40121 leans slightly Republican by roughly 14 points: about 43% of voters vote Democratic and 57% Republican.
About 50% of adults in 40121 typically vote, below the U.S. average of about 62%. Among adults in 40121, ~21% vote Democratic, ~28% Republican, and ~51% don't vote. The map below shows estimated turnout by block group.
How 40121 compares
Among zip codes within 15 miles, 40121 leans more Republican than 1 of 11 neighbors.
40121 runs about 17 points more Democratic than Kentucky as a whole.
Politics vary noticeably by block within 40121. The southwest side is the most Republican-leaning (R+25) and the southeast side is the least Republican-leaning (R+9), a spread of about 16 points.
Why 40121 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 40121, not a ranked or complete list of what matters most.
40121 votes Republican even though it is densely developed (about 62%, far above the Kentucky average of 18%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Homeownership and voter turnout
Places with renter-heavy households tend to turn out at a lower rate; 40121, KY sits in the bottom tenth nationally on this measure.
Why turnout in 40121 looks the way it does
Renters vote less often than owners. More than 99% of households in 40121 rent, about 75 points above the U.S. average of 25%. 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 Kentucky State Board 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.