37151 is a Republican stronghold. About 17% of voters here vote Democratic and 83% Republican.
About 81% of adults in 37151 typically vote, above the U.S. average of about 62%. Among adults in 37151, ~14% vote Democratic, ~67% Republican, and ~19% don't vote. The map below shows estimated turnout by block group.
How 37151 compares
Among zip codes within 15 miles, 37151 leans more Republican than 4 of 10 neighbors.
37151 runs about 36 points more Republican than Tennessee as a whole.
Why 37151 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 37151. The lean here lands roughly where demographic data alone would predict.
Population density and Republican lean
Places with low population density tend to lean Republican; 37151, TN sits below the national average on this measure.
Why turnout in 37151 looks the way it does
Homeowners vote more often than renters. About 92% of households in 37151 own their home, about 14 points above the Tennessee average of 77%. High high-school completion lines up with higher turnout, and about 97% of adults in 37151 have completed high school, above 89% of zip codes. 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.