ZIP code
51055
in Sloan, IowaPopulation 1,346
53.48/ 100
Ranked #11,393 of 32,066 US ZIPs (top 36%)
Ranked #381 of 922 Iowa ZIPs (top 41%)
Ranked #12 of 30 Sioux City, IA-NE-SD ZIPs (top 40%)
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.
Radon
4.1 pCi/L
in the top 1.7% nationally
Lower is healthier
ST80thUS98thDefinition & source ›
The modeled typical indoor radon level for this area, in picocuries per liter — the EPA recommends fixing a home at 4 pCi/L or above.
Modeled from indoor-radon measurements. In Alaska and Hawaii, where those measurements are not published, a US Geological Survey geologic radon-potential category stands in — a coarser input, disclosed rather than hidden.
Full methodology ›Arsenic in groundwater
27.9%
in the top 3.7% nationally
Lower is healthier
ST89thUS96thDefinition & 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 ›Outer-floodplain exposure
7.3%
in the top 5.1% nationally
Lower is healthier
ST99thUS95thDefinition & 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 ›Short sleep
29.1%
in the bottom 6.2% nationally
Lower is healthier
ST8thUS6thDefinition & source ›
The estimated share of adults who usually sleep less than seven hours in a 24-hour period.
Full methodology ›Civic-institution access
0.72 per 1,000 residents
in the top 7.3% nationally
Higher is healthier
ST89thUS93rdDefinition & source ›
The number of civic and social organizations inside this ZIP’s boundary, per 1,000 residents.
Counted from establishments located inside this ZIP’s boundary, so one just across the line is not counted. Where a ZIP has too few residents for the density to be reliable, no value is published rather than an unreliable one.
Full methodology ›Fatal road crashes
37.1 per 100,000 residents per year
in the top 8.3% nationally
Lower is healthier
ST97thUS92ndDefinition & source ›
The annual rate of fatal road crashes per 100,000 residents, pooled over a ten-year window.
A rate per resident population. Where a ZIP has too few residents for the rate to be reliable — about 30% of US ZIPs — no value is published rather than an unstable one; those ZIPs are absent from this comparison, not counted as crash-free.
Full methodology ›Binge drinking
19.6%
in the top 7.9% nationally
Lower is healthier
ST47thUS92ndDefinition & source ›
The estimated share of adults who report binge drinking — five or more drinks on one occasion for men, four or more for women.
Full methodology ›Fine-particle (PM2.5) exceedance
1.00%
in the top 9.6% nationally
Lower is healthier
ST92ndUS90thDefinition & 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 ›Slow internet speeds
1.2%
in the top 9.6% nationally
Lower is healthier
ST97thUS90thDefinition & source ›
The share of homes whose fastest available download speed is under 10 Mbps.
Full methodology ›Floodplain exposure
30.6%
in the top 9.8% nationally
Lower is healthier
ST95thUS90thDefinition & 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 ›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.
USGS models a high likelihood that groundwater arsenic here exceeds 10 µg/L — the level EPA sets as the limit for public water systems — and this area's modeled radon runs above EPA's 4 pCi/L action level.
See the full radon & arsenic analysis →
The read
On balance, and by the composite measure, Sloan, Iowa (ZIP 51055) ranks in the top 36% healthiest ZIPs nationally (11,393rd) and the top 41% of Iowa (381st).
Neither strongly one way nor the other, the measures sit mixed: modeled short sleep stands in the bottom 6.2% nationally, and civic settles in the top 7.3% nationally. Against that, modeled radon lies in the top 1.7% nationally, and arsenic resides in the top 3.7% nationally. Outer-floodplain exposure lands in the top 5.1% nationally, fatal road crashes registers in the top 8.3% nationally, and modeled binge drinking sits in the top 7.9% nationally. Modeled fine-particle rests in the top 9.6% nationally, slow internet speeds is in the top 9.6% nationally, and floodplain exposure stands in the top 9.8% nationally.
Compared with the ZIPs it borders, outer-floodplain exposure runs far higher than the surrounding ZIPs on this measure. In plainer terms, radon is a radioactive soil gas the EPA identifies as the top cause of lung cancer in nonsmokers. Arsenic is a natural groundwater contaminant, here a modeled estimate of the chance private-well levels exceed a benchmark. Fine-particle is fine airborne particles about one-thirtieth the width of a hair, counted on modeled days above the EPA standard. For a healthier nearby ZIP overall, look to ZIP 51054, about 4.6 miles away.
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 Sioux City, IA-NE-SD 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 63%
21%
Preventive Care
healthier than 80%
13%
Mental Health
healthier than 76%
8%
Disability
healthier than 75%
7%
About typical
Social Need / SDOH
healthier than 41%
16%
Risk Behavior
healthier than 60%
11%
Holding it back
Environmental Hazard
healthier than 12%
14%
Climate / Disaster Risk
healthier than 19%
5%
Healthcare Access
healthier than 13%
5%
Lifting this score
Chronic Disease Burden
healthier than 71%
21%
Preventive Care
healthier than 68%
13%
Risk Behavior
healthier than 87%
11%
Disability
healthier than 76%
7%
About typical
Social Need / SDOH
healthier than 50%
16%
Mental Health
healthier than 58%
8%
Holding it back
Environmental Hazard
healthier than 11%
14%
Climate / Disaster Risk
healthier than 3%
5%
Healthcare Access
healthier than 35%
5%
Lifting this score
Environmental Hazard
healthier than 62%
14%
Preventive Care
healthier than 86%
13%
Risk Behavior
healthier than 79%
11%
Disability
healthier than 76%
7%
About typical
Chronic Disease Burden
healthier than 55%
21%
Mental Health
healthier than 45%
8%
Holding it back
Social Need / SDOH
healthier than 34%
16%
Climate / Disaster Risk
healthier than 14%
5%
Healthcare Access
healthier than 21%
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 ›
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 11.9; chronic-disease standing 62.6 — 51 points apart, heavier on the environment than it is on chronic illness.
Ranked #14,456 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
51026
Iowashares a border
Score 51.85
Closest healthier
51054
Iowaabout 4.6 mi away
Score 57.19
Similar health profile
56546
Minnesota96% similar profile
Score 54.29
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 | 28.4% | 25.8–30.9 |
| High blood pressure among adults | 36.5% | 33.5–39.5 |
| Cancer (non-skin) or melanoma among adults | 9.7% | 8.9–10.6 |
| Current asthma among adults | 9.8% | 8.7–10.9 |
| Coronary heart disease among adults | 6.9% | 6.1–7.7 |
| Chronic obstructive pulmonary disease among adults | 7.2% | 6.2–8.4 |
| Depression among adults | 20.2% | 17.8–22.8 |
| Diagnosed diabetes among adults | 11.7% | 10.2–13.2 |
| High cholesterol among adults who have ever been screened | 36.6% | 33.6–39.7 |
| Obesity among adults | 38.1% | 33.8–42.5 |
| Stroke among adults | 3.4% | 3.1–3.8 |
| All teeth lost among adults aged >=65 years | 9.5% | 8.0–11.1 |
PreventionCDC PLACES 2022 / 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Current lack of health insurance among adults aged 18-64 years | 6.3% | 5.1–7.6 |
| Taking medicine to control high blood pressure among adults with high blood pressure | 80.6% | 78.2–82.7 |
| Visits to doctor for routine checkup within the past year among adults | 79.4% | 76.9–81.8 |
| Cholesterol screening among adults | 86.7% | 85.0–88.3 |
| Colorectal cancer screening among adults aged 45–75 years | 68.3% | 64.8–71.6 |
| Visited dentist or dental clinic in the past year among adults | 70.1% | 67.7–72.6 |
| Mammography use among women aged 50-74 years | 78.2% | 73.0–82.7 |
Health Risk BehaviorsCDC PLACES 2022 / 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Binge drinking among adults | 19.6% | 17.2–22.0 |
| Current cigarette smoking among adults | 14.6% | 12.3–17.0 |
| No leisure-time physical activity among adults | 24.7% | 21.4–28.4 |
| Short sleep duration among adults | 29.1% | 25.9–32.3 |
Health StatusCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Fair or poor self-rated health status among adults | 17.1% | 14.9–19.6 |
| Frequent mental distress among adults | 15.9% | 14.2–17.8 |
| Frequent physical distress among adults | 13.3% | 11.7–14.9 |
DisabilityCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Cognitive disability among adults | 12.4% | 10.9–14.1 |
| Any disability among adults | 26.9% | 23.8–30.3 |
| Hearing disability among adults | 7.7% | 6.9–8.6 |
| Independent living disability among adults | 6.9% | 6.0–7.8 |
| Mobility disability among adults | 12.6% | 10.9–14.5 |
| Self-care disability among adults | 3.3% | 2.9–3.7 |
| Vision disability among adults | 3.9% | 3.5–4.4 |
Health-Related Social NeedsCDC PLACES 2023 · BRFSS
| Measure | Crude prevalence | 95% CI |
|---|---|---|
| Lack of social and emotional support among adults | 22.6% | 19.7–25.7 |
| Food insecurity in the past 12 months among adults | 9.6% | 7.9–11.4 |
| Received food stamps in the past 12 months among adults | 8.1% | 6.5–9.8 |
| Housing insecurity in the past 12 months among adults | 7.9% | 6.6–9.2 |
| Lack of reliable transportation in the past 12 months among adults | 5.8% | 5.0–6.7 |
| Loneliness among adults | 30.7% | 27.1–34.3 |
| Utility services shut-off threat in the past 12 months among adults | 5.5% | 4.7–6.4 |
Community & economyCensus ACS 5-Year · 2024 release · observed
| Measure | Value | US median (p10–p90) | IA median (p10–p90) |
|---|---|---|---|
| Poverty rate | 14.6% | 10.6% (3.1–25.8%) n=32,364 | 8.5% (2.7–19.1%) n=931 |
| Uninsured 18–64 | 9.5% | 9.0% (1.5–24.3%) n=32,286 | 5.4% (0.7–14.7%) n=931 |
| No HS diploma (25+) | 5.9% | 7.9% (1.8–20.7%) n=32,505 | 5.1% (1.6–12.9%) n=932 |
| Bachelor's or higher (25+) | 27.9% | 23.3% (9.2–53.6%) n=32,505 | 20.9% (9.8–36.8%) n=932 |
| Unemployment rate (16+) | 6.5% | 3.9% (0.0–9.8%) n=32,274 | 2.2% (0.0–6.7%) n=932 |
| Households without a vehicle | 4.7% | 3.9% (0.0–12.5%) n=32,322 | 2.4% (0.0–7.9%) n=931 |
| Broadband subscription | 93.2% | 89.3% (75.1–97.1%) n=32,322 | 88.5% (77.9–95.1%) n=931 |
| Housing cost burden (≥30% income) | 23.5% | 23.7% (10.6–40.0%) n=32,322 | 18.2% (9.0–28.8%) n=931 |
| Homeownership rate | 69.9% | 78.7% (51.7–94.0%) n=32,322 | 82.1% (66.8–93.5%) n=931 |
| Crowded housing (>1 per room) | 1.5% | 1.3% (0.0–6.3%) n=32,322 | 0.4% (0.0–3.3%) n=931 |
| Foreign-born population | 1.4% | 2.6% (0.0–18.6%) n=32,553 | 1.0% (0.0–7.2%) n=932 |
| Single-parent households | 59.3% | 53.6% (37.3–74.1%) n=32,087 | 56.8% (43.7–75.5%) n=928 |
| Population 65+ | 19.3% | 19.4% (10.8–33.6%) n=32,553 | 20.2% (12.7–31.0%) n=932 |
| Median age | 44.9 yr | 42.2 yr (33.0–56.3) n=32,292 | 42.7 yr (34.1–54.7) n=931 |
| Median household income | $72,143 | $72,070 ($46,039–$118,707) n=30,318 | $73,848 ($55,055–$102,762) n=911 |
| Median home value | $218,300 | $222,200 ($100,300–$579,820) n=30,049 | $161,100 ($93,820–$278,170) n=892 |
| Median gross rent | $781 | $1,021 ($677–$1,912) n=25,670 | $825 ($614–$1,113) n=771 |
Life expectancyNCHS / RWJF USALEEP · model-based
| Measure | Value | US median (p10–p90) | IA median (p10–p90) |
|---|---|---|---|
| Life expectancy at birth | 79.9 yr ± 1.08 | 78.9 yr (74.7–82.8) n=31,308 | 80.0 yr (77.2–83.4) n=917 |
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 1.08 years of 79.9, 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