| ZIP Codes: | 15 ZIP Codes (13 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 319 / 641 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:11:53 PM |
| Population: | 10,795 [See All] |
| FIPS: | 19107 |
| Land Area: | 711 sq mi |
| Water Area: | 1 sq mi |
| Coordinates: | 41.3416, -92.2037 |
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10,795 residents live across 15 ZIPs covering 711 sq mi, served by 15 distinct USPS-recognized cities.
Population moved from 11,225 to 10,663 from 2014 to 2024 — a -5.0% change. 4 ZIPs gained residents, 9 lost.
The county's wealthiest ZIP 52563 (Hedrick, $98,438 median) and poorest ZIP 52568 (Martinsburg, $44,375) are 1.9 miles apart — a 2.2× income gap across local geography.
Median home values vary 3.7× across this county — from $66,300 in 52568 (Martinsburg) to $242,400 in 52231 (Harper).
Density varies 82× across the county — from 7 people/sq mi in 50104 (Gibson) to 561 in 52568 (Martinsburg).
Educational attainment ranges from 0.7% bachelor's+ in 52576 (Ollie) to 27.2% in 52585 (Richland) — the breadth of educational profiles across the area.
Within Iowa, this is the #70 most populous of 99 counties and ranks #88 for median household income .
Weighted by population, the typical household earns about $71,662 across the county — reflecting what a typical resident sees, not a simple ZIP average.
18.4% of adults age 25+ hold a bachelor's degree or higher (1,383 of 7,525 reporting).
13 Standard delivery, 2 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.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 52591 | Sigourney | Standard | 2,721 | $62,404 | 124.0 | -17.6% |
| 52248 | Keota | Standard | 1,675 | $77,174 | 111.8 | -6.9% |
| 52563 | Hedrick | Standard | 1,602 | $98,438 | 112.5 | -4.1% |
| 50268 | What Cheer | Standard | 908 | $59,118 | 50.0 | -3.7% |
| 52585 | Richland | Standard | 838 | $75,809 | 54.2 | -9.5% |
| 52335 | South English | Standard | 644 | $52,162 | 45.5 | 16.5% |
| 52550 | Delta | Standard | 552 | $57,745 | 37.8 | 14.3% |
| 52231 | Harper | Standard | 539 | $90,893 | 35.4 | 112.2% |
| 50136 | Keswick | Standard | 376 | $75,625 | 39.1 | 10.3% |
| 52576 | Ollie | Standard | 371 | $63,750 | 46.8 | -17.4% |
| 52355 | Webster | Standard | 283 | $63,750 | 37.9 | -4.7% |
| 50104 | Gibson | Standard | 103 | $55,625 | 15.1 | -17.6% |
| 52568 | Martinsburg | PO Box | 80 | $44,375 | 0.1 | — |
| 52562 | Hayesville | Standard | 52 | — | 0.2 | — |
| 50255 | Thornburg | PO Box | 51 | $39,722 | 0.1 | -38.6% |