| ZIP Codes: | 9 ZIP Codes (8 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Codes: | 779 / 815 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:01 PM |
| Population: | 21,563 [See All] |
| FIPS: | 17085 |
| Land Area: | 588 sq mi |
| Water Area: | 18 sq mi |
| Coordinates: | 42.4036, -90.2065 |
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21,563 residents live across 9 ZIPs covering 588 sq mi, served by 9 distinct USPS-recognized cities.
Population moved from 22,143 to 21,563 from 2014 to 2024 — a -2.6% change. 3 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 61028 (Elizabeth, $86,053 median) and poorest ZIP 61041 (Hanover, $45,938) are 7.9 miles apart — a 1.9× income gap across local geography.
Median home values vary 3.3× across this county — from $92,000 in 61059 (Nora) to $300,300 in 61001 (Apple River).
Density varies 1524× across the county — from 16 people/sq mi in 61028 (Elizabeth) to 23,733 in 61059 (Nora).
Educational attainment ranges from 15.0% bachelor's+ in 61075 (Scales Mound) to 43.8% in 61036 (Galena) — the breadth of educational profiles across the area.
Within Illinois, this is the #54 most populous of 102 counties and ranks #57 for median household income .
Weighted by population, the typical household earns about $73,484 across the county — reflecting what a typical resident sees, not a simple ZIP average.
28.7% of adults age 25+ hold a bachelor's degree or higher (4,712 of 16,446 reporting).
8 Standard delivery, 1 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 |
|---|---|---|---|---|---|---|
| 61036 | Galena | Standard | 7,121 | $81,989 | 107.9 | 5.8% |
| 61025 | East Dubuque | Standard | 4,294 | $70,739 | 39.3 | -9.6% |
| 61085 | Stockton | Standard | 3,149 | $59,798 | 128.9 | -10.3% |
| 61028 | Elizabeth | Standard | 1,683 | $86,053 | 108.1 | -15.1% |
| 61087 | Warren | Standard | 1,588 | $77,321 | 29.0 | -6.1% |
| 61041 | Hanover | Standard | 1,338 | $45,938 | 83.1 | 25.2% |
| 61001 | Apple River | Standard | 1,226 | $77,841 | 37.2 | -0.2% |
| 61075 | Scales Mound | Standard | 986 | $75,547 | 55.0 | -2.7% |
| 61059 | Nora | PO Box | 178 | $54,113 | 0.0 | 6.6% |