| ZIP Codes: | 8 ZIP Codes (8 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Code: | 712 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:11:51 PM |
| Population: | 13,872 [See All] |
| FIPS: | 19029 |
| Land Area: | 671 sq mi |
| Water Area: | 1 sq mi |
| Coordinates: | 41.3439, -94.9657 |
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13,872 residents live across 8 ZIPs covering 671 sq mi, served by 8 distinct USPS-recognized cities.
Population moved from 14,220 to 13,872 from 2014 to 2024 — a -2.4% change. 1 ZIPs gained residents, 7 lost.
The county's wealthiest ZIP 51552 (Marne, $90,000 median) and poorest ZIP 51544 (Lewis, $48,313) are 11.9 miles apart — a 1.9× income gap across local geography.
Median home values vary 2.1× across this county — from $81,000 in 51544 (Lewis) to $169,100 in 50853 (Massena).
Density varies 11× across the county — from 5 people/sq mi in 51552 (Marne) to 51 in 50022 (Atlantic).
Educational attainment ranges from 11.0% bachelor's+ in 51552 (Marne) to 24.9% in 50022 (Atlantic) — the breadth of educational profiles across the area.
Within Iowa, this is the #57 most populous of 99 counties and ranks #79 for median household income .
Weighted by population, the typical household earns about $65,266 across the county — reflecting what a typical resident sees, not a simple ZIP average.
22.3% of adults age 25+ hold a bachelor's degree or higher (2,175 of 9,733 reporting).
8 Standard delivery, 0 PO Box only, 0 single-entity Unique ZIPs serve this county.
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 50022 | Atlantic | Standard | 8,526 | $63,125 | 167.3 | 5.0% |
| 51535 | Griswold | Standard | 1,697 | $76,371 | 131.2 | -10.7% |
| 50020 | Anita | Standard | 1,197 | $75,417 | 96.5 | -11.1% |
| 51544 | Lewis | Standard | 793 | $48,313 | 51.2 | -8.9% |
| 50853 | Massena | Standard | 716 | $65,208 | 73.7 | -1.8% |
| 50843 | Cumberland | Standard | 540 | $56,125 | 68.6 | -17.1% |
| 50274 | Wiota | Standard | 234 | $71,667 | 46.5 | -27.8% |
| 51552 | Marne | Standard | 169 | $90,000 | 36.4 | -39.9% |