St. Clair County is a Republican stronghold. About 17% of voters here vote Democratic and 83% Republican.
About 75% of adults in St. Clair County typically vote, above the U.S. average of about 62%. Among adults in St. Clair County, ~13% vote Democratic, ~62% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How St. Clair County compares
Among counties within 50 miles, St. Clair County leans more Republican than 8 of 10 neighbors.
St. Clair County runs about 35 points more Republican than Alabama as a whole.
Politics vary noticeably by city within St. Clair County. The east side is the most Republican-leaning (R+77) and the southwest side is the least Republican-leaning (R+54), a spread of about 23 points.
Why St. Clair 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 St. Clair County, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 72% of households in St. Clair County are family households, about 6 points above the U.S. average of 67%.
Park access and Republican lean
Places with low park coverage tend to lean Republican; St. Clair County, AL sits in the bottom quarter nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in St. Clair County looks the way it does
Homeowners vote more often than renters. About 83% of households in St. Clair County own their home, about 5 points above the Alabama average of 78%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Talladega County, AL R+27
- Blount County, AL R+79
- Jefferson County, AL D+20
- Etowah County, AL R+49
- Calhoun County, AL R+35
- Shelby County, AL R+36
- Clay County, AL R+65
- Cullman County, AL R+76
- Marshall County, AL R+64
- Coosa County, AL R+26
Counties with Similar Populations
- Rockingham County, NC R+31
- Grafton County, NH D+18
- Wayne County, NY R+23
- Victoria County, TX R+28
- Frederick County, VA R+25
- Ozaukee County, WI R+7
- Mendocino County, CA D+23
- Liberty County, TX R+50
- Northumberland County, PA R+39
- Nassau County, FL R+47
All Local Stats
Home Services
Sources and methodology
Precinct-level voting records used to fit the model come from Alabama Secretary of State, 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.