37189 leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.
About 79% of adults in 37189 typically vote, above the U.S. average of about 62%. Among adults in 37189, ~43% vote Democratic, ~36% Republican, and ~21% don't vote. The map below shows estimated turnout by block group.
How 37189 compares
Among zip codes within 15 miles, 37189 leans more Democratic than 10 of 29 neighbors.
37189 runs about 40 points more Democratic than Tennessee as a whole. Tennessee leans Republican overall, while 37189 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 37189. The southwest side runs the most Democratic (D+47) and the northwest side runs the most Republican (R+36), a spread of about 83 points.
Why 37189 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 37189, not a ranked or complete list of what matters most.
37189 votes against the grain of Tennessee. Tennessee leans Republican overall, while 37189 runs about 40 points more Democratic. High college attainment predicts Democratic voting, and 37189 sits in the top quarter (about 41%, above 82% of zip codes).
Homeownership and voter turnout
Places with homeowner-heavy households tend to turn out at a higher rate; 37189, TN sits in the top quarter nationally on this measure.
Why turnout in 37189 looks the way it does
Homeowners vote more often than renters. About 90% of households in 37189 own their home, about 12 points above the Tennessee average of 77%. 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.