County ProfileIL
Winnebago County
Population: 285,350 · 28 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
285,350
People
Median age
39.6
Housing
Total households
116,014
Income
Median household income
$65,837
Housing
Total housing units
125,002
Employment
Employment rate
57%
Education
Bachelor’s degree or higher
25.2%
Healthcare
Insured population
93.8%
County details
Local time 02:16:29(CT)| Name | Winnebago |
|---|---|
| Total ZIP codes | 28total |
| ZIP codes (by type) | 18 Standard10 PO Box |
| Area code | 779, 815 |
| Timezone | Central Time (CT) |
| Coordinates | 42.3373957, -89.1612053 |
| Land area | 513 sq miles(1,328.8 km²) |
Map of Winnebago county, Illinois with ZIP codes
Cities and Communities in Winnebago County
Compare the largest cities in Winnebago County by population, median income, and growth. Use the table below to analyze key demographic shifts across the region.
| City | Population | Median incomeHousehold | ZIP codes |
|---|---|---|---|
| Rockford | 148,655 | $54,752 | 14ZIPs |
| Loves Park | 23,397 | $61,868 | 4ZIPs |
| Machesney Park | 22,950 | $75,489 | 1ZIPs |
| Roscoe | 10,983 | $93,036 | 1ZIPs |
| South Beloit | 7,989 | $78,616 | 1ZIPs |
| Rockton | 7,863 | $119,058 | 1ZIPs |
| Winnebago | 2,940 | $92,614 | 1ZIPs |
| Cherry Valley | 2,905 | $74,655 | 1ZIPs |
| Pecatonica | 2,090 | $73,162 | 1ZIPs |
| Durand | 1,390 | $65,688 | 1ZIPs |
| Shirland | 226 | — | 1ZIPs |
| Seward | 74 | — | 1ZIPs |
— Data unavailable or suppressed by the U.S. Census Bureau for areas with small sample sizes to protect individual privacy.
ZIP Codes in Winnebago County
Review the most populated postal areas across Winnebago County. Use the ranking below to compare resident density and demographic scales between the county's major zones.
| ZIP | City | Median incomeHousehold | Population (ZIP) |
|---|---|---|---|
| 61107 | Rockford | $78,574 | 30,722 |
| 61108 | Rockford | $64,415 | 29,660 |
| 61109 | Rockford | $62,973 | 26,958 |
| 61103 | Rockford | $51,161 | 23,294 |
| 61111 | Loves Park | $61,393 | 23,028 |
| 61115 | Machesney Park | $75,363 | 22,599 |
| 61073 | Roscoe | $102,064 | 19,936 |
| 61101 | Rockford | $46,163 | 19,784 |
| 61104 | Rockford | $33,772 | 17,354 |
| 61102 | Rockford | $46,599 | 17,281 |
| 61114 | Rockford | $85,568 | 15,569 |
| 61072 | Rockton | $104,938 | 11,259 |
| 61080 | South Beloit | $76,579 | 11,252 |
| 61088 | Winnebago | $98,088 | 5,966 |
| 61016 | Cherry Valley | $84,883 | 4,738 |
| 61063 | Pecatonica | $84,276 | 3,901 |
| 61024 | Durand | $70,750 | 2,456 |
| 61079 | Shirland | $46,367 | 226 |
| 61112 | Rockford | $40,563 | 139 |
| 61077 | Seward | — | 74 |
Data Sources & Citations
The geographic and demographic information presented on this site is compiled from publicly available, authoritative sources, including:
- United States Census BureauDemographic, population, housing, and socioeconomic data sourced from Census Bureau datasets, including the Decennial Census and the American Community Survey (ACS).Census Data
- United States Postal Service (USPS)ZIP code classifications, delivery types, and postal designations used for reference purposes. USPS ZIP codes are intended for mail delivery and may not always align exactly with Census geographic boundaries.USPS