| ZIP Codes: | 16 ZIP Codes (14 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 309 / 779 / 815 / 861 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:53:18 PM |
| Population: | 47,370 [See All] |
| FIPS: | 17073 |
| CBSA: | Davenport-Moline-Rock Island, IA-IL |
| Land Area: | 766 sq mi |
| Water Area: | 2 sq mi |
| Coordinates: | 41.3231, -90.1849 |
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47,370 residents live across 16 ZIPs covering 766 sq mi, served by 16 distinct USPS-recognized cities.
Population moved from 48,785 to 47,089 from 2014 to 2024 — a -3.5% change. 2 ZIPs gained residents, 13 lost.
The county's wealthiest ZIP 61273 (Orion, $99,032 median) and poorest ZIP 61443 (Kewanee, $52,615) are 24.8 miles apart — a 1.9× income gap across local geography.
Median home values vary 3.1× across this county — from $79,600 in 61443 (Kewanee) to $244,700 in 61262 (Lynn Center).
Density varies 15× across the county — from 21 people/sq mi in 61234 (Annawan) to 314 in 61241 (Colona).
Educational attainment ranges from 15.4% bachelor's+ in 61235 (Atkinson) to 37.0% in 61254 (Geneseo) — the breadth of educational profiles across the area.
Within Illinois, this is the #30 most populous of 102 counties and ranks #64 for median household income .
Weighted by population, the typical household earns about $73,177 across the county — reflecting what a typical resident sees, not a simple ZIP average.
24.2% of adults age 25+ hold a bachelor's degree or higher (8,210 of 33,905 reporting).
14 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 |
|---|---|---|---|---|---|---|
| 61443 | Kewanee | Standard | 13,456 | $52,615 | 99.9 | -3.0% |
| 61254 | Geneseo | Standard | 12,135 | $92,297 | 166.6 | 7.7% |
| 61241 | Colona | Standard | 6,587 | $80,000 | 21.0 | -2.7% |
| 61273 | Orion | Standard | 3,120 | $99,032 | 46.1 | -6.3% |
| 61434 | Galva | Standard | 2,971 | $56,780 | 83.7 | -7.7% |
| 61238 | Cambridge | Standard | 2,549 | $64,583 | 102.1 | -16.6% |
| 61235 | Atkinson | Standard | 1,283 | $61,932 | 52.5 | -10.8% |
| 61262 | Lynn Center | Standard | 1,197 | $86,250 | 43.4 | -6.3% |
| 61234 | Annawan | Standard | 1,116 | $79,688 | 53.2 | -18.6% |
| 61490 | Woodhull | Standard | 1,035 | $65,625 | 39.5 | -28.3% |
| 61413 | Alpha | Standard | 1,035 | $73,125 | 29.6 | 10.0% |
| 61233 | Andover | PO Box | 281 | $71,667 | 1.0 | — |
| 61274 | Osco | Standard | 197 | $72,000 | 25.0 | -22.4% |
| 61258 | Hooppole | Standard | 182 | $44,261 | 0.4 | -37.9% |
| 61419 | Bishop Hill | PO Box | 134 | $56,429 | 0.5 | -2.2% |
| 61468 | Ophiem | Standard | 92 | $42,969 | 1.1 | -27.6% |