Harrison County leans Republican by roughly 18 points: about 41% of voters vote Democratic and 59% Republican.
About 59% of adults in Harrison County typically vote, near the U.S. average of about 62%. Among adults in Harrison County, ~24% vote Democratic, ~35% Republican, and ~41% don't vote. The map below shows estimated turnout by block group.
How Harrison County compares
Among counties within 50 miles, Harrison County is the least Republican-leaning.
Harrison County runs about 5 points more Democratic than Mississippi as a whole.
Politics vary noticeably by city within Harrison County. The south side runs the most Democratic (D+23) and the northwest side runs the most Republican (R+53), a spread of about 76 points.
Why Harrison 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 Harrison County, not a ranked or complete list of what matters most.
Harrison County votes Republican even though it is densely developed (about 61%, far above the Mississippi average of 15%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; Harrison County, MS 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 Harrison County looks the way it does
Renters vote less often than owners. About 36% of households in Harrison County rent, about 12 points above the U.S. average of 25%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Hancock County, MS R+53
- Jackson County, MS R+30
- Stone County, MS R+57
- Pearl River County, MS R+60
- George County, MS R+78
- St. Tammany Parish, LA R+35
- Mobile County, AL R+8
- Perry County, MS R+58
- Greene County, MS R+53
- Forrest County, MS R+6
Counties with Similar Populations
- Clermont County, OH R+37
- Washington County, PA R+24
- Elkhart County, IN R+28
- Muscogee County, GA D+25
- Benton County, WA R+21
- Richmond County, GA D+41
- Champaign County, IL D+29
- Butte County, CA R+3
- Okaloosa County, FL R+34
- York County, ME R+2
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Sources and methodology
Precinct-level voting records used to fit the model come from Mississippi 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.