| ZIP Codes: | 12 ZIP Codes (9 Standard, 3 PO Box, 0 Unique) [See All] |
| Area Code: | 319 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:53:10 PM |
| Population: | 15,981 [See All] |
| FIPS: | 19095 |
| Land Area: | 571 sq mi |
| Water Area: | 1 sq mi |
| Coordinates: | 41.6957, -92.0314 |
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15,981 residents live across 12 ZIPs covering 571 sq mi, served by 12 distinct USPS-recognized cities.
Population moved from 16,153 to 15,981 from 2014 to 2024 — a -1.1% change. 4 ZIPs gained residents, 8 lost.
The county's wealthiest ZIP 52203 (Amana, $101,950 median) and poorest ZIP 52316 (North English, $60,768) are 22.7 miles apart — a 1.7× income gap across local geography.
Median home values vary 2.8× across this county — from $106,500 in 52308 (Millersburg) to $297,100 in 52203 (Amana).
Density varies 129× across the county — from 8 people/sq mi in 52334 (South Amana) to 1,058 in 52308 (Millersburg).
Educational attainment ranges from 8.0% bachelor's+ in 52251 (Ladora) to 51.8% in 52220 (Conroy) — the breadth of educational profiles across the area.
Within Iowa, this is the #47 most populous of 99 counties and ranks #43 for median household income .
Weighted by population, the typical household earns about $73,185 across the county — reflecting what a typical resident sees, not a simple ZIP average.
25.6% of adults age 25+ hold a bachelor's degree or higher (2,862 of 11,183 reporting).
9 Standard delivery, 3 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 |
|---|---|---|---|---|---|---|
| 52361 | Williamsburg | Standard | 4,582 | $60,992 | 123.9 | -0.8% |
| 52301 | Marengo | Standard | 4,028 | $70,150 | 133.9 | 11.4% |
| 52203 | Amana | Standard | 2,231 | $101,950 | 41.4 | 14.0% |
| 52316 | North English | Standard | 1,597 | $60,768 | 78.7 | 5.8% |
| 52347 | Victor | Standard | 1,386 | $78,482 | 62.1 | -8.3% |
| 52236 | Homestead | Standard | 564 | $87,958 | 26.3 | -18.5% |
| 52251 | Ladora | Standard | 544 | $87,708 | 40.8 | -6.0% |
| 52325 | Parnell | Standard | 477 | $75,714 | 40.2 | -48.5% |
| 52220 | Conroy | PO Box | 199 | — | 0.8 | -36.4% |
| 52334 | South Amana | Standard | 181 | — | 22.0 | -17.7% |
| 52308 | Millersburg | PO Box | 129 | $79,688 | 0.1 | -19.9% |
| 52307 | Middle Amana | PO Box | 63 | $43,388 | 0.5 | 21.2% |