Oldham County leans Republican by roughly 22 points: about 39% of voters vote Democratic and 61% Republican.
About 85% of adults in Oldham County typically vote, above the U.S. average of about 62%. Among adults in Oldham County, ~33% vote Democratic, ~52% Republican, and ~15% don't vote. The map below shows estimated turnout by block group.
How Oldham County compares
Among counties within 50 miles, Oldham County leans more Republican than 3 of 26 neighbors.
Oldham County runs about 8 points more Democratic than Kentucky as a whole.
Politics vary noticeably by city within Oldham County. The southeast side is the most Republican-leaning (R+35) and the southwest side is the least Republican-leaning (R+15), a spread of about 20 points.
Why Oldham 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 Oldham County, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 81% of households in Oldham County are family households, about 15 points above the U.S. average of 67%.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; Oldham County, KY sits in the top tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Oldham County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Oldham County is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 69%, about 9 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 86% of households in Oldham County own their home, above 96% of counties. High high-school completion lines up with higher turnout, and about 95% of adults in Oldham County have completed high school, above 91% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Clark County, IN R+23
- Henry County, KY R+51
- Shelby County, KY R+32
- Jefferson County, KY D+20
- Trimble County, KY R+57
- Floyd County, IN R+18
- Spencer County, KY R+56
- Bullitt County, KY R+48
- Jefferson County, IN R+43
- Carroll County, KY R+51
Counties with Similar Populations
- Walker County, GA R+61
- Laurens County, SC R+35
- Carteret County, NC R+35
- Butler County, KS R+41
- Otero County, NM R+19
- Catoosa County, GA R+54
- McCracken County, KY R+30
- Spalding County, GA R+8
- Jefferson County, AR D+22
- Jones County, MS R+32
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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.