Columbia County
Also known as Columbia County, Wisconsin, Columbia County, WI
county in Wisconsin, United States
Key facts
- Country
- United States
- State
- Wisconsin
- Named after
- Columbia
- Seat
- Portage
- Largest city
- Portage
- Total
- 796 sq mi (2,060 km )
- Land
- 766 sq mi (1,980 km )
- Water
- 30 sq mi (78 km ) 3.8%
- Estimate 2025
- 58,132
- Density
- 76.4/sq mi (29.5/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
- Congressional district
- 6th
~7 min read
Article
Columbia County is a county located in the U.S. state of Wisconsin. As of the 2020 census, the population was 58,490. Its county seat and largest city is Portage. The county was created in 1846 as part of Wisconsin Territory. Columbia County is part of the Madison, WI Metropolitan Statistical Area as well as the Madison-Janesville-Beloit, WI Combined Statistical Area.
Geography