Cook County leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 71% of adults in Cook County typically vote, above the U.S. average of about 62%. Among adults in Cook County, ~23% vote Democratic, ~48% Republican, and ~29% don't vote. The map below shows estimated turnout by block group.
How Cook County compares
Among counties within 50 miles, Cook County leans more Republican than 8 of 17 neighbors.
Cook County runs about 32 points more Republican than Georgia as a whole.
Politics vary noticeably by city within Cook County. The south side runs the most Democratic (D+30) and the southwest side runs the most Republican (R+75), a spread of about 106 points.
Why Cook 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 Cook County, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 82% of residents in Cook County drive to work alone, about 8 points above the U.S. average of 74%.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; Cook County, GA sits in the bottom quarter 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 Cook County looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Cook 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
- Berrien County, GA R+66
- Colquitt County, GA R+36
- Lanier County, GA R+43
- Lowndes County, GA Even
- Tift County, GA R+22
- Brooks County, GA R+23
- Irwin County, GA R+43
- Atkinson County, GA R+57
- Thomas County, GA R+18
- Echols County, GA R+66
Counties with Similar Populations
- Bristol City, VA R+32
- Manassas Park City, VA D+19
- Union County, IL R+48
- Ben Hill County, GA R+17
- Park County, MT R+14
- Sharp County, AR R+62
- Humboldt County, NV R+53
- Richland County, WI R+19
- Arkansas County, AR R+33
- Henry County, AL R+45
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.