Gwinnett County leans Democratic by roughly 22 points: about 61% of voters vote Democratic and 39% Republican.
About 68% of adults in Gwinnett County typically vote, above the U.S. average of about 62%. Among adults in Gwinnett County, ~41% vote Democratic, ~27% Republican, and ~32% don't vote. The map below shows estimated turnout by block group.
How Gwinnett County compares
Among counties within 50 miles, Gwinnett County leans more Democratic than 22 of 29 neighbors.
Gwinnett County runs about 23 points more Democratic than Georgia as a whole. Georgia is roughly evenly split, and Gwinnett County sits clearly on the Democratic side.
Politics vary noticeably by city within Gwinnett County. The southeast side is the most Democratic-leaning (D+34) and the northeast side is the least Democratic-leaning (Even), a spread of about 33 points.
Why Gwinnett 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 Gwinnett County, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 81% of residents in Gwinnett County live in densely developed areas, about 45 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Gwinnett County sits in the top quarter (about 38%, above 90% of counties). A high never-married share predicts Democratic voting, and about 35% of adults in Gwinnett County have never been married, above 85% of counties.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Gwinnett County, GA sits in the top quarter nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Gwinnett County looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Gwinnett County is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- DeKalb County, GA D+63
- Forsyth County, GA R+22
- Barrow County, GA R+36
- Walton County, GA R+37
- Fulton County, GA D+46
- Rockdale County, GA D+42
- Hall County, GA R+32
- Newton County, GA D+16
- Jackson County, GA R+54
- Cobb County, GA D+20
Counties with Similar Populations
- Bergen County, NJ D+5
- Pinellas County, FL R+3
- Erie County, NY D+15
- Prince George's County, MD D+71
- Milwaukee County, WI D+41
- Marion County, IN D+29
- DuPage County, IL D+14
- Shelby County, TN D+40
- Pierce County, WA D+12
- Duval County, FL D+7
Sources and methodology
Precinct-level voting records used to fit the model come from Georgia Elections Division, 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.