to nearby and similar places.
Nearby
95536
Californiashares a border
Score 49.90
Closest healthier
95547
Californiaabout 7.7 mi away
Score 51.95
Similar health profile
03470
New Hampshire93% similar profile
Score 49.16
How these were chosen: only ZIPs with a published Score appear — a nearby ZIP with too little data to score won’t. Nearby means closest by distance between ZIP boundaries, which can cross state lines. A similar health profile is a close match across the nine Score domains, not similar demographics. Distances are measured between ZIP boundaries — ZIPs that touch share a border. How distance is measured
Evidence
Every measure this page draws on, by source. Collapsed by default — the full data stays in the page for search engines either way.
Health OutcomesCDC PLACES 2022 / 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Arthritis among adults | 29.9% | 26.5–33.3 |
| High blood pressure among adults | 37.0% | 32.9–41.0 |
| Cancer (non-skin) or melanoma among adults | 10.4% | 9.4–11.5 |
| Current asthma among adults | 10.8% | 9.6–12.1 |
| Coronary heart disease among adults | 8.2% | 7.1–9.5 |
| Chronic obstructive pulmonary disease among adults | 8.6% | 7.0–10.4 |
| Depression among adults | 25.5% | 22.1–29.2 |
| Diagnosed diabetes among adults | 12.5% | 10.6–14.5 |
| High cholesterol among adults who have ever been screened | 38.7% | 34.7–42.8 |
| Obesity among adults | 32.6% | 26.2–39.6 |
| Stroke among adults | 4.2% | 3.6–4.9 |
| All teeth lost among adults aged >=65 years | 7.9% | 6.2–9.8 |
PreventionCDC PLACES 2022 / 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Current lack of health insurance among adults aged 18-64 years | 6.8% | 5.3–8.6 |
| Taking medicine to control high blood pressure among adults with high blood pressure | 75.4% | 72.1–78.4 |
| Visits to doctor for routine checkup within the past year among adults | 73.8% | 70.0–77.4 |
| Cholesterol screening among adults | 87.1% | 85.1–88.9 |
| Colorectal cancer screening among adults aged 45–75 years | 65.2% | 59.9–70.0 |
| Visited dentist or dental clinic in the past year among adults | 62.6% | 58.7–66.0 |
| Mammography use among women aged 50-74 years | 77.3% | 69.6–83.5 |
Health Risk BehaviorsCDC PLACES 2022 / 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Binge drinking among adults | 16.6% | 13.9–19.7 |
| Current cigarette smoking among adults | 15.5% | 12.5–18.9 |
| No leisure-time physical activity among adults | 24.1% | 19.5–29.0 |
| Short sleep duration among adults | 33.9% | 27.9–40.3 |
Health StatusCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Fair or poor self-rated health status among adults | 22.7% | 19.1–26.8 |
| Frequent mental distress among adults | 18.6% | 16.3–21.0 |
| Frequent physical distress among adults | 15.7% | 13.6–18.1 |
DisabilityCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Cognitive disability among adults | 15.5% | 13.2–18.0 |
| Any disability among adults | 34.3% | 29.3–39.4 |
| Hearing disability among adults | 8.4% | 7.3–9.5 |
| Independent living disability among adults | 9.4% | 8.0–11.1 |
| Mobility disability among adults | 17.0% | 14.2–20.0 |
| Self-care disability among adults | 4.5% | 3.8–5.3 |
| Vision disability among adults | 5.4% | 4.6–6.3 |
Health-Related Social NeedsCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Lack of social and emotional support among adults | 24.7% | 20.9–28.8 |
| Food insecurity in the past 12 months among adults | 14.4% | 11.7–17.7 |
| Received food stamps in the past 12 months among adults | 15.6% | 12.4–19.2 |
| Housing insecurity in the past 12 months among adults | 11.9% | 9.8–14.3 |
| Lack of reliable transportation in the past 12 months among adults | 8.2% | 6.9–9.6 |
| Loneliness among adults | 32.0% | 27.2–37.5 |
| Utility services shut-off threat in the past 12 months among adults | 7.3% | 6.1–8.6 |
Community & economyCensus ACS 5-Year · 2024 release · observed
| Measure | Value | US median (p10–p90) | CA median (p10–p90) |
|---|---|---|---|
| Poverty rate | 27.4% | 10.6% (3.1–25.8%) n=32,364 | 10.6% (4.1–24.9%) n=1,714 |
| Uninsured 18–64 | 3.5% | 9.0% (1.5–24.3%) n=32,286 | 7.7% (1.7–17.9%) n=1,704 |
| No HS diploma (25+) | 0.0% | 7.9% (1.8–20.7%) n=32,505 | 9.8% (1.4–30.9%) n=1,729 |
| Bachelor's or higher (25+) | 24.6% | 23.3% (9.2–53.6%) n=32,505 | 31.3% (9.9–68.2%) n=1,729 |
| Unemployment rate (16+) | 0.0% | 3.9% (0.0–9.8%) n=32,274 | 6.1% (0.8–12.0%) n=1,714 |
| Households without a vehicle | 0.0% | 3.9% (0.0–12.5%) n=32,322 | 4.5% (0.0–12.2%) n=1,708 |
| Broadband subscription | 80.0% | 89.3% (75.1–97.1%) n=32,322 | 93.4% (82.1–98.4%) n=1,708 |
| Housing cost burden (≥30% income) | 24.0% | 23.7% (10.6–40.0%) n=32,322 | 38.6% (24.4–50.5%) n=1,708 |
| Homeownership rate | 69.6% | 78.7% (51.7–94.0%) n=32,322 | 64.1% (31.9–86.4%) n=1,708 |
| Crowded housing (>1 per room) | 7.2% | 1.3% (0.0–6.3%) n=32,322 | 4.8% (0.0–15.9%) n=1,708 |
| Foreign-born population | 6.5% | 2.6% (0.0–18.6%) n=32,553 | 18.9% (3.0–40.4%) n=1,730 |
| Single-parent households | 47.8% | 53.6% (37.3–74.1%) n=32,087 | 48.4% (35.1–72.3%) n=1,692 |
| Population 65+ | 36.5% | 19.4% (10.8–33.6%) n=32,553 | 17.0% (9.7–35.7%) n=1,730 |
| Median age | 50.6 yr | 42.2 yr (33.0–56.3) n=32,292 | 40.1 yr (31.8–57.0) n=1,712 |
| Median household income | $51,719 | $72,070 ($46,039–$118,707) n=30,318 | $93,448 ($54,188–$159,562) n=1,584 |
| Median home value | $566,200 | $222,200 ($100,300–$579,820) n=30,049 | $659,800 ($300,520–$1,493,340) n=1,593 |
| Median gross rent | — | $1,021 ($677–$1,912) n=25,670 | $1,912 ($1,113–$2,923) n=1,461 |
Life expectancyNCHS / RWJF USALEEP · model-based
| Measure | Value | US median (p10–p90) | CA median (p10–p90) |
|---|---|---|---|
| Life expectancy at birth | 84.1 yr ± 1.93 | 78.9 yr (74.7–82.8) n=31,308 | 80.5 yr (76.7–83.8) n=1,665 |
About the ± — it’s this estimate’s give-or-take (statisticians call it the standard error). The true life expectancy for this ZIP most likely falls within 1.93 years of 84.1, and it’s very unlikely to be off by more than twice that.
More ZIPs to explore ▾More ZIPs to explore ▴
How these lists were built: they draw only from ZIPs that have a published Score, so ZIPs with too little data to score are not listed. Distance-based lists use distance between ZIP boundaries with no state filter, so an out-of-state ZIP can appear. Statistically similar means a close match across the nine Score domains, not a demographic match: the measure is the cosine similarity between two ZIPs’ domain scores, taken over the domains both ZIPs have data for and only where that overlap covers at least six of the nine — and where no ZIP clears that minimum-overlap floor, that list is left out rather than filled with a weak match. How distance is measured