St. Charles Parish leans Republican by roughly 24 points: about 38% of voters vote Democratic and 62% Republican.
About 73% of adults in St. Charles Parish typically vote, above the U.S. average of about 62%. Among adults in St. Charles Parish, ~28% vote Democratic, ~45% Republican, and ~27% don't vote. The map below shows estimated turnout by block group.
How St. Charles Parish compares
Among counties within 50 miles, St. Charles Parish leans more Republican than 5 of 13 neighbors.
Politically, St. Charles Parish sits close to the rest of Louisiana.
Politics vary noticeably by city within St. Charles Parish. The south side runs the most Democratic (D+14) and the southwest side runs the most Republican (R+71), a spread of about 85 points.
Why St. Charles Parish 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. Charles Parish, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 84% of residents in St. Charles Parish drive to work alone, about 10 points above the U.S. average of 74%. A high family-household share predicts Republican voting, and about 72% of households in St. Charles Parish are family households, above 88% of counties.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; St. Charles Parish, LA sits in the top quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in St. Charles Parish looks the way it does
Areas with strong routine healthcare access turn out at higher rates. St. Charles Parish 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 63%, above 68% of counties. Homeowners vote more often than renters, and about 82% of households in St. Charles Parish own their home, above 88% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- St. John the Baptist Parish, LA D+27
- Jefferson Parish, LA D+4
- Orleans Parish, LA D+63
- St. James Parish, LA D+3
- Lafourche Parish, LA R+55
- St. Bernard Parish, LA R+14
- Terrebonne Parish, LA R+42
- Plaquemines Parish, LA R+27
- St. Tammany Parish, LA R+35
- Ascension Parish, LA R+32
Counties with Similar Populations
- Culpeper County, VA R+23
- Grundy County, IL R+26
- Jackson County, AL R+71
- Columbia County, OR R+18
- Kerr County, TX R+45
- Navarro County, TX R+34
- Worcester County, MD R+12
- Washington County, OK R+40
- Ashland County, OH R+50
- Calumet County, WI R+23
Sources and methodology
Precinct-level voting records used to fit the model come from Louisiana 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.