Marathon County is a county in the U.S. state of Wisconsin. As of the 2020 census, the population was 138,013. Its county seat is Wausau. It was founded in 1850, created from a portion of Portage County. At that time the county stretched to the northern border with the Upper Peninsula of Michigan. It is named after the battlefield at Marathon, Greece.
- Country
- United States
- Inception
- 1850
- Website
- http://www.co.marathon.wi.us
