Shelby County leans heavily Republican by roughly 32 points: about 34% of voters vote Democratic and 66% Republican.
About 70% of adults in Shelby County typically vote, above the U.S. average of about 62%. Among adults in Shelby County, ~24% vote Democratic, ~46% Republican, and ~30% don't vote. The map below shows estimated turnout by block group.
How Shelby County compares
Among counties within 50 miles, Shelby County leans more Republican than 10 of 28 neighbors.
Politically, Shelby County sits close to the rest of Kentucky.
Politics vary noticeably by city within Shelby County. The southeast side is the most Republican-leaning (R+54) and the west side is the least Republican-leaning (R+24), a spread of about 30 points.
Why Shelby County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Shelby County, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 73% of households in Shelby County are family households, about 6 points above the U.S. average of 67%.
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; Shelby County, KY sits below the national average on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Shelby County looks the way it does
Turnout in Shelby County sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Spencer County, KY R+56
- Henry County, KY R+51
- Oldham County, KY R+23
- Franklin County, KY R+19
- Anderson County, KY R+50
- Jefferson County, KY D+20
- Bullitt County, KY R+48
- Trimble County, KY R+57
- Clark County, IN R+23
- Woodford County, KY R+29
Counties with Similar Populations
- Carter County, OK R+46
- Le Flore County, OK R+63
- Bingham County, ID R+54
- Whitman County, WA D+16
- Crittenden County, AR D+22
- Greene County, NY R+13
- Shelby County, OH R+58
- Boyd County, KY R+38
- Lincoln Parish, LA R+13
- Curry County, NM R+34
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.