| ZIP Codes: | 7 ZIP Codes (6 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Code: | 319 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:11:53 PM |
| Population: | 10,279 [See All] |
| FIPS: | 19115 |
| Land Area: | 442 sq mi |
| Water Area: | 16 sq mi |
| Coordinates: | 41.2188, -91.2390 |
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10,279 residents live across 7 ZIPs covering 442 sq mi, served by 7 distinct USPS-recognized cities.
Population moved from 11,228 to 10,279 from 2014 to 2024 — a -8.5% change. 1 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 52754 (Letts, $104,250 median) and poorest ZIP 52752 (Grandview, $49,545) are 5.9 miles apart — a 2.1× income gap across local geography.
Median home values vary 1.7× across this county — from $111,600 in 52737 (Columbus City) to $194,300 in 52754 (Letts).
Density varies 422× across the county — from 4 people/sq mi in 52646 (Oakville) to 1,785 in 52752 (Grandview).
Educational attainment ranges from 1.7% bachelor's+ in 52646 (Oakville) to 22.2% in 52738 (Columbus Junction) — the breadth of educational profiles across the area.
Within Iowa, this is the #73 most populous of 99 counties and ranks #35 for median household income .
Weighted by population, the typical household earns about $81,943 across the county — reflecting what a typical resident sees, not a simple ZIP average.
17.3% of adults age 25+ hold a bachelor's degree or higher (1,277 of 7,392 reporting).
6 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 52738 | Columbus Junction | Standard | 3,398 | $80,385 | 125.2 | -4.9% |
| 52653 | Wapello | Standard | 3,083 | $83,525 | 114.2 | -12.0% |
| 52754 | Letts | Standard | 1,533 | $104,250 | 77.4 | 16.0% |
| 52640 | Morning Sun | Standard | 1,274 | $67,813 | 64.8 | -20.4% |
| 52752 | Grandview | PO Box | 413 | $49,545 | 0.2 | -10.8% |
| 52737 | Columbus City | Standard | 323 | $89,875 | 0.2 | -22.5% |
| 52646 | Oakville | Standard | 255 | $62,500 | 60.3 | -27.1% |