Marathon County, Wisconsin

Marathon County
Marathon County Courthouse in Wausau
Location within the U.S. state of Wisconsin
Wisconsin's location within the U.S.
Coordinates: 44°54′N 89°46′W / 44.9°N 89.76°W / 44.9; -89.76
Country United States
State Wisconsin
Founded1850
Named afterMarathon, Greece
SeatWausau
Largest cityWausau
Area
  Total
1,576 sq mi (4,080 km2)
  Land1,545 sq mi (4,000 km2)
  Water31 sq mi (80 km2)  2.0%
Population
 (2020)
  Total
138,013
  Estimate 
(2023)
138,612
  Density89.3/sq mi (34.5/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district7th
Websitewww.co.marathon.wi.us

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.

Marathon County comprises the Wausau, WI Metropolitan Statistical Area and is included in the Wausau–Stevens PointWisconsin Rapids, WI Combined Statistical Area.