ZIP code
94505
in Discovery Bay, CaliforniaPopulation 14,970
56.45/ 100
Ranked #7,807 of 32,066 US ZIPs (top 24%)
Ranked #696 of 1,719 California ZIPs (top 40%)
Ranked #146 of 174 San Francisco-Oakland-Fremont, CA ZIPs (bottom 16%)
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
$146,480
in the top 4.3% nationally
Higher is healthier
ST86thUS96thDefinition & source ›
The middle household income in this ZIP — half of households earn more, half earn less — in dollars per year.
Full methodology ›Floodplain exposure
48.6%
in the top 4.2% nationally
Lower is healthier
ST96thUS96thDefinition & source ›
The share of this ZIP’s land area inside FEMA’s 1%-annual-chance floodplain — the “100-year” flood zone, where flooding has about a 1-in-100 chance in any given year.
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 ›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
6.6%
in the top 5.7% nationally
Lower is healthier
ST86thUS94thDefinition & 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 ›Arsenic in groundwater
18.8%
in the top 7.1% nationally
Lower is healthier
ST91stUS93rdDefinition & 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 ›Home broadband subscription
98%
in the top 7.4% nationally
Higher is healthier
ST89thUS93rdDefinition & source ›
The share of households with a broadband internet subscription.
Full methodology ›Dry extreme heat
55.8 days/year
in the top 8.0% nationally
Lower is healthier
ST75thUS92ndDefinition & source ›
The average number of days per year with a modeled daily high of at least 95 °F.
Full methodology ›Tooth loss
6.6%
in the bottom 6.7% nationally
Lower is healthier
ST20thUS7thDefinition & source ›
The estimated share of adults aged 65 and older who have lost all of their natural teeth.
Full methodology ›Homeownership rate
90.2%
in the top 17% nationally
Higher is healthier
ST93rdUS83rdDefinition & source ›
The share of occupied homes that are owned, rather than rented, by the people living in them.
Full methodology ›The read
Discovery Bay, California (ZIP 94505), by its overall standing, sits in the top 24% healthiest ZIPs nationally (7,807th) and the top 40% of California (696th).
The measures fall on both sides of the ledger for this area: household income sits in the top 4.3% nationally, home broadband subscription settles in the top 7.4% nationally, and modeled tooth loss registers in the bottom 6.7% nationally. Lead in tap water stands in the bottom 13.2% nationally. Set against that, floodplain exposure lands in the top 4.2% nationally, and modeled tree cover is at the national minimum. Outer-floodplain exposure resides in the top 5.7% nationally, and modeled arsenic rests in the top 7.1% nationally. Modeled extreme heat lies in the top 8.0% nationally, and housing-cost burden sits in the top 11.7% nationally.
Held up against its neighbors, outer-floodplain exposure runs far higher than the surrounding ZIPs on this measure. Defined in plain terms, arsenic is a natural groundwater contaminant, here a modeled estimate of the chance private-well levels exceed a benchmark. Lead in tap water is the EPA trigger, 15 parts per billion in tap samples, above which a water system must act on lead. Floodplain exposure is land with about a 1-in-100 chance of flooding each year, nicknamed the "100-year floodplain". The nearest ZIP ranking healthier overall is 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 81%
21%
Social Need / SDOH
healthier than 75%
16%
Risk Behavior
healthier than 76%
11%
Disability
healthier than 79%
7%
About typical
Environmental Hazard
healthier than 57%
14%
Preventive Care
healthier than 51%
13%
Mental Health
healthier than 59%
8%
Holding it back
Climate / Disaster Risk
healthier than 4%
5%
Healthcare Access
healthier than 32%
5%
Lifting this score
Social Need / SDOH
healthier than 69%
16%
Environmental Hazard
healthier than 77%
14%
Preventive Care
healthier than 71%
13%
Disability
healthier than 74%
7%
About typical
Chronic Disease Burden
healthier than 50%
21%
Risk Behavior
healthier than 55%
11%
Mental Health
healthier than 53%
8%
Holding it back
Climate / Disaster Risk
healthier than 4%
5%
Healthcare Access
healthier than 20%
5%
Nothing measured is lifting this score.
About typical
Environmental Hazard
healthier than 53%
14%
Preventive Care
healthier than 51%
13%
Holding it back
Chronic Disease Burden
healthier than 16%
21%
Social Need / SDOH
healthier than 25%
16%
Risk Behavior
healthier than 24%
11%
Mental Health
healthier than 16%
8%
Disability
healthier than 31%
7%
Climate / Disaster Risk
in the bottom 0.6%
5%
Healthcare Access
healthier than 5%
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
95391
Californiashares a border
Score 69.39
Similar health profile
75762
Texas99% similar profile
Score 54.62
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 | 24.6% | 21.9–27.3 |
| High blood pressure among adults | 32.0% | 28.7–35.2 |
| Cancer (non-skin) or melanoma among adults | 8.5% | 7.7–9.3 |
| Current asthma among adults | 10.3% | 9.1–11.5 |
| Coronary heart disease among adults | 5.8% | 5.2–6.5 |
| Chronic obstructive pulmonary disease among adults | 5.4% | 4.7–6.1 |
| Depression among adults | 22.0% | 19.2–25.1 |
| Diagnosed diabetes among adults | 10.4% | 9.1–11.9 |
| High cholesterol among adults who have ever been screened | 36.7% | 33.1–40.2 |
| Obesity among adults | 29.8% | 25.1–34.5 |
| Stroke among adults | 3.1% | 2.8–3.4 |
| All teeth lost among adults aged >=65 years | 6.6% | 5.3–8.1 |
PreventionCDC PLACES 2022 / 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Current lack of health insurance among adults aged 18-64 years | 6.0% | 5.1–7.2 |
| Taking medicine to control high blood pressure among adults with high blood pressure | 72.8% | 69.3–75.9 |
| Visits to doctor for routine checkup within the past year among adults | 73.0% | 69.6–76.2 |
| Cholesterol screening among adults | 88.5% | 87.1–89.9 |
| Colorectal cancer screening among adults aged 45–75 years | 66.4% | 62.0–70.5 |
| Visited dentist or dental clinic in the past year among adults | 69.6% | 66.6–72.6 |
| Mammography use among women aged 50-74 years | 76.3% | 69.4–82.2 |
Health Risk BehaviorsCDC PLACES 2022 / 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Binge drinking among adults | 16.9% | 14.3–19.8 |
| Current cigarette smoking among adults | 10.3% | 8.7–12.1 |
| No leisure-time physical activity among adults | 21.4% | 18.2–24.8 |
| Short sleep duration among adults | 34.8% | 30.3–39.5 |
Health StatusCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Fair or poor self-rated health status among adults | 17.5% | 15.4–19.9 |
| Frequent mental distress among adults | 16.6% | 14.8–18.6 |
| Frequent physical distress among adults | 12.8% | 11.4–14.4 |
DisabilityCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Cognitive disability among adults | 12.7% | 11.2–14.2 |
| Any disability among adults | 27.4% | 24.1–30.9 |
| Hearing disability among adults | 6.1% | 5.4–6.9 |
| Independent living disability among adults | 7.2% | 6.4–8.1 |
| Mobility disability among adults | 12.2% | 10.6–13.9 |
| Self-care disability among adults | 3.3% | 2.9–3.6 |
| Vision disability among adults | 4.1% | 3.7–4.5 |
Health-Related Social NeedsCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Lack of social and emotional support among adults | 23.4% | 20.4–26.5 |
| Food insecurity in the past 12 months among adults | 10.7% | 9.1–12.4 |
| Received food stamps in the past 12 months among adults | 9.6% | 8.1–11.1 |
| Housing insecurity in the past 12 months among adults | 10.2% | 8.7–11.7 |
| Lack of reliable transportation in the past 12 months among adults | 6.7% | 5.8–7.5 |
| Loneliness among adults | 34.0% | 30.1–38.0 |
| Utility services shut-off threat in the past 12 months among adults | 5.5% | 4.7–6.3 |
Community & economyCensus ACS 5-Year · 2024 release · observed
| Measure | Value | US median (p10–p90) | CA median (p10–p90) |
|---|---|---|---|
| Poverty rate | 7.4% | 10.6% (3.1–25.8%) n=32,364 | 10.6% (4.1–24.9%) n=1,714 |
| Uninsured 18–64 | 5.6% | 9.0% (1.5–24.3%) n=32,286 | 7.7% (1.7–17.9%) n=1,704 |
| No HS diploma (25+) | 5.7% | 7.9% (1.8–20.7%) n=32,505 | 9.8% (1.4–30.9%) n=1,729 |
| Bachelor's or higher (25+) | 32.6% | 23.3% (9.2–53.6%) n=32,505 | 31.3% (9.9–68.2%) n=1,729 |
| Unemployment rate (16+) | 8.6% | 3.9% (0.0–9.8%) n=32,274 | 6.1% (0.8–12.0%) n=1,714 |
| Households without a vehicle | 2.3% | 3.9% (0.0–12.5%) n=32,322 | 4.5% (0.0–12.2%) n=1,708 |
| Broadband subscription | 98.0% | 89.3% (75.1–97.1%) n=32,322 | 93.4% (82.1–98.4%) n=1,708 |
| Housing cost burden (≥30% income) | 38.7% | 23.7% (10.6–40.0%) n=32,322 | 38.6% (24.4–50.5%) n=1,708 |
| Homeownership rate | 90.2% | 78.7% (51.7–94.0%) n=32,322 | 64.1% (31.9–86.4%) n=1,708 |
| Crowded housing (>1 per room) | 0.0% | 1.3% (0.0–6.3%) n=32,322 | 4.8% (0.0–15.9%) n=1,708 |
| Foreign-born population | 12.2% | 2.6% (0.0–18.6%) n=32,553 | 18.9% (3.0–40.4%) n=1,730 |
| Single-parent households | 57.1% | 53.6% (37.3–74.1%) n=32,087 | 48.4% (35.1–72.3%) n=1,692 |
| Population 65+ | 19.2% | 19.4% (10.8–33.6%) n=32,553 | 17.0% (9.7–35.7%) n=1,730 |
| Median age | 45.8 yr | 42.2 yr (33.0–56.3) n=32,292 | 40.1 yr (31.8–57.0) n=1,712 |
| Median household income | $146,480 | $72,070 ($46,039–$118,707) n=30,318 | $93,448 ($54,188–$159,562) n=1,584 |
| Median home value | $830,500 | $222,200 ($100,300–$579,820) n=30,049 | $659,800 ($300,520–$1,493,340) n=1,593 |
| Median gross rent | $3,029 | $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 | 80.9 yr ± 0.94 | 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 0.94 years of 80.9, 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