St. Croix County, Wisconsin
St. Croix County is a county in Wisconsin. Its county FIPS code is 55109. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 55109
- Representative coordinates
- 45.028959, -92.447284
- County type
- County
- County seat or government
- Hudson
- Resident population, July 2025
- 98,276
- Land area
- 1,870.38 km²
- Water area
- 33.74 km²
- State
- Wisconsin
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in St. Croix 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
54002 · 54005 · 54007 · 54013 · 54015 · 54016 · 54017 · 54020 · 54022 · 54023 · 54025 · 54026 · 54027 · 54028 · 54082 · 54734 · 54749 · 54767
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Official county information
Use the US government local-office directory ↗ to find the office responsible for your address. A county website has not been confidently matched here. 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.
- Baldwin village, WI
- Deer Park village, WI
- Emerald CDP, WI
- Glenwood City city, WI
- Hammond village, WI
- Houlton CDP, WI
- Hudson city, WI
- New Richmond city, WI
- North Hudson village, WI
- River Falls city, WI
- Roberts village, WI
- Somerset village, WI
- Spring Valley village, WI
- Star Prairie village, WI
- Wilson village, WI
- Woodville village, WI
Areas sharing the mapped boundary
These areas touch this mapped boundary.
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county at your current point, check its ZIP area, or find its physical time zone.