Wisconsin Counties Directory & Interactive Map
Complete official guide to all 72 counties in Wisconsin (WI). Explore 2024 US Census population estimates, county seats, FIPS codes, land areas, and interactive mapping tools powered by GeoMap Suite.
Wisconsin County Breakdown
Showing 8 of 8 documented counties and seats.
County Name | FIPS | County Seat | Population (Census) | Land Area | Quick Tool |
|---|---|---|---|---|---|
| Milwaukee County | 55079 | Milwaukee | 939,489 | 241 sq mi | Lookup |
| Dane County (Madison) | 55025 | Madison | 561,504 | 1,197 sq mi | Lookup |
| Waukesha County | 55133 | Waukesha | 406,978 | 550 sq mi | Lookup |
| Brown County (Green Bay) | 55009 | Green Bay | 268,740 | 530 sq mi | Lookup |
| Racine County | 55101 | Racine | 197,727 | 333 sq mi | Lookup |
| Outagamie County (Appleton) | 55087 | Appleton | 187,993 | 638 sq mi | Lookup |
| Winnebago County (Oshkosh) | 55139 | Oshkosh | 171,735 | 434 sq mi | Lookup |
| Kenosha County | 55059 | Kenosha | 169,151 | 272 sq mi | Lookup |
Geographic Structure of Wisconsin Counties
County Administration & Governance
In Wisconsin, county governments manage vital public infrastructure, tax assessments, law enforcement, judicial courts, election administration, and public records. The county seat (Milwaukee and other municipal headquarters) houses the primary courthouse, commissioners, and sheriff’s department.
All Wisconsin counties carry a unique 5-digit Federal Information Processing Standard (FIPS) code, where the first two digits (55) designate the state and the remaining three digits identify each specific jurisdiction.
Geographic & Demographic Highlights
- Most Populous County:Milwaukee County (939,489 residents)
- Largest by Land Area:Dane County (Madison) (1,197 sq mi)
- State Capital:Madison
- Census Bureau Region:Midwest United States
Demographic calculations derive from the United States Census Bureau 2024 Population Estimates Program (PEP) and TIGER/Line geographic boundary files.