37303 is a Republican stronghold. About 23% of voters here vote Democratic and 77% Republican.
About 65% of adults in 37303 typically vote, near the U.S. average of about 62%. Among adults in 37303, ~15% vote Democratic, ~50% Republican, and ~35% don't vote. The map below shows estimated turnout by block group.
How 37303 compares
Among zip codes within 15 miles, 37303 is the least Republican-leaning.
37303 runs about 25 points more Republican than Tennessee as a whole.
Politics vary noticeably by block within 37303. The northwest side is the most Republican-leaning (R+69) and the east side is the least Republican-leaning (R+41), a spread of about 29 points.
Why 37303 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 37303, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 83% of residents in 37303 drive to work alone, about 9 points above the U.S. average of 74%.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; 37303, TN sits below the national average on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 37303 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 37303 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. 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.