| ZIP Codes: | 15 ZIP Codes (12 Standard, 3 PO Box, 0 Unique) [See All] |
| Area Codes: | 217 / 447 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:00 PM |
| Population: | 16,910 [See All] |
| FIPS: | 17067 |
| Land Area: | 801 sq mi |
| Water Area: | 27 sq mi |
| Coordinates: | 40.3993, -91.1944 |
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16,910 residents live across 15 ZIPs covering 801 sq mi, served by 15 distinct USPS-recognized cities.
Population moved from 18,167 to 16,910 from 2014 to 2024 — a -6.9% change. 5 ZIPs gained residents, 9 lost.
The county's wealthiest ZIP 62373 (Sutter, $110,568 median) and poorest ZIP 62334 (Elvaston, $38,750) are 11.7 miles apart — a 2.9× income gap across local geography.
Median home values vary 2.1× across this county — from $77,100 in 62336 (Ferris ) to $164,900 in 62358 (Niota).
Density varies 37× across the county — from 5 people/sq mi in 62373 (Sutter) to 183 in 62334 (Elvaston).
Educational attainment ranges from 3.1% bachelor's+ in 62334 (Elvaston) to 59.5% in 62373 (Sutter) — the breadth of educational profiles across the area.
Within Illinois, this is the #61 most populous of 102 counties and ranks #70 for median household income .
Weighted by population, the typical household earns about $66,697 across the county — reflecting what a typical resident sees, not a simple ZIP average.
25.7% of adults age 25+ hold a bachelor's degree or higher (3,137 of 12,202 reporting).
12 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.
Hancock County lost 6.9% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 62321 | Carthage | Standard | 3,576 | $76,825 | 175.9 | -8.4% |
| 62341 | Hamilton | Standard | 3,433 | $62,262 | 50.7 | -3.0% |
| 62379 | Warsaw | Standard | 1,854 | $62,200 | 106.5 | 1.7% |
| 61450 | La Harpe | Standard | 1,812 | $59,688 | 73.4 | -2.2% |
| 62330 | Dallas City | Standard | 1,472 | $61,042 | 87.0 | -16.6% |
| 62354 | Nauvoo | Standard | 1,447 | $72,788 | 42.3 | -14.1% |
| 62311 | Augusta | Standard | 872 | $47,794 | 48.2 | 9.7% |
| 62316 | Bowen | Standard | 705 | $61,094 | 43.0 | -3.3% |
| 62358 | Niota | Standard | 525 | $62,216 | 50.6 | -41.3% |
| 62313 | Basco | Standard | 382 | $108,646 | 39.1 | 59.8% |
| 62380 | West Point | Standard | 360 | $75,000 | 38.7 | -2.7% |
| 62373 | Sutter | Standard | 225 | $110,568 | 45.1 | -43.2% |
| 62334 | Elvaston | PO Box | 163 | $38,750 | 0.9 | 56.7% |
| 62336 | Ferris | PO Box | 84 | $43,125 | 0.0 | 18.3% |
| 62329 | Colusa | PO Box | — | — | 0.0 | — |