| ZIP Codes: | 10 ZIP Codes (10 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Codes: | 319 / 563 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:11:51 PM |
| Population: | 16,256 [See All] |
| FIPS: | 19055 |
| Land Area: | 542 sq mi |
| Water Area: | 1 sq mi |
| Coordinates: | 42.4913, -91.3782 |
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16,256 residents live across 10 ZIPs covering 542 sq mi, served by 10 distinct USPS-recognized cities.
Population moved from 15,802 to 16,121 from 2014 to 2024 — a +2.0% change. 5 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 52041 (Earlville, $89,697 median) and poorest ZIP 50654 (Masonville, $53,264) are 16.1 miles apart — a 1.7× income gap across local geography.
Median home values vary 2.1× across this county — from $124,100 in 50654 (Masonville) to $260,600 in 52330 (Ryan).
Density varies 55× across the county — from 5 people/sq mi in 50654 (Masonville) to 277 in 52036 (Delaware).
Educational attainment ranges from 8.7% bachelor's+ in 52050 (Greeley) to 38.9% in 52330 (Ryan) — the breadth of educational profiles across the area.
Within Iowa, this is the #43 most populous of 99 counties and ranks #45 for median household income .
Weighted by population, the typical household earns about $74,287 across the county — reflecting what a typical resident sees, not a simple ZIP average.
22.6% of adults age 25+ hold a bachelor's degree or higher (2,557 of 11,298 reporting).
10 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 |
|---|---|---|---|---|---|---|
| 52057 | Manchester | Standard | 8,193 | $69,635 | 139.0 | 6.5% |
| 52237 | Hopkinton | Standard | 1,830 | $84,063 | 83.3 | 40.1% |
| 52041 | Earlville | Standard | 1,468 | $89,697 | 57.8 | -3.9% |
| 52035 | Colesburg | Standard | 1,331 | $62,109 | 47.3 | 17.1% |
| 52223 | Delhi | Standard | 1,199 | $89,250 | 48.3 | -30.4% |
| 52330 | Ryan | Standard | 940 | $86,536 | 44.0 | 6.5% |
| 52038 | Dundee | Standard | 463 | $56,250 | 27.5 | 8.4% |
| 52050 | Greeley | Standard | 422 | $67,206 | 40.2 | -45.0% |
| 50654 | Masonville | Standard | 275 | $53,264 | 54.6 | -18.6% |
| 52036 | Delaware | Standard | 135 | $85,208 | 0.5 | — |