| ZIP Codes: | 12 ZIP Codes (10 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Code: | 712 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:11:51 PM |
| Population: | 16,249 [See All] |
| FIPS: | 19047 |
| Land Area: | 678 sq mi |
| Water Area: | 1 sq mi |
| Coordinates: | 42.0514, -95.3589 |
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16,249 residents live across 12 ZIPs covering 678 sq mi, served by 12 distinct USPS-recognized cities.
Population moved from 16,889 to 16,143 from 2014 to 2024 — a -4.4% change. 3 ZIPs gained residents, 7 lost.
The county's wealthiest ZIP 51454 (Manilla, $100,625 median) and poorest ZIP 51441 (Deloit, $48,750) are 15.8 miles apart — a 2.1× income gap across local geography.
Median home values vary 2.1× across this county — from $87,900 in 51439 (Charter Oak) to $183,100 in 51461 (Schleswig).
Density varies 6× across the county — from 9 people/sq mi in 51528 (Dow City) to 60 in 51442 (Denison).
Educational attainment ranges from 3.2% bachelor's+ in 51520 (Arion) to 24.3% in 51441 (Deloit) — the breadth of educational profiles across the area.
Within Iowa, this is the #44 most populous of 99 counties and ranks #74 for median household income .
Weighted by population, the typical household earns about $69,537 across the county — reflecting what a typical resident sees, not a simple ZIP average.
17.1% of adults age 25+ hold a bachelor's degree or higher (1,800 of 10,524 reporting).
10 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.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 51442 | Denison | Standard | 9,692 | $66,767 | 162.7 | -0.6% |
| 51454 | Manilla | Standard | 1,254 | $100,625 | 96.0 | -6.8% |
| 51461 | Schleswig | Standard | 1,097 | $73,768 | 58.7 | -5.3% |
| 51439 | Charter Oak | Standard | 818 | $52,941 | 79.9 | -34.1% |
| 51465 | Vail | Standard | 689 | $72,917 | 60.1 | 3.5% |
| 51528 | Dow City | Standard | 674 | $63,173 | 71.0 | -14.5% |
| 51448 | Kiron | Standard | 612 | $76,058 | 59.9 | 3.4% |
| 51467 | Westside | Standard | 596 | $81,250 | 53.6 | -11.0% |
| 51441 | Deloit | Standard | 468 | $48,750 | 15.0 | 7.3% |
| 51520 | Arion | Standard | 243 | $60,843 | 20.4 | -0.4% |
| 51460 | Ricketts | PO Box | 61 | — | 0.6 | — |
| 51432 | Aspinwall | PO Box | 45 | $61,250 | 0.3 | — |