| ZIP Codes: | 8 ZIP Codes (8 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Code: | 319 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:11:55 PM |
| Population: | 24,763 [See All] |
| FIPS: | 19183 |
| CBSA: | Iowa City, IA |
| Land Area: | 633 sq mi |
| Water Area: | 2 sq mi |
| Coordinates: | 41.3578, -91.6934 |
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24,763 residents live across 8 ZIPs covering 633 sq mi, served by 8 distinct USPS-recognized cities.
Population moved from 24,625 to 24,763 from 2014 to 2024 — a +0.6% change. 4 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 52201 (Ainsworth, $93,750 median) and poorest ZIP 52540 (Brighton, $55,000) are 19.2 miles apart — a 1.7× income gap across local geography.
Median home values vary 3.0× across this county — from $98,200 in 52621 (Crawfordsville) to $298,900 in 52247 (Kalona).
Density varies 7× across the county — from 11 people/sq mi in 52540 (Brighton) to 76 in 52247 (Kalona).
Educational attainment ranges from 5.2% bachelor's+ in 52201 (Ainsworth) to 35.1% in 52247 (Kalona) — the breadth of educational profiles across the area.
Within Iowa, this is the #25 most populous of 99 counties and ranks #40 for median household income .
Weighted by population, the typical household earns about $74,594 across the county — reflecting what a typical resident sees, not a simple ZIP average.
26.2% of adults age 25+ hold a bachelor's degree or higher (4,363 of 16,628 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.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 52353 | Washington | Standard | 9,241 | $63,047 | 156.9 | 2.5% |
| 52247 | Kalona | Standard | 5,914 | $91,450 | 78.0 | 5.3% |
| 52327 | Riverside | Standard | 3,796 | $86,942 | 81.4 | 10.7% |
| 52356 | Wellman | Standard | 2,664 | $57,321 | 96.3 | -7.4% |
| 52201 | Ainsworth | Standard | 1,148 | $93,750 | 64.1 | -13.6% |
| 52540 | Brighton | Standard | 1,088 | $55,000 | 98.9 | -20.9% |
| 52621 | Crawfordsville | Standard | 604 | $87,188 | 43.8 | -17.0% |
| 52359 | West Chester | Standard | 308 | $67,727 | 13.3 | 22.2% |