ZIP code
21757
in Keymar, MarylandPopulation 2,671
55.59/ 100
Ranked #8,754 of 32,066 US ZIPs (top 27%)
Ranked #288 of 458 Maryland ZIPs (bottom 37%)
Ranked #241 of 308 Washington-Arlington-Alexandria, DC-VA-MD-WV ZIPs (bottom 22%)
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.
Poverty rate
1.7%
in the bottom 6.3% nationally
Lower is healthier
ST13thUS6thDefinition & source ›
The share of residents whose income is below the federal poverty line, from the Census Bureau’s American Community Survey.
Full methodology ›Nitrate in drinking water
1.2%
in the top 6.3% nationally
Lower is healthier
ST82ndUS94thDefinition & source ›
The modeled share of this area’s domestic-well groundwater at or above the federal nitrate limit of 10 milligrams 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 ›Distance to a community health center
9.6 mi
in the top 21% nationally
Lower is healthier
ST92ndUS79thDefinition & source ›
The distance in miles from this ZIP’s edge to the nearest federally funded community health center, which serves patients regardless of ability to pay.
Full methodology ›The read
Keymar, Maryland (ZIP 21757), by its overall standing, sits in the top 27% healthiest ZIPs nationally (8,754th) and the bottom 37% of Maryland (288th).
Several readings land clearly in this area's favor and shape the picture: poverty rests in the bottom 6.3% nationally. Crowded housing lies at the national minimum, shared with about 29% of ZIPs. Modeled pfas sits in the bottom 14.9% nationally, and transportation settles in the bottom 15% nationally. Modeled tooth loss registers in the bottom 16% nationally, and food insecurity stands in the bottom 19% nationally. Set against that, modeled nitrate lands in the top 6.3% nationally. Fiber broadband is at the national minimum, shared with about 19% of ZIPs. Physicians resides at the national minimum, shared with about 38% of ZIPs. Modeled high cholesterol rests in the top 16% nationally.
Held up against its neighbors, park land runs far lower than the surrounding ZIPs on this measure. Defined in plain terms, nitrate is a groundwater compound from fertilizer, manure, and sewage, here a modeled estimate of the chance private-well levels exceed a benchmark. 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. The nearest ZIP ranking healthier overall is ZIP 21798, 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 Washington-Arlington-Alexandria, DC-VA-MD-WV metro area.
Compared with the ZIP codes measured across all nine scoring domains — not with all US ZIP codes.
Lifting this score
Social Need / SDOH
healthier than 74%
16%
Preventive Care
healthier than 73%
13%
Risk Behavior
healthier than 73%
11%
Mental Health
healthier than 61%
8%
Disability
healthier than 75%
7%
About typical
Chronic Disease Burden
healthier than 50%
21%
Environmental Hazard
healthier than 52%
14%
Climate / Disaster Risk
healthier than 56%
5%
Holding it back
Healthcare Access
healthier than 25%
5%
Nothing measured is lifting this score.
About typical
Social Need / SDOH
healthier than 50%
16%
Risk Behavior
healthier than 50%
11%
Disability
healthier than 45%
7%
Climate / Disaster Risk
healthier than 54%
5%
Holding it back
Chronic Disease Burden
healthier than 33%
21%
Environmental Hazard
healthier than 34%
14%
Preventive Care
healthier than 37%
13%
Mental Health
healthier than 30%
8%
Healthcare Access
healthier than 11%
5%
Nothing measured is lifting this score.
About typical
Environmental Hazard
healthier than 46%
14%
Preventive Care
healthier than 45%
13%
Climate / Disaster Risk
healthier than 59%
5%
Holding it back
Chronic Disease Burden
healthier than 15%
21%
Social Need / SDOH
healthier than 30%
16%
Risk Behavior
healthier than 32%
11%
Mental Health
healthier than 20%
8%
Disability
healthier than 31%
7%
Healthcare Access
healthier than 16%
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
21727
Marylandshares a border
Score 54.07
Closest healthier
21798
Marylandshares a border
Score 58.63
Similar health profile
44286
Ohio98% similar profile
Score 62.31
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 | 31.1% | 29.0–33.0 |
| High blood pressure among adults | 38.1% | 35.7–40.3 |
| Cancer (non-skin) or melanoma among adults | 10.7% | 10.0–11.4 |
| Current asthma among adults | 10.2% | 9.3–11.0 |
| Coronary heart disease among adults | 7.2% | 6.5–7.8 |
| Chronic obstructive pulmonary disease among adults | 7.3% | 6.5–8.2 |
| Depression among adults | 22.7% | 20.6–24.7 |
| Diagnosed diabetes among adults | 11.9% | 10.7–13.0 |
| High cholesterol among adults who have ever been screened | 42.0% | 39.5–44.2 |
| Obesity among adults | 37.2% | 33.6–40.5 |
| Stroke among adults | 3.5% | 3.2–3.8 |
| All teeth lost among adults aged >=65 years | 8.5% | 7.2–9.8 |
PreventionCDC PLACES 2022 / 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Current lack of health insurance among adults aged 18-64 years | 6.9% | 5.8–8.2 |
| Taking medicine to control high blood pressure among adults with high blood pressure | 78.4% | 76.2–80.2 |
| Visits to doctor for routine checkup within the past year among adults | 78.2% | 75.9–80.1 |
| Cholesterol screening among adults | 90.0% | 88.8–91.0 |
| Colorectal cancer screening among adults aged 45–75 years | 69.3% | 66.5–72.0 |
| Visited dentist or dental clinic in the past year among adults | 63.7% | 61.4–66.1 |
| Mammography use among women aged 50-74 years | 76.2% | 72.0–80.2 |
Health Risk BehaviorsCDC PLACES 2022 / 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Binge drinking among adults | 15.4% | 13.6–17.0 |
| Current cigarette smoking among adults | 12.2% | 10.6–13.8 |
| No leisure-time physical activity among adults | 23.9% | 21.3–26.7 |
| Short sleep duration among adults | 35.0% | 32.0–38.1 |
Health StatusCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Fair or poor self-rated health status among adults | 16.8% | 15.0–18.6 |
| Frequent mental distress among adults | 15.8% | 14.4–17.2 |
| Frequent physical distress among adults | 12.8% | 11.5–14.0 |
DisabilityCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Cognitive disability among adults | 12.5% | 11.3–13.8 |
| Any disability among adults | 27.5% | 24.9–30.1 |
| Hearing disability among adults | 7.4% | 6.7–8.1 |
| Independent living disability among adults | 6.9% | 6.2–7.7 |
| Mobility disability among adults | 12.8% | 11.3–14.3 |
| Self-care disability among adults | 3.3% | 3.0–3.7 |
| Vision disability among adults | 4.0% | 3.6–4.3 |
Health-Related Social NeedsCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Lack of social and emotional support among adults | 21.6% | 19.2–23.9 |
| Food insecurity in the past 12 months among adults | 9.9% | 8.4–11.4 |
| Received food stamps in the past 12 months among adults | 7.6% | 6.4–8.9 |
| Housing insecurity in the past 12 months among adults | 8.8% | 7.6–10.0 |
| Lack of reliable transportation in the past 12 months among adults | 5.6% | 5.0–6.3 |
| Loneliness among adults | 31.4% | 28.3–34.4 |
| Utility services shut-off threat in the past 12 months among adults | 5.6% | 4.9–6.3 |
Community & economyCensus ACS 5-Year · 2024 release · observed
| Measure | Value | US median (p10–p90) | MD median (p10–p90) |
|---|---|---|---|
| Poverty rate | 1.7% | 10.6% (3.1–25.8%) n=32,364 | 6.7% (1.1–19.3%) n=459 |
| Uninsured 18–64 | 4.1% | 9.0% (1.5–24.3%) n=32,286 | 4.8% (0.0–13.1%) n=459 |
| No HS diploma (25+) | 8.3% | 7.9% (1.8–20.7%) n=32,505 | 6.3% (0.5–16.6%) n=463 |
| Bachelor's or higher (25+) | 29.5% | 23.3% (9.2–53.6%) n=32,505 | 37.3% (15.0–64.4%) n=463 |
| Unemployment rate (16+) | 3.2% | 3.9% (0.0–9.8%) n=32,274 | 3.9% (0.0–8.6%) n=457 |
| Households without a vehicle | 2.6% | 3.9% (0.0–12.5%) n=32,322 | 3.2% (0.0–12.4%) n=457 |
| Broadband subscription | 90.0% | 89.3% (75.1–97.1%) n=32,322 | 93.3% (81.2–100.0%) n=457 |
| Housing cost burden (≥30% income) | 24.4% | 23.7% (10.6–40.0%) n=32,322 | 27.0% (12.0–41.8%) n=457 |
| Homeownership rate | 82.4% | 78.7% (51.7–94.0%) n=32,322 | 82.1% (49.9–98.5%) n=457 |
| Crowded housing (>1 per room) | 0.0% | 1.3% (0.0–6.3%) n=32,322 | 0.7% (0.0–4.0%) n=457 |
| Foreign-born population | 4.3% | 2.6% (0.0–18.6%) n=32,553 | 6.2% (0.0–26.4%) n=464 |
| Single-parent households | 58.0% | 53.6% (37.3–74.1%) n=32,087 | 50.9% (34.0–73.3%) n=450 |
| Population 65+ | 18.9% | 19.4% (10.8–33.6%) n=32,553 | 18.0% (10.9–33.1%) n=464 |
| Median age | 37.8 yr | 42.2 yr (33.0–56.3) n=32,292 | 41.8 yr (34.2–57.2) n=460 |
| Median household income | $100,500 | $72,070 ($46,039–$118,707) n=30,318 | $106,181 ($62,879–$172,423) n=419 |
| Median home value | $466,100 | $222,200 ($100,300–$579,820) n=30,049 | $423,400 ($215,180–$683,660) n=427 |
| Median gross rent | $1,408 | $1,021 ($677–$1,912) n=25,670 | $1,626 ($958–$2,415) n=339 |
Life expectancyNCHS / RWJF USALEEP · model-based
| Measure | Value | US median (p10–p90) | MD median (p10–p90) |
|---|---|---|---|
| Life expectancy at birth | 78.2 yr ± 0.98 | 78.9 yr (74.7–82.8) n=31,308 | 79.5 yr (75.7–82.7) n=451 |
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 0.98 years of 78.2, 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