37115 leans Democratic by roughly 28 points: about 64% of voters vote Democratic and 36% Republican.
About 46% of adults in 37115 typically vote, below the U.S. average of about 62%. Among adults in 37115, ~29% vote Democratic, ~17% Republican, and ~54% don't vote. The map below shows estimated turnout by block group.
How 37115 compares
Among zip codes within 15 miles, 37115 leans more Democratic than 16 of 31 neighbors.
37115 runs about 59 points more Democratic than Tennessee as a whole. Tennessee leans Republican overall, while 37115 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 37115. The east side is the most Democratic-leaning (D+41) and the west side is the least Democratic-leaning (D+19), a spread of about 22 points.
Why 37115 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 37115, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 87% of residents in 37115 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 37115 have never been married, above 87% of zip codes. 37115 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; 37115, TN sits in the top quarter nationally on this measure.
Why turnout in 37115 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 37115 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 55% of households in 37115 rent, about 30 points above the U.S. average of 25%. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
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.