| ZIP Codes: | 9 ZIP Codes (7 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Code: | 712 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:53:09 PM |
| Population: | 15,999 [See All] |
| FIPS: | 19041 |
| CBSA: | Spencer, IA |
| Land Area: | 502 sq mi |
| Water Area: | 2 sq mi |
| Coordinates: | 43.0868, -95.1599 |
| Quick Link: |
15,999 residents live across 9 ZIPs covering 502 sq mi, served by 9 distinct USPS-recognized cities.
Population moved from 16,353 to 15,924 from 2014 to 2024 — a -2.6% change. 1 ZIPs gained residents, 7 lost.
The county's wealthiest ZIP 51333 (Dickens, $110,833 median) and poorest ZIP 51338 (Everly, $57,500) are 16.7 miles apart — a 1.9× income gap across local geography.
Median home values vary 2.0× across this county — from $98,800 in 51343 (Greenville) to $195,600 in 51333 (Dickens).
Density varies 20× across the county — from 4 people/sq mi in 51366 (Webb) to 77 in 51301 (Spencer).
Educational attainment ranges from 5.9% bachelor's+ in 51343 (Greenville) to 30.5% in 51047 (Peterson) — the breadth of educational profiles across the area.
Within Iowa, this is the #46 most populous of 99 counties and ranks #26 for median household income .
Weighted by population, the typical household earns about $66,578 across the county — reflecting what a typical resident sees, not a simple ZIP average.
27.6% of adults age 25+ hold a bachelor's degree or higher (3,069 of 11,136 reporting).
7 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 |
|---|---|---|---|---|---|---|
| 51301 | Spencer | Standard | 12,638 | $63,402 | 164.4 | -2.1% |
| 51357 | Royal | Standard | 910 | $68,333 | 36.6 | 14.2% |
| 51338 | Everly | Standard | 852 | $57,500 | 66.8 | -6.7% |
| 51047 | Peterson | Standard | 693 | $101,000 | 75.3 | -0.7% |
| 51333 | Dickens | Standard | 374 | $110,833 | 70.9 | -5.3% |
| 51366 | Webb | Standard | 245 | $87,500 | 63.0 | -31.0% |
| 51343 | Greenville | Standard | 172 | $60,625 | 24.3 | -22.5% |
| 51340 | Fostoria | PO Box | 75 | $90,250 | 0.3 | — |
| 51341 | Gillett Grove | PO Box | 40 | — | 0.2 | -41.2% |