40921 is a Republican stronghold. About 12% of voters here vote Democratic and 88% Republican.
About 53% of adults in 40921 typically vote, below the U.S. average of about 62%. Among adults in 40921, ~6% vote Democratic, ~47% Republican, and ~47% don't vote. The map below shows estimated turnout by block group.
How 40921 compares
Among zip codes within 15 miles, 40921 leans more Republican than 10 of 19 neighbors.
40921 runs about 45 points more Republican than Kentucky as a whole.
Why 40921 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 40921, not a ranked or complete list of what matters most.
Areas with a high white share and below-average college attainment vote Republican. In 40921, more than 99% of residents are non-Hispanic white, about 28 points above the U.S. average of 72%; about 8% of adults hold a bachelor's degree, about 11 points below the Kentucky average of 19%. Rural areas vote Republican, and 40921 sits in the bottom quarter on density (about 4%, below 86% of zip codes).
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; 40921, KY 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 40921 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 40921 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 8 points below the Kentucky average of 54%. 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.