37228 is a Democratic stronghold. About 80% of voters here vote Democratic and 20% Republican.
About 40% of adults in 37228 typically vote, below the U.S. average of about 62%. Among adults in 37228, ~32% vote Democratic, ~8% Republican, and ~60% don't vote. The map below shows estimated turnout by block group.
How 37228 compares
Among zip codes within 15 miles, 37228 leans more Democratic than 29 of 31 neighbors.
37228 runs about 90 points more Democratic than Tennessee as a whole. Tennessee leans Republican overall, while 37228 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 37228. The west side is the most Democratic-leaning (D+71) and the south side is the least Democratic-leaning (D+60), a spread of about 11 points.
Why 37228 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 37228, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 91% of residents in 37228 live in densely developed areas, about 54 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 37228 sits in the top quarter (about 58%, above 93% of zip codes). 37228 runs against the grain of Tennessee, a Democratic-leaning pocket in a Republican-leaning state.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 37228, TN sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 37228 looks the way it does
Renters vote less often than owners. About 96% of households in 37228 rent, about 71 points above the U.S. average of 25%. Limited routine healthcare access lines up with lower turnout, and 37228 sits in the bottom quarter on routine-care measures. High-crime urban areas turn out at lower rates, and 37228 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.