Marathon County Flag

Marathon County

State:
Wisconsin
County Seat:
Wausau

Marathon County's estimated 2025 population is 139,926 with a growth rate of 0.47% in the past year according to the most recent United States census data. Marathon County is the 10th largest county in Wisconsin. The 2010 population was 134,064 and has seen a growth of 4.37% since that time.

139,926
Total Population
91
Population Density (mi²)
10
Population Rank (State)
657 0.47%
Annual Population Growth

Marathon County Population

Demographics

Economics and Income Statistics