ZIP code
21918
in Conowingo, MarylandPopulation 4,169
48.29/ 100
Ranked #18,565 of 32,066 US ZIPs (bottom 42%)
Ranked #407 of 458 Maryland ZIPs (bottom 11.2%)
Ranked #303 of 361 Philadelphia-Camden-Wilmington, PA-NJ-DE-MD 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.
Distance to a Superfund site
1 mi
in the bottom 7.1% nationally
Higher is healthier
ST8thUS7thDefinition & 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 ›Industrial-pollution burden
in the top 14.0% nationally
Lower is healthier
ST97thUS86thDefinition & 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 ›Mammography
69.8%
in the bottom 13.2% nationally
Higher is healthier
ST1stUS13thDefinition & source ›
The estimated share of women aged 50–74 who had a mammogram within the past two years.
Full methodology ›Distance to an emergency room
13.4 mi
in the top 14.4% nationally
Lower is healthier
ST92ndUS86thDefinition & source ›
The distance in miles from this ZIP’s edge to the nearest Medicare-certified hospital with an emergency room.
Full methodology ›Colon-cancer screening
61.5%
in the bottom 20% nationally
Higher is healthier
ST4thUS20thDefinition & source ›
The estimated share of adults aged 45–75 who are up to date on colorectal-cancer screening.
Full methodology ›Fine-particle (PM2.5) exceedance
0.27%
in the top 32% nationally
Lower is healthier
ST96thUS68thDefinition & source ›
The share of days in the year when modeled fine-particle (PM2.5) pollution was above the EPA’s daily limit of 35 micrograms per cubic meter.
Full methodology ›The read
Conowingo, Maryland (ZIP 21918), by its composite score, sits in the bottom 42% nationally (18,565th) and the bottom 11.2% of Maryland (407th).
The data opens on a genuinely even set of readings: distance to a community health center sits at the national minimum, shared with about 23% of ZIPs. Home broadband subscription lies in the top 15.0% nationally, and households without a vehicle rests in the bottom 17% nationally. On the other side, distance to a Superfund site resides in the bottom 7.1% nationally. Fiber broadband is at the national minimum, shared with about 19% of ZIPs. Modeled industrial-pollution burden lands in the top 14.0% nationally, modeled mammography stands in the bottom 13.2% nationally, and distance to an emergency room registers in the top 14.4% nationally. Recreation settles at the national minimum, shared with about 35% of ZIPs. Modeled obesity sits in the top 16% nationally.
For anyone unfamiliar, distance to a Superfund site is an abandoned or uncontrolled hazardous-waste site the EPA has identified for cleanup. Industrial-pollution burden is the EPA's modeled screening score weighting industrial chemical releases by their toxicity and how many people live nearby. Distance to a community health center is a federally funded (HRSA) community health center serving everyone regardless of ability to pay. For a healthier comparison close by, see ZIP 21160, 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 Philadelphia-Camden-Wilmington, PA-NJ-DE-MD metro area.
Compared with the ZIP codes measured across all nine scoring domains — not with all US ZIP codes.
Nothing measured is lifting this score.
About typical
Social Need / SDOH
healthier than 58%
16%
Environmental Hazard
healthier than 42%
14%
Disability
healthier than 55%
7%
Climate / Disaster Risk
healthier than 41%
5%
Healthcare Access
healthier than 57%
5%
Holding it back
Chronic Disease Burden
healthier than 37%
21%
Preventive Care
healthier than 36%
13%
Risk Behavior
healthier than 35%
11%
Mental Health
healthier than 35%
8%
Nothing measured is lifting this score.
About typical
Healthcare Access
healthier than 55%
5%
Holding it back
Chronic Disease Burden
healthier than 21%
21%
Social Need / SDOH
healthier than 31%
16%
Environmental Hazard
healthier than 24%
14%
Preventive Care
healthier than 10%
13%
Risk Behavior
healthier than 12%
11%
Mental Health
healthier than 11%
8%
Disability
healthier than 21%
7%
Climate / Disaster Risk
healthier than 27%
5%
Nothing measured is lifting this score.
About typical
Environmental Hazard
healthier than 55%
14%
Holding it back
Chronic Disease Burden
healthier than 7%
21%
Social Need / SDOH
healthier than 25%
16%
Preventive Care
healthier than 19%
13%
Risk Behavior
healthier than 24%
11%
Mental Health
healthier than 3%
8%
Disability
healthier than 15%
7%
Climate / Disaster Risk
healthier than 26%
5%
Healthcare Access
healthier than 37%
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
17563
Pennsylvaniashares a border
Score 35.50
Closest healthier
21160
Marylandshares a border
Score 57.17
Similar health profile
44270
Ohio93% similar profile
Score 48.77
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 | 31.4% | 28.6–34.1 |
| High blood pressure among adults | 40.4% | 37.1–43.6 |
| Cancer (non-skin) or melanoma among adults | 9.6% | 8.7–10.6 |
| Current asthma among adults | 10.7% | 9.5–11.9 |
| Coronary heart disease among adults | 7.2% | 6.4–8.0 |
| Chronic obstructive pulmonary disease among adults | 8.7% | 7.6–9.9 |
| Depression among adults | 23.9% | 21.0–27.0 |
| Diagnosed diabetes among adults | 13.7% | 12.1–15.4 |
| High cholesterol among adults who have ever been screened | 41.0% | 37.8–44.3 |
| Obesity among adults | 41.3% | 36.6–46.3 |
| Stroke among adults | 3.8% | 3.4–4.1 |
| All teeth lost among adults aged >=65 years | 11.5% | 9.5–13.7 |
PreventionCDC PLACES 2022 / 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Current lack of health insurance among adults aged 18-64 years | 7.8% | 6.4–9.4 |
| Taking medicine to control high blood pressure among adults with high blood pressure | 78.5% | 75.8–80.9 |
| Visits to doctor for routine checkup within the past year among adults | 77.2% | 74.3–80.1 |
| Cholesterol screening among adults | 88.0% | 86.2–89.5 |
| Colorectal cancer screening among adults aged 45–75 years | 61.5% | 57.3–65.5 |
| Visited dentist or dental clinic in the past year among adults | 62.5% | 59.3–65.6 |
| Mammography use among women aged 50-74 years | 69.8% | 63.2–75.8 |
Health Risk BehaviorsCDC PLACES 2022 / 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Binge drinking among adults | 14.9% | 12.6–17.5 |
| Current cigarette smoking among adults | 16.8% | 14.3–19.4 |
| No leisure-time physical activity among adults | 28.5% | 24.8–32.3 |
| Short sleep duration among adults | 38.3% | 34.0–42.8 |
Health StatusCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Fair or poor self-rated health status among adults | 20.5% | 17.8–23.2 |
| Frequent mental distress among adults | 17.9% | 15.9–19.9 |
| Frequent physical distress among adults | 15.1% | 13.3–16.8 |
DisabilityCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Cognitive disability among adults | 14.8% | 13.0–16.7 |
| Any disability among adults | 31.8% | 28.1–35.3 |
| Hearing disability among adults | 7.6% | 6.7–8.4 |
| Independent living disability among adults | 8.2% | 7.2–9.3 |
| Mobility disability among adults | 14.8% | 12.9–16.8 |
| Self-care disability among adults | 3.9% | 3.5–4.4 |
| Vision disability among adults | 4.7% | 4.1–5.2 |
Health-Related Social NeedsCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Lack of social and emotional support among adults | 22.0% | 19.0–25.4 |
| Food insecurity in the past 12 months among adults | 12.8% | 10.7–15.4 |
| Received food stamps in the past 12 months among adults | 10.6% | 8.8–12.8 |
| Housing insecurity in the past 12 months among adults | 10.7% | 9.0–12.7 |
| Lack of reliable transportation in the past 12 months among adults | 7.0% | 6.0–8.1 |
| Loneliness among adults | 32.3% | 28.3–36.7 |
| Utility services shut-off threat in the past 12 months among adults | 6.8% | 5.9–7.9 |
Community & economyCensus ACS 5-Year · 2024 release · observed
| Measure | Value | US median (p10–p90) | MD median (p10–p90) |
|---|---|---|---|
| Poverty rate | 6.1% | 10.6% (3.1–25.8%) n=32,364 | 6.7% (1.1–19.3%) n=459 |
| Uninsured 18–64 | 2.1% | 9.0% (1.5–24.3%) n=32,286 | 4.8% (0.0–13.1%) n=459 |
| No HS diploma (25+) | 11.7% | 7.9% (1.8–20.7%) n=32,505 | 6.3% (0.5–16.6%) n=463 |
| Bachelor's or higher (25+) | 16.1% | 23.3% (9.2–53.6%) n=32,505 | 37.3% (15.0–64.4%) n=463 |
| Unemployment rate (16+) | 3.1% | 3.9% (0.0–9.8%) n=32,274 | 3.9% (0.0–8.6%) n=457 |
| Households without a vehicle | 0.6% | 3.9% (0.0–12.5%) n=32,322 | 3.2% (0.0–12.4%) n=457 |
| Broadband subscription | 95.9% | 89.3% (75.1–97.1%) n=32,322 | 93.3% (81.2–100.0%) n=457 |
| Housing cost burden (≥30% income) | 22.7% | 23.7% (10.6–40.0%) n=32,322 | 27.0% (12.0–41.8%) n=457 |
| Homeownership rate | 88.6% | 78.7% (51.7–94.0%) n=32,322 | 82.1% (49.9–98.5%) n=457 |
| Crowded housing (>1 per room) | 1.5% | 1.3% (0.0–6.3%) n=32,322 | 0.7% (0.0–4.0%) n=457 |
| Foreign-born population | 0.3% | 2.6% (0.0–18.6%) n=32,553 | 6.2% (0.0–26.4%) n=464 |
| Single-parent households | 64.1% | 53.6% (37.3–74.1%) n=32,087 | 50.9% (34.0–73.3%) n=450 |
| Population 65+ | 22.4% | 19.4% (10.8–33.6%) n=32,553 | 18.0% (10.9–33.1%) n=464 |
| Median age | 42.9 yr | 42.2 yr (33.0–56.3) n=32,292 | 41.8 yr (34.2–57.2) n=460 |
| Median household income | $84,587 | $72,070 ($46,039–$118,707) n=30,318 | $106,181 ($62,879–$172,423) n=419 |
| Median home value | $324,800 | $222,200 ($100,300–$579,820) n=30,049 | $423,400 ($215,180–$683,660) n=427 |
| Median gross rent | $876 | $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 | 75.6 yr ± 0.94 | 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 0.94 years of 75.6, 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