| ZIP Codes: | 14 ZIP Codes (12 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 779 / 815 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:53:21 PM |
| Population: | 44,964 [See All] |
| FIPS: | 17177 |
| CBSA: | Freeport, IL |
| Land Area: | 576 sq mi |
| Water Area: | 1 sq mi |
| Coordinates: | 42.3666, -89.6608 |
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44,964 residents live across 14 ZIPs covering 576 sq mi, served by 14 distinct USPS-recognized cities.
Population moved from 48,271 to 44,964 from 2014 to 2024 — a -6.9% change. 4 ZIPs gained residents, 10 lost.
The county's wealthiest ZIP 61019 (Davis, $105,150 median) and poorest ZIP 61032 (Freeport, $56,593) are 14.8 miles apart — a 1.9× income gap across local geography.
Median home values vary 2.1× across this county — from $112,300 in 61032 (Freeport) to $232,100 in 61019 (Davis).
Density varies 389× across the county — from 13 people/sq mi in 61089 (Winslow) to 5,077 in 61013 (Cedarville).
Educational attainment ranges from 7.4% bachelor's+ in 61067 (Ridott) to 38.4% in 61039 (German Valley) — the breadth of educational profiles across the area.
Within Illinois, this is the #33 most populous of 102 counties and ranks #37 for median household income .
Weighted by population, the typical household earns about $66,020 across the county — reflecting what a typical resident sees, not a simple ZIP average.
21.0% of adults age 25+ hold a bachelor's degree or higher (6,743 of 32,167 reporting).
12 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.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
Stephenson 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 |
|---|---|---|---|---|---|---|
| 61032 | Freeport | Standard | 29,020 | $56,593 | 150.1 | -7.1% |
| 61048 | Lena | Standard | 3,786 | $82,875 | 86.2 | -8.4% |
| 61019 | Davis | Standard | 3,461 | $105,150 | 37.9 | -0.1% |
| 61062 | Pearl City | Standard | 1,840 | $66,667 | 73.8 | -13.1% |
| 61060 | Orangeville | Standard | 1,554 | $76,726 | 37.6 | 3.5% |
| 61070 | Rock City | Standard | 1,322 | $84,167 | 31.9 | -0.4% |
| 61018 | Dakota | Standard | 1,034 | $76,471 | 32.2 | -5.2% |
| 61039 | German Valley | Standard | 824 | $84,107 | 29.0 | -8.2% |
| 61013 | Cedarville | PO Box | 690 | $67,569 | 0.1 | 35.3% |
| 61089 | Winslow | Standard | 526 | $66,250 | 40.3 | -31.8% |
| 61067 | Ridott | Standard | 450 | $66,563 | 30.4 | -31.6% |
| 61044 | Kent | Standard | 225 | $82,083 | 14.0 | 70.5% |
| 61050 | Mc Connell | Standard | 199 | $74,728 | 12.3 | -51.5% |
| 61027 | Eleroy | PO Box | 33 | — | 0.0 | 312.5% |