Marathon County leans Republican by roughly 16 points: about 42% of voters vote Democratic and 58% Republican.
About 84% of adults in Marathon County typically vote, above the U.S. average of about 62%. Among adults in Marathon County, ~35% vote Democratic, ~49% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How Marathon County compares
Among counties within 50 miles, Marathon County leans more Republican than 1 of 6 neighbors.
Marathon County runs about 16 points more Republican than Wisconsin as a whole.
Politics vary noticeably by city within Marathon County. The north side runs the most Democratic (Even) and the northwest side runs the most Republican (R+45), a spread of about 46 points.
Why Marathon County leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Marathon County. The lean here lands roughly where demographic data alone would predict.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; Marathon County, WI sits in the top quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Marathon County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Marathon County is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 68%, about 8 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Lincoln County, WI R+29
- Portage County, WI R+7
- Wood County, WI R+22
- Langlade County, WI R+35
- Taylor County, WI R+46
- Clark County, WI R+43
- Waupaca County, WI R+34
- Shawano County, WI R+35
- Menominee County, WI D+59
- Oneida County, WI R+18
Counties with Similar Populations
- Napa County, CA D+32
- Hampton City, VA D+41
- Florence County, SC Even
- Washington County, WI R+28
- Brunswick County, NC R+29
- Humboldt County, CA D+27
- Monroe County, IN D+29
- Clark County, OH R+21
- Spotsylvania County, VA R+8
- Boone County, KY R+28
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Sources and methodology
Precinct-level voting records used to fit the model come from Wisconsin Elections Commission, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.