37813 is a Republican stronghold. About 25% of voters here vote Democratic and 75% Republican.
About 54% of adults in 37813 typically vote, below the U.S. average of about 62%. Among adults in 37813, ~13% vote Democratic, ~41% Republican, and ~46% don't vote. The map below shows estimated turnout by block group.
How 37813 compares
Among zip codes within 15 miles, 37813 leans more Republican than 1 of 14 neighbors.
37813 runs about 20 points more Republican than Tennessee as a whole.
Politics vary noticeably by block within 37813. The south side is the most Republican-leaning (R+67) and the north side is the least Republican-leaning (R+32), a spread of about 36 points.
Why 37813 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 37813. The lean here lands roughly where demographic data alone would predict.
High-school completion, developed land, and voter turnout
Places that combine low high-school-completion share and a heavily developed built environment tend to turn out at a lower rate, as 37813, TN does.
Why turnout in 37813 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 37813 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 47%, about 9 points below the Tennessee average of 56%. Low high-school completion lines up with lower turnout, and about 85% of adults in 37813 have completed high school, below 82% 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.