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.
Data after 2023 is projected based on recent change
The racial composition of Marathon County includes 87.91% White, 5.52% Asian, and smaller percentages for other race, Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 121,370 | 87.91% |
| Asian | 7,619 | 5.52% |
| Two or more races | 6,089 | 4.41% |
| Other race | 2,034 | 1.47% |
| Black or African American | 656 | 0.48% |
| Native American | 228 | 0.17% |
| Native Hawaiian or Pacific Islander | 71 | 0.05% |
Married
Widowed
Divorced
Separated
Never Married
Marathon County's average per capita income is $49,335. Household income levels show a median of $76,185. The poverty rate stands at 8.91%.
Name | Median | Mean |
|---|---|---|
| Married Families | $104,110 | $124,277 |
| Families | $94,793 | $113,962 |
| Households | $76,185 | $95,540 |
| Non Families | $42,261 | $56,926 |
Average Income
Median Household Income
Poverty Rate
