Fosterburg leans heavily Republican by roughly 42 points: about 29% of voters vote Democratic and 71% Republican.
About 93% of adults in Fosterburg typically vote, above the U.S. average of about 62%. Among adults in Fosterburg, ~27% vote Democratic, ~66% Republican, and ~7% don't vote. The map below shows estimated turnout by block group.
How Fosterburg compares
Among cities within 25 miles, Fosterburg leans more Republican than 90 of 133 neighbors.
Fosterburg runs about 53 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Fosterburg is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Fosterburg. The northwest side is the most Republican-leaning (R+50) and the east side is the least Republican-leaning (R+40), a spread of about 10 points.
Why Fosterburg leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Fosterburg, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 90% of residents in Fosterburg drive to work alone, about 16 points above the U.S. average of 74%. A high family-household share predicts Republican voting, and about 79% of households in Fosterburg are family households, above 87% of cities. Fosterburg runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
High-school completion, uninsured rate, and voter turnout
Places that combine high-school-completion-heavy adults and a low uninsured rate tend to turn out at a higher rate, as Fosterburg, IL does.
Why turnout in Fosterburg looks the way it does
Homeowners vote more often than renters. About 98% of households in Fosterburg own their home, about 18 points above the Illinois average of 80%. High high-school completion lines up with higher turnout, and about 98% of adults in Fosterburg have completed high school, above 96% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Dorsey, IL R+39
- Bethalto, IL R+27
- Cottage Hills, IL R+24
- Moro, IL R+35
- Miles Station, IL R+54
- Rosewood Heights, IL R+30
- Bunker Hill, IL R+47
- Brighton, IL R+47
- East Alton, IL R+20
Cities with Similar Populations
- New Buffalo, OH R+17
- Glenmore, VA R+21
- Estrella, CO R+31
- Knoxlyn, PA R+43
- West Bethel, ME Even
- Phillipston, MA R+15
- Spencerburg, MO R+65
- Evan, MN R+67
- Stoneville, WV R+73
- Jackson, NE R+54
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.