| ZIP Codes: | 12 ZIP Codes (12 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Codes: | 515 / 641 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:11:53 PM |
| Population: | 36,414 [See All] |
| FIPS: | 19099 |
| CBSA: | Des Moines-West Des Moines, IA |
| Land Area: | 651 sq mi |
| Water Area: | 3 sq mi |
| Coordinates: | 41.6611, -93.0622 |
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36,414 residents live across 12 ZIPs covering 651 sq mi, served by 12 distinct USPS-recognized cities.
Population moved from 35,366 to 36,300 from 2014 to 2024 — a +2.6% change. 7 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 50168 (Mingo, $113,750 median) and poorest ZIP 50208 (Newton, $62,306) are 11.3 miles apart — a 1.8× income gap across local geography.
Median home values vary 1.8× across this county — from $165,200 in 50135 (Kellogg) to $300,000 in 50168 (Mingo).
Density varies 8× across the county — from 15 people/sq mi in 50232 (Reasnor) to 127 in 50208 (Newton).
Educational attainment ranges from 16.5% bachelor's+ in 50135 (Kellogg) to 30.9% in 50228 (Prairie City) — the breadth of educational profiles across the area.
Within Iowa, this is the #18 most populous of 99 counties and ranks #21 for median household income .
Weighted by population, the typical household earns about $72,188 across the county — reflecting what a typical resident sees, not a simple ZIP average.
19.5% of adults age 25+ hold a bachelor's degree or higher (5,018 of 25,724 reporting).
12 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 |
|---|---|---|---|---|---|---|
| 50208 | Newton | Standard | 20,595 | $62,306 | 161.8 | 0.6% |
| 50054 | Colfax | Standard | 3,166 | $89,940 | 64.2 | -2.7% |
| 50170 | Monroe | Standard | 3,024 | $88,704 | 85.0 | 9.2% |
| 50228 | Prairie City | Standard | 2,120 | $90,833 | 70.0 | -5.4% |
| 50028 | Baxter | Standard | 1,981 | $72,022 | 42.4 | 30.1% |
| 50135 | Kellogg | Standard | 1,754 | $65,250 | 74.2 | 6.9% |
| 50251 | Sully | Standard | 1,365 | $91,061 | 42.1 | -0.8% |
| 50153 | Lynnville | Standard | 890 | $73,798 | 33.9 | 14.0% |
| 50168 | Mingo | Standard | 826 | $113,750 | 37.8 | 7.1% |
| 50232 | Reasnor | Standard | 569 | $87,667 | 36.9 | 10.5% |
| 50137 | Killduff | Standard | 114 | — | 2.2 | — |
| 50127 | Ira | Standard | 10 | — | 0.6 | -41.2% |