Madison leans Democratic by roughly 30 points: about 65% of voters vote Democratic and 35% Republican.
About 46% of adults in Madison typically vote, below the U.S. average of about 62%. Among adults in Madison, ~30% vote Democratic, ~16% Republican, and ~54% don't vote. The map below shows estimated turnout by block group.
How Madison compares
Among cities within 25 miles, Madison is the most Democratic-leaning.
Madison runs about 59 points more Democratic than Tennessee as a whole. Tennessee leans Republican overall, while Madison is one of the few Democratic-leaning pockets.
Politics vary noticeably by neighborhood within Madison. The east side is the most Democratic-leaning (D+38) and the west side is the least Democratic-leaning (D+18), a spread of about 20 points.
Why Madison leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Madison, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 87% of residents in Madison live in densely developed areas, about 51 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 40% of adults in Madison have never been married, above 93% of cities. Madison runs against the grain of Tennessee, a Democratic-leaning pocket in a Republican-leaning state.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Madison, TN sits in the top tenth nationally on this measure.
Why turnout in Madison looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Madison is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 56% of households in Madison rent, compared to around 30% in nearby cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Lakewood, TN R+10
- Goodlettsville, TN R+8
- Old Hickory, TN R+18
- Whites Creek, TN D+21
- Hendersonville, TN R+33
- Hermitage, TN D+10
- Green Hill, TN R+39
- Millersville, TN R+46
- Nashville, TN R+13
- Berry Hill, TN D+27
Cities with Similar Populations
- Ringgold, GA R+57
- La Vergne, TN D+6
- Willowbrook, CA D+54
- Glen Ellyn, IL D+22
- Maricopa, AZ R+9
- Bettendorf, IA D+5
- Pearl City, HI D+17
- Royal Palm Beach, FL D+7
- Canal Winchester, OH D+17
- Fort Lee, NJ D+16
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Sources and methodology
Precinct-level voting records used to fit the model come from Tennessee Secretary of State, Division of 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.