Martin County is a Republican stronghold. About 20% of voters here vote Democratic and 80% Republican.
About 69% of adults in Martin County typically vote, above the U.S. average of about 62%. Among adults in Martin County, ~14% vote Democratic, ~55% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.
How Martin County compares
Among counties within 50 miles, Martin County is the most Republican-leaning.
Martin County runs about 40 points more Republican than Indiana as a whole.
Politics vary noticeably by city within Martin County. The southeast side is the most Republican-leaning (R+65) and the west side is the least Republican-leaning (R+53), a spread of about 12 points.
Why Martin County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Martin County, not a ranked or complete list of what matters most.
Areas with a high white share and below-average college attainment vote Republican. In Martin County, about 95% of residents are non-Hispanic white, about 22 points above the U.S. average of 72%; about 13% of adults hold a bachelor's degree, about 9 points below the Indiana average of 22%.
Renting and voter turnout
Places with homeowner-heavy households tend to turn out at a higher rate; Martin County, IN sits below the national average on this measure.
Why turnout in Martin County looks the way it does
Turnout in Martin County sits close to the national pattern. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Daviess County, IN R+59
- Orange County, IN R+54
- Lawrence County, IN R+51
- Dubois County, IN R+44
- Greene County, IN R+55
- Pike County, IN R+55
- Knox County, IN R+41
- Crawford County, IN R+52
- Monroe County, IN D+29
- Sullivan County, IN R+49
Counties with Similar Populations
- Sac County, IA R+51
- Mountrail County, ND R+35
- Grundy County, MO R+57
- Montgomery County, MS R+2
- Emery County, UT R+73
- Duval County, TX R+10
- Scott County, AR R+70
- Swift County, MN R+35
- Tunica County, MS D+31
- McLean County, ND R+51
Sources and methodology
Precinct-level voting records used to fit the model come from Indiana Secretary of State, Elections, 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.