ZIP code
94548
in Knightsen, CaliforniaPopulation 832
55.03/ 100
Ranked #9,406 of 32,066 US ZIPs (top 29%)
Ranked #772 of 1,719 California ZIPs (top 45%)
Ranked #153 of 174 San Francisco-Oakland-Fremont, CA ZIPs (bottom 12.1%)
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.
Median household income
$189,653
in the top 1.4% nationally
Higher is healthier
ST94thUS99thDefinition & source ›
The middle household income in this ZIP — half of households earn more, half earn less — in dollars per year.
Full methodology ›Homeownership rate
100%
at the national maximum
Higher is healthier
ST99thUS99thDefinition & source ›
The share of occupied homes that are owned, rather than rented, by the people living in them.
Full methodology ›Crowded housing
13.1%
in the top 2.8% nationally
Lower is healthier
ST85thUS97thDefinition & source ›
The share of occupied homes with more than one person per room, the Census definition of crowded housing.
Full methodology ›Unemployment rate
14.4%
in the top 4.1% nationally
Lower is healthier
ST93rdUS96thDefinition & source ›
The share of the civilian labor force that is unemployed.
Full methodology ›Transportation noise
15.1%
in the top 4.3% nationally
Lower is healthier
ST89thUS96thDefinition & source ›
The modeled share of residents exposed to average road, rail, and aviation noise at or above 55 decibels — a noticeable background presence.
Full methodology ›Arsenic in groundwater
25.5%
in the top 4.3% nationally
Lower is healthier
ST96thUS96thDefinition & source ›
The modeled probability that untreated groundwater in this area — the source private wells draw on — exceeds the federal arsenic limit of 10 micrograms per liter.
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 ›Tree cover
0.00%
at the national minimum
Higher is healthier
ST1stUS1stDefinition & source ›
The share of this ZIP’s land area covered by forest.
Full methodology ›Outer-floodplain exposure
6.0%
in the top 6.3% nationally
Lower is healthier
ST85thUS94thDefinition & source ›
The share of this ZIP’s land area inside FEMA’s 0.2%-annual-chance flood band — the “500-year” zone, a lower but real 1-in-500 yearly chance.
Measured from FEMA’s mapped flood panels. Where a panel has not been mapped, no value is published for that ZIP — those ZIPs are absent from this comparison rather than counted as unexposed.
Full methodology ›Households without a vehicle
14.7%
in the top 7.6% nationally
Lower is healthier
ST93rdUS92ndDefinition & source ›
The share of households with no vehicle available.
Full methodology ›Distance to an emergency room
17.5 mi
in the top 7.7% nationally
Lower is healthier
ST93rdUS92ndDefinition & source ›
The distance in miles from this ZIP’s edge to the nearest Medicare-certified hospital with an emergency room.
Full methodology ›Cross-source signals
Combined exposures in this ZIP
More than one environmental exposure stands out in this ZIP. Each is established independently and shown on its own above; they are grouped here for context — not because one causes the other.
This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.
See the full flooding, evacuation & humid-heat analysis →
The read
On balance, and by the composite measure, Knightsen, California (ZIP 94548) ranks in the top 29% healthiest ZIPs nationally (9,406th) and the top 45% of California (772nd).
Strengths and concerns sit side by side across the measures here: household income settles in the top 1.4% nationally, and homeownership lies at the national maximum. On the other hand, crowded housing resides in the top 2.8% nationally, and unemployment lands in the top 4.1% nationally. Modeled transportation noise registers in the top 4.3% nationally, arsenic sits in the top 4.3% nationally, and tree cover rests at the national minimum. Outer-floodplain exposure is in the top 6.3% nationally, households without a vehicle stands in the top 7.6% nationally, and distance to an emergency room settles in the top 7.7% nationally.
Compared with the ZIPs it borders, outer-floodplain exposure runs far higher than the surrounding ZIPs on this measure. In plainer terms, arsenic is a natural groundwater contaminant, here a modeled estimate of the chance private-well levels exceed a benchmark. Transportation noise is the modeled share of an area exposed to average road, rail, and air noise at or above 55 decibels. Outer-floodplain exposure is land with a lower but real 1-in-500 chance of flooding each year, nicknamed the "500-year floodplain". For a healthier nearby ZIP overall, look to ZIP 94513, just across the boundary.
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. Compare it against the US, this state and the San Francisco-Oakland-Fremont, CA metro area.
Compared with the ZIP codes measured across all nine scoring domains — not with all US ZIP codes.
Lifting this score
Chronic Disease Burden
healthier than 78%
21%
Risk Behavior
healthier than 76%
11%
Mental Health
healthier than 74%
8%
Disability
healthier than 66%
7%
About typical
Social Need / SDOH
healthier than 57%
16%
Holding it back
Environmental Hazard
healthier than 29%
14%
Preventive Care
healthier than 40%
13%
Climate / Disaster Risk
healthier than 11%
5%
Healthcare Access
healthier than 39%
5%
Lifting this score
Environmental Hazard
healthier than 60%
14%
Preventive Care
healthier than 62%
13%
Mental Health
healthier than 70%
8%
Disability
healthier than 61%
7%
About typical
Chronic Disease Burden
healthier than 45%
21%
Social Need / SDOH
healthier than 55%
16%
Risk Behavior
healthier than 54%
11%
Holding it back
Climate / Disaster Risk
healthier than 10%
5%
Healthcare Access
healthier than 24%
5%
Nothing measured is lifting this score.
About typical
Preventive Care
healthier than 43%
13%
Holding it back
Chronic Disease Burden
healthier than 12%
21%
Social Need / SDOH
healthier than 14%
16%
Environmental Hazard
healthier than 23%
14%
Risk Behavior
healthier than 22%
11%
Mental Health
healthier than 32%
8%
Disability
healthier than 16%
7%
Climate / Disaster Risk
healthier than 5%
5%
Healthcare Access
healthier than 8%
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
94513
Californiashares a border
Score 59.16
Closest healthier
95219
Californiaabout 2.0 mi away
Score 55.48
Similar health profile
95835
California99% similar profile
Score 60.37
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 | 24.9% | 22.1–27.8 |
| High blood pressure among adults | 33.0% | 29.6–36.4 |
| Cancer (non-skin) or melanoma among adults | 8.6% | 7.7–9.5 |
| Current asthma among adults | 9.6% | 8.5–10.9 |
| Coronary heart disease among adults | 6.6% | 5.8–7.6 |
| Chronic obstructive pulmonary disease among adults | 5.6% | 4.4–6.9 |
| Depression among adults | 20.7% | 17.9–23.8 |
| Diagnosed diabetes among adults | 11.7% | 10.1–13.6 |
| High cholesterol among adults who have ever been screened | 37.8% | 34.3–41.4 |
| Obesity among adults | 30.4% | 25.6–35.4 |
| Stroke among adults | 3.3% | 2.9–3.8 |
| All teeth lost among adults aged >=65 years | 6.2% | 4.9–7.7 |
PreventionCDC PLACES 2022 / 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Current lack of health insurance among adults aged 18-64 years | 8.5% | 6.4–11.0 |
| Taking medicine to control high blood pressure among adults with high blood pressure | 73.8% | 70.3–77.1 |
| Visits to doctor for routine checkup within the past year among adults | 72.7% | 69.0–76.0 |
| Cholesterol screening among adults | 88.1% | 86.0–90.0 |
| Colorectal cancer screening among adults aged 45–75 years | 67.7% | 63.4–71.9 |
| Visited dentist or dental clinic in the past year among adults | 64.3% | 61.0–67.4 |
| Mammography use among women aged 50-74 years | 74.9% | 67.6–81.3 |
Health Risk BehaviorsCDC PLACES 2022 / 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Binge drinking among adults | 16.5% | 13.9–19.3 |
| Current cigarette smoking among adults | 10.0% | 7.8–12.7 |
| No leisure-time physical activity among adults | 23.9% | 19.9–28.2 |
| Short sleep duration among adults | 34.2% | 29.6–39.0 |
Health StatusCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Fair or poor self-rated health status among adults | 20.1% | 16.7–23.7 |
| Frequent mental distress among adults | 15.8% | 13.8–18.0 |
| Frequent physical distress among adults | 13.7% | 11.7–15.9 |
DisabilityCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Cognitive disability among adults | 13.1% | 11.0–15.3 |
| Any disability among adults | 29.9% | 25.8–34.2 |
| Hearing disability among adults | 7.2% | 6.3–8.2 |
| Independent living disability among adults | 7.5% | 6.3–9.0 |
| Mobility disability among adults | 13.9% | 11.5–16.5 |
| Self-care disability among adults | 3.7% | 3.1–4.4 |
| Vision disability among adults | 4.9% | 4.2–5.8 |
Health-Related Social NeedsCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Lack of social and emotional support among adults | 23.0% | 19.5–26.8 |
| Food insecurity in the past 12 months among adults | 12.2% | 9.4–15.2 |
| Received food stamps in the past 12 months among adults | 10.2% | 7.7–13.0 |
| Housing insecurity in the past 12 months among adults | 11.0% | 8.9–13.3 |
| Lack of reliable transportation in the past 12 months among adults | 7.2% | 5.9–8.6 |
| Loneliness among adults | 33.7% | 29.3–38.1 |
| Utility services shut-off threat in the past 12 months among adults | 5.5% | 4.5–6.7 |
Community & economyCensus ACS 5-Year · 2024 release · observed
| Measure | Value | US median (p10–p90) | CA median (p10–p90) |
|---|---|---|---|
| Poverty rate | 9.1% | 10.6% (3.1–25.8%) n=32,364 | 10.6% (4.1–24.9%) n=1,714 |
| Uninsured 18–64 | 29.0% | 9.0% (1.5–24.3%) n=32,286 | 7.7% (1.7–17.9%) n=1,704 |
| No HS diploma (25+) | 16.6% | 7.9% (1.8–20.7%) n=32,505 | 9.8% (1.4–30.9%) n=1,729 |
| Bachelor's or higher (25+) | 22.3% | 23.3% (9.2–53.6%) n=32,505 | 31.3% (9.9–68.2%) n=1,729 |
| Unemployment rate (16+) | 14.4% | 3.9% (0.0–9.8%) n=32,274 | 6.1% (0.8–12.0%) n=1,714 |
| Households without a vehicle | 14.7% | 3.9% (0.0–12.5%) n=32,322 | 4.5% (0.0–12.2%) n=1,708 |
| Broadband subscription | 85.3% | 89.3% (75.1–97.1%) n=32,322 | 93.4% (82.1–98.4%) n=1,708 |
| Housing cost burden (≥30% income) | 39.0% | 23.7% (10.6–40.0%) n=32,322 | 38.6% (24.4–50.5%) n=1,708 |
| Homeownership rate | 100.0% | 78.7% (51.7–94.0%) n=32,322 | 64.1% (31.9–86.4%) n=1,708 |
| Crowded housing (>1 per room) | 13.1% | 1.3% (0.0–6.3%) n=32,322 | 4.8% (0.0–15.9%) n=1,708 |
| Foreign-born population | 27.5% | 2.6% (0.0–18.6%) n=32,553 | 18.9% (3.0–40.4%) n=1,730 |
| Single-parent households | 35.4% | 53.6% (37.3–74.1%) n=32,087 | 48.4% (35.1–72.3%) n=1,692 |
| Population 65+ | 12.9% | 19.4% (10.8–33.6%) n=32,553 | 17.0% (9.7–35.7%) n=1,730 |
| Median age | 44.2 yr | 42.2 yr (33.0–56.3) n=32,292 | 40.1 yr (31.8–57.0) n=1,712 |
| Median household income | $189,653 | $72,070 ($46,039–$118,707) n=30,318 | $93,448 ($54,188–$159,562) n=1,584 |
| Median home value | $959,900 | $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 | 84.4 yr ± 3.20 | 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 3.20 years of 84.4, 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