Winnebago County, Illinois
Winnebago County is a county in Illinois. Its county FIPS code is 17201. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 17201
- Representative coordinates
- 42.337396, -89.161205
- County type
- County
- County seat or government
- Rockford
- Resident population, July 2025
- 283,674
- Land area
- 1,328.789 km²
- Water area
- 15.877 km²
- State
- Illinois
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in Winnebago County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| America/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Listed zones overlap the mapped area. A point lookup can distinguish sides of a boundary. Your device’s zone may differ.
Census ZIP areas
61008 · 61011 · 61016 · 61019 · 61020 · 61024 · 61047 · 61063 · 61072 · 61073 · 61077 · 61079 · 61080 · 61084 · 61088 · 61101 · 61102 · 61103 · 61104 · 61107 · 61108 · 61109 · 61111 · 61112 · 61114 · 61115
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Official county information
Winnebago County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Cities, towns and communities
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
Areas sharing the mapped boundary
These areas touch this mapped boundary.
Before using this answer on a form
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Find the county at your current point, check its ZIP area, or find its physical time zone.