| ZIP Codes: | 9 ZIP Codes (8 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Code: | 641 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:11:53 PM |
| Population: | 20,715 [See All] |
| FIPS: | 19123 |
| CBSA: | Oskaloosa, IA |
| Land Area: | 472 sq mi |
| Water Area: | 2 sq mi |
| Coordinates: | 41.3155, -92.5782 |
| Quick Link: |
20,715 residents live across 9 ZIPs covering 472 sq mi, served by 9 distinct USPS-recognized cities.
Population moved from 20,968 to 20,715 from 2014 to 2024 — a -1.2% change. 4 ZIPs gained residents, 5 lost.
The county's wealthiest ZIP 50143 (Leighton, $86,023 median) and poorest ZIP 50027 (Barnes City, $52,976) are 19.8 miles apart — a 1.6× income gap across local geography.
Median home values vary 4.2× across this county — from $75,700 in 52534 (Beacon) to $314,600 in 50143 (Leighton).
Density varies 220× across the county — from 5 people/sq mi in 50027 (Barnes City) to 1,156 in 52595 (University Park).
Educational attainment ranges from 6.3% bachelor's+ in 50027 (Barnes City) to 35.8% in 50143 (Leighton) — the breadth of educational profiles across the area.
Within Iowa, this is the #32 most populous of 99 counties and ranks #76 for median household income .
Weighted by population, the typical household earns about $68,132 across the county — reflecting what a typical resident sees, not a simple ZIP average.
24.5% of adults age 25+ hold a bachelor's degree or higher (3,351 of 13,703 reporting).
8 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.
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 |
|---|---|---|---|---|---|---|
| 52577 | Oskaloosa | Standard | 14,585 | $66,084 | 158.7 | -3.0% |
| 50207 | New Sharon | Standard | 2,325 | $76,053 | 140.7 | -3.2% |
| 52561 | Fremont | Standard | 1,112 | $76,058 | 39.2 | 21.8% |
| 52586 | Rose Hill | Standard | 600 | $53,125 | 44.4 | 63.9% |
| 52595 | University Park | PO Box | 545 | $66,667 | 0.5 | 10.8% |
| 52543 | Cedar | Standard | 541 | $83,511 | 22.0 | -0.4% |
| 50143 | Leighton | Standard | 538 | $86,023 | 37.5 | -23.6% |
| 52534 | Beacon | Standard | 321 | $57,986 | 0.7 | 53.6% |
| 50027 | Barnes City | Standard | 148 | $52,976 | 28.2 | -50.2% |