Sangamon County is a true toss-up. About 50% of voters here vote Democratic and 50% Republican.
About 76% of adults in Sangamon County typically vote, above the U.S. average of about 62%. Among adults in Sangamon County, ~38% vote Democratic, ~38% Republican, and ~24% don't vote. The map below shows estimated turnout by block group.
How Sangamon County compares
Among counties within 50 miles, Sangamon County sits roughly in the middle of the political spectrum, with 12 neighbors leaning further in the place's direction and 0 leaning the other way.
Sangamon County runs about 10 points more Republican than Illinois as a whole.
Politics vary noticeably by city within Sangamon County. The west side runs the most Democratic (D+11) and the southeast side runs the most Republican (R+24), a spread of about 35 points.
Why Sangamon County leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Sangamon County. The lean here lands roughly where demographic data alone would predict.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Sangamon County, IL sits in the top tenth 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 Sangamon County looks the way it does
Areas with high high-school completion turn out at higher rates. About 94% of adults in Sangamon County have completed high school, above 85% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Menard County, IL R+41
- Christian County, IL R+45
- Logan County, IL R+41
- Morgan County, IL R+25
- Mason County, IL R+46
- Macon County, IL R+8
- Cass County, IL R+31
- Montgomery County, IL R+44
- Macoupin County, IL R+42
- Scott County, IL R+64
Counties with Similar Populations
- Sumner County, TN R+40
- Minnehaha County, SD R+10
- Racine County, WI D+7
- Hernando County, FL R+33
- Deschutes County, OR D+5
- Broome County, NY D+3
- Livingston County, MI R+23
- Butler County, PA R+28
- Ellis County, TX R+31
- St. Louis County, MN D+12
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Sources and methodology
Precinct-level voting records used to fit the model come from Illinois State Board of 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.