37404 is a Democratic stronghold. About 75% of voters here vote Democratic and 25% Republican.
About 43% of adults in 37404 typically vote, below the U.S. average of about 62%. Among adults in 37404, ~32% vote Democratic, ~11% Republican, and ~57% don't vote. The map below shows estimated turnout by block group.
How 37404 compares
Among zip codes within 15 miles, 37404 leans more Democratic than 29 of 31 neighbors.
37404 runs about 80 points more Democratic than Tennessee as a whole. Tennessee leans Republican overall, while 37404 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 37404. The northeast side is the most Democratic-leaning (D+75) and the southwest side is the least Democratic-leaning (D+33), a spread of about 42 points.
Why 37404 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 37404, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 98% of residents in 37404 live in densely developed areas, about 62 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 49% of adults in 37404 have never been married, above 95% of zip codes. 37404 runs against the grain of Tennessee, a Democratic-leaning pocket in a Republican-leaning state.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; 37404, TN sits in the bottom tenth nationally 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 37404 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 37404 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 46%, about 10 points below the Tennessee average of 56%. Renters vote less often than owners, and about 58% of households in 37404 rent, about 33 points above the U.S. average of 25%. High-crime urban areas turn out at lower rates, and 37404 sits in the top 15% on a violent-crime measure. 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.