ZIP code
94027
in Atherton, CaliforniaPopulation 7,002
73.25/ 100
Ranked #152 of 32,066 US ZIPs (top 0.5%)
Ranked #20 of 1,719 California ZIPs (top 1.2%)
Ranked #8 of 174 San Francisco-Oakland-Fremont, CA ZIPs (top 4.6%)
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
$250,001
at the national maximum
Higher is healthier
ST99thUS99thDefinition & source ›
The middle household income in this ZIP — half of households earn more, half earn less — in dollars per year.
Full methodology ›Utility shut-off threat
2.5%
in the bottom 0.2% nationally
Lower is healthier
ST1stUS1stDefinition & source ›
The estimated share of adults whose household was threatened with a utility shut-off in the past 12 months.
Full methodology ›Housing insecurity
4.7%
in the bottom 0.4% nationally
Lower is healthier
ST1stUS1stDefinition & source ›
The estimated share of adults who experienced housing insecurity in the past 12 months.
Full methodology ›Obesity
19.6%
in the bottom 0.9% nationally
Lower is healthier
ST6thUS1stDefinition & source ›
The estimated share of adults with obesity, defined as a body-mass index of 30 or higher.
Full methodology ›Short sleep
24%
in the bottom 0.2% nationally
Lower is healthier
ST1stUS1stDefinition & source ›
The estimated share of adults who usually sleep less than seven hours in a 24-hour period.
Full methodology ›Food insecurity
5.4%
in the bottom 0.7% nationally
Lower is healthier
ST1stUS1stDefinition & source ›
The estimated share of adults who experienced food insecurity in the past 12 months.
Full methodology ›Lack of transportation
3.9%
in the bottom 1.3% nationally
Lower is healthier
ST2ndUS1stDefinition & source ›
The estimated share of adults who lacked reliable transportation in the past 12 months.
Full methodology ›Fiber broadband
99.6%
in the top 3.2% nationally
Higher is healthier
ST99thUS97thDefinition & source ›
The share of homes where fiber-optic internet service is available.
Full methodology ›Floodplain exposure
0.00%
at the national minimum
Lower is healthier
ST1stUS1stDefinition & 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 ›Cognitive disability
8.7%
in the bottom 1.6% nationally
Lower is healthier
ST2ndUS2ndDefinition & source ›
The estimated share of adults with serious difficulty concentrating, remembering, or making decisions.
Full methodology ›The read
By the composite measure, Atherton, California (ZIP 94027) sits in the top 0.5% healthiest ZIPs nationally (152nd) and the top 1.2% of California (20th).
The profile cuts both ways, and the readings bear that out: household income lies at the national maximum, modeled utility shutoff settles in the bottom 0.2% nationally, and modeled housing insecurity stands in the bottom 0.4% nationally. Modeled obesity is in the bottom 0.9% nationally, short sleep rests in the bottom 0.2% nationally, and food insecurity sits in the bottom 0.7% nationally. Modeled transportation registers in the bottom 1.3% nationally, and fiber broadband lands in the top 3.2% nationally. Floodplain exposure resides at the national minimum, and modeled cognitive disability lies in the bottom 1.6% nationally.
Compared with the ZIPs that surround it, expected annual loss runs far lower than the surrounding ZIPs on this measure. In plain language, floodplain exposure is land with about a 1-in-100 chance of flooding each year, nicknamed the "100-year floodplain". ZIP 94304, about 0.8 miles away, ranks 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. 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 92%
21%
Social Need / SDOH
healthier than 98%
16%
Preventive Care
healthier than 90%
13%
Risk Behavior
in the top 0.3%
11%
Mental Health
healthier than 95%
8%
Disability
healthier than 96%
7%
Climate / Disaster Risk
healthier than 98%
5%
Healthcare Access
healthier than 88%
5%
Holding it back
Environmental Hazard
healthier than 37%
14%
Lifting this score
Chronic Disease Burden
healthier than 77%
21%
Social Need / SDOH
healthier than 96%
16%
Environmental Hazard
healthier than 65%
14%
Preventive Care
healthier than 97%
13%
Risk Behavior
in the top 0.6%
11%
Mental Health
healthier than 96%
8%
Disability
healthier than 95%
7%
Climate / Disaster Risk
healthier than 96%
5%
Healthcare Access
healthier than 76%
5%
Nothing measured is holding this score back.
Lifting this score
Social Need / SDOH
healthier than 79%
16%
Preventive Care
healthier than 91%
13%
Risk Behavior
healthier than 99%
11%
Mental Health
healthier than 91%
8%
Disability
healthier than 82%
7%
Climate / Disaster Risk
healthier than 90%
5%
Healthcare Access
healthier than 68%
5%
About typical
Chronic Disease Burden
healthier than 54%
21%
Holding it back
Environmental Hazard
healthier than 31%
14%
“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 ›
Findings that name this ZIP
One of our published findings lists this ZIP code. Each finding compares one published measure against a stated benchmark, and names only the ZIP codes whose estimates are reliable enough to rank. See all surprising findings.
Heavy environment, light chronic burden
Where the environment and chronic illness point in opposite directions
Environmental-hazard standing 36.9; chronic-disease standing 92.3 (top 10%) — 55 points apart, heavier on the environment than it is on chronic illness.
Ranked #14,938 of the 18,187 ZIP codes this finding names, ordered by the gap from cleanest environment to heaviest chronic burden, highest first.
Nearby & similar ZIPs
Editorially selected — see how this ZIP compares to nearby and similar places.
Nearby
94025
Californiashares a border
Score 69.79
Closest healthier
94304
Californiaabout 0.8 mi away
Score 74.95
Similar health profile
90077
California99% similar profile
Score 68.75
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 | 23.5% | 20.5–26.3 |
| High blood pressure among adults | 30.1% | 26.4–33.4 |
| Cancer (non-skin) or melanoma among adults | 10.3% | 9.4–11.3 |
| Current asthma among adults | 8.8% | 7.7–9.9 |
| Coronary heart disease among adults | 5.5% | 4.9–6.3 |
| Chronic obstructive pulmonary disease among adults | 3.8% | 3.2–4.4 |
| Depression among adults | 19.1% | 16.2–22.0 |
| Diagnosed diabetes among adults | 8.8% | 7.4–10.1 |
| High cholesterol among adults who have ever been screened | 38.6% | 34.5–42.3 |
| Obesity among adults | 19.6% | 15.3–24.0 |
| Stroke among adults | 2.6% | 2.4–3.0 |
| All teeth lost among adults aged >=65 years | 3.0% | 2.3–3.8 |
PreventionCDC PLACES 2022 / 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Current lack of health insurance among adults aged 18-64 years | 3.0% | 2.4–3.7 |
| Taking medicine to control high blood pressure among adults with high blood pressure | 77.1% | 73.7–79.8 |
| Visits to doctor for routine checkup within the past year among adults | 75.3% | 71.6–78.4 |
| Cholesterol screening among adults | 90.4% | 89.1–91.6 |
| Colorectal cancer screening among adults aged 45–75 years | 71.3% | 67.0–75.4 |
| Visited dentist or dental clinic in the past year among adults | 76.3% | 73.4–79.0 |
| Mammography use among women aged 50-74 years | 80.7% | 74.3–86.1 |
Health Risk BehaviorsCDC PLACES 2022 / 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Binge drinking among adults | 15.0% | 12.5–17.6 |
| Current cigarette smoking among adults | 5.2% | 4.1–6.3 |
| No leisure-time physical activity among adults | 14.3% | 11.6–17.3 |
| Short sleep duration among adults | 24.0% | 19.8–28.4 |
Health StatusCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Fair or poor self-rated health status among adults | 12.3% | 10.5–14.3 |
| Frequent mental distress among adults | 11.8% | 10.2–13.4 |
| Frequent physical distress among adults | 9.4% | 8.1–10.8 |
DisabilityCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Cognitive disability among adults | 8.7% | 7.4–10.0 |
| Any disability among adults | 22.1% | 18.9–25.4 |
| Hearing disability among adults | 5.9% | 5.2–6.7 |
| Independent living disability among adults | 4.9% | 4.2–5.7 |
| Mobility disability among adults | 9.6% | 8.1–11.3 |
| Self-care disability among adults | 2.1% | 1.8–2.4 |
| Vision disability among adults | 2.8% | 2.5–3.2 |
Health-Related Social NeedsCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Lack of social and emotional support among adults | 20.4% | 17.5–23.6 |
| Food insecurity in the past 12 months among adults | 5.4% | 4.4–6.8 |
| Received food stamps in the past 12 months among adults | 3.8% | 3.0–4.8 |
| Housing insecurity in the past 12 months among adults | 4.7% | 3.9–5.7 |
| Lack of reliable transportation in the past 12 months among adults | 3.9% | 3.3–4.5 |
| Loneliness among adults | 31.6% | 27.3–36.1 |
| Utility services shut-off threat in the past 12 months among adults | 2.5% | 2.1–3.0 |
Community & economyCensus ACS 5-Year · 2024 release · observed
| Measure | Value | US median (p10–p90) | CA median (p10–p90) |
|---|---|---|---|
| Poverty rate | 5.3% | 10.6% (3.1–25.8%) n=32,364 | 10.6% (4.1–24.9%) n=1,714 |
| Uninsured 18–64 | 2.9% | 9.0% (1.5–24.3%) n=32,286 | 7.7% (1.7–17.9%) n=1,704 |
| No HS diploma (25+) | 1.4% | 7.9% (1.8–20.7%) n=32,505 | 9.8% (1.4–30.9%) n=1,729 |
| Bachelor's or higher (25+) | 83.2% | 23.3% (9.2–53.6%) n=32,505 | 31.3% (9.9–68.2%) n=1,729 |
| Unemployment rate (16+) | 3.2% | 3.9% (0.0–9.8%) n=32,274 | 6.1% (0.8–12.0%) n=1,714 |
| Households without a vehicle | 1.7% | 3.9% (0.0–12.5%) n=32,322 | 4.5% (0.0–12.2%) n=1,708 |
| Broadband subscription | 97.6% | 89.3% (75.1–97.1%) n=32,322 | 93.4% (82.1–98.4%) n=1,708 |
| Housing cost burden (≥30% income) | 35.6% | 23.7% (10.6–40.0%) n=32,322 | 38.6% (24.4–50.5%) n=1,708 |
| Homeownership rate | 87.6% | 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 | 20.5% | 2.6% (0.0–18.6%) n=32,553 | 18.9% (3.0–40.4%) n=1,730 |
| Single-parent households | 63.2% | 53.6% (37.3–74.1%) n=32,087 | 48.4% (35.1–72.3%) n=1,692 |
| Population 65+ | 25.7% | 19.4% (10.8–33.6%) n=32,553 | 17.0% (9.7–35.7%) n=1,730 |
| Median age | 49.1 yr | 42.2 yr (33.0–56.3) n=32,292 | 40.1 yr (31.8–57.0) n=1,712 |
| Median household income | $250,001 | $72,070 ($46,039–$118,707) n=30,318 | $93,448 ($54,188–$159,562) n=1,584 |
| Median home value | $2,000,001 | $222,200 ($100,300–$579,820) n=30,049 | $659,800 ($300,520–$1,493,340) n=1,593 |
| Median gross rent | $3,501 | $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 | 84.6 yr ± 1.18 | 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 1.18 years of 84.6, 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