Marathon County

Also known as Marathon County, Wisconsin, Marathon County, WI

county in Wisconsin, United States

Key facts

Country: United States
State: Wisconsin
Named after: Marathon, Greece
Seat: Wausau
Largest city: Wausau
Total: 1,576 sq mi (4,080 km )
Land: 1,545 sq mi (4,000 km )
Water: 31 sq mi (80 km ) 2.0%
Estimate 2025: 139,432
Density: 89.3/sq mi (34.5/km )
Time zone: UTC−6 ( Central )
Summer dst: UTC−5 ( CDT )
Congressional district

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Article

Wisconsin 1866 US land Office Marathon County Fairgrounds

Marathon County is a county located 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.