| ZIP Codes: | 14 ZIP Codes (11 Standard, 3 PO Box, 0 Unique) [See All] |
| Area Codes: | 779 / 815 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:01 PM |
| Population: | 34,166 [See All] |
| FIPS: | 17103 |
| CBSA: | Dixon, IL |
| Land Area: | 699 sq mi |
| Water Area: | 4 sq mi |
| Coordinates: | 41.7598, -89.2483 |
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34,166 residents live across 14 ZIPs covering 699 sq mi, served by 14 distinct USPS-recognized cities.
Population moved from 35,710 to 34,166 from 2014 to 2024 — a -4.3% change. 3 ZIPs gained residents, 10 lost (and 1 held flat).
The county's wealthiest ZIP 60553 (Steward, $109,375 median) and poorest ZIP 61367 (Sublette, $60,824) are 17.2 miles apart — a 1.8× income gap across local geography.
Median home values vary 2.7× across this county — from $97,200 in 61318 (Compton) to $264,500 in 60530 (Lee).
Density varies 23× across the county — from 6 people/sq mi in 61042 (Harmon) to 144 in 61021 (Dixon).
Educational attainment ranges from 8.9% bachelor's+ in 61318 (Compton) to 30.6% in 60553 (Steward) — the breadth of educational profiles across the area.
Within Illinois, this is the #40 most populous of 102 counties and ranks #36 for median household income .
Weighted by population, the typical household earns about $71,280 across the county — reflecting what a typical resident sees, not a simple ZIP average.
20.0% of adults age 25+ hold a bachelor's degree or higher (5,041 of 25,174 reporting).
11 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.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 61021 | Dixon | Standard | 22,308 | $69,127 | 155.0 | -2.7% |
| 61310 | Amboy | Standard | 3,347 | $69,756 | 117.0 | -14.0% |
| 61006 | Ashton | Standard | 1,541 | $75,938 | 69.5 | -8.8% |
| 61031 | Franklin Grove | Standard | 1,492 | $75,446 | 43.8 | -9.0% |
| 61353 | Paw Paw | Standard | 1,282 | $66,719 | 34.8 | -3.0% |
| 60530 | Lee | Standard | 992 | $96,250 | 29.7 | 78.4% |
| 61367 | Sublette | Standard | 843 | $60,824 | 47.8 | 10.8% |
| 60553 | Steward | Standard | 722 | $109,375 | 49.4 | -16.4% |
| 61318 | Compton | Standard | 595 | $63,021 | 33.4 | -30.0% |
| 61378 | West Brooklyn | Standard | 513 | $85,350 | 55.4 | -5.0% |
| 61042 | Harmon | Standard | 404 | $70,833 | 63.3 | -12.4% |
| 61324 | Eldena | PO Box | 97 | — | 0.3 | 70.2% |
| 61057 | Nachusa | PO Box | 30 | — | 0.0 | -80.0% |
| 61331 | Lee Center | PO Box | 0 | — | 0.0 | — |