| ZIP Codes: | 13 ZIP Codes (11 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Code: | 641 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:53:11 PM |
| Population: | 39,902 [See All] |
| FIPS: | 19127 |
| CBSA: | Marshalltown, IA |
| Land Area: | 593 sq mi |
| Water Area: | 1 sq mi |
| Coordinates: | 42.0068, -92.9987 |
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39,902 residents live across 13 ZIPs covering 593 sq mi, served by 13 distinct USPS-recognized cities.
Population moved from 40,563 to 39,902 from 2014 to 2024 — a -1.6% change. 5 ZIPs gained residents, 8 lost.
The county's wealthiest ZIP 50239 (Saint Anthony, $151,250 median) and poorest ZIP 50051 (Clemons, $60,000) are 3.0 miles apart — a 2.5× income gap across local geography.
Median home values vary 3.6× across this county — from $97,200 in 50148 (Liscomb) to $354,200 in 50239 (Saint Anthony).
Density varies 92× across the county — from 8 people/sq mi in 50051 (Clemons) to 727 in 50142 (Le Grand).
Educational attainment ranges from 8.8% bachelor's+ in 50005 (Albion) to 39.4% in 50247 (State Center) — the breadth of educational profiles across the area.
Within Iowa, this is the #15 most populous of 99 counties and ranks #10 for median household income .
Weighted by population, the typical household earns about $74,370 across the county — reflecting what a typical resident sees, not a simple ZIP average.
22.0% of adults age 25+ hold a bachelor's degree or higher (5,803 of 26,319 reporting).
11 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.
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 |
|---|---|---|---|---|---|---|
| 50158 | Marshalltown | Standard | 31,396 | $70,367 | 209.4 | -0.8% |
| 50247 | State Center | Standard | 2,004 | $91,875 | 85.1 | -10.7% |
| 50162 | Melbourne | Standard | 1,164 | $71,417 | 50.5 | -16.7% |
| 50106 | Gilman | Standard | 1,163 | $101,193 | 64.2 | 11.6% |
| 50005 | Albion | Standard | 812 | $76,696 | 27.3 | 17.7% |
| 50142 | Le Grand | PO Box | 720 | $76,250 | 1.0 | -24.2% |
| 50141 | Laurel | Standard | 587 | $77,500 | 33.6 | -8.9% |
| 50234 | Rhodes | Standard | 559 | $78,750 | 30.6 | -8.7% |
| 50120 | Haverhill | Standard | 428 | $142,662 | 19.6 | 38.1% |
| 50148 | Liscomb | Standard | 406 | $84,083 | 21.3 | 3.3% |
| 50239 | Saint Anthony | Standard | 354 | $151,250 | 21.8 | 119.9% |
| 50051 | Clemons | Standard | 224 | $60,000 | 28.2 | -40.6% |
| 50078 | Ferguson | PO Box | 85 | $52,500 | 0.2 | -21.3% |