Massac County leans heavily Republican by roughly 46 points: about 27% of voters vote Democratic and 73% Republican.
About 72% of adults in Massac County typically vote, above the U.S. average of about 62%. Among adults in Massac County, ~19% vote Democratic, ~53% Republican, and ~28% don't vote. The map below shows estimated turnout by block group.
How Massac County compares
Among counties within 50 miles, Massac County leans more Republican than 10 of 24 neighbors.
Massac County runs about 57 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Massac County is one of the few Republican-leaning pockets.
Politics vary noticeably by city within Massac County. The northeast side is the most Republican-leaning (R+66) and the south side is the least Republican-leaning (R+24), a spread of about 41 points.
Why Massac 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 Massac County, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 85% of residents in Massac County drive to work alone, about 12 points above the U.S. average of 74%. Low college attainment predicts Republican voting, and Massac County sits in the bottom quarter (about 17%, below 75% of counties). Massac County runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Cancer-screening access and voter turnout
Places with low colon-cancer-screening access tend to turn out at a lower rate; Massac County, IL sits in the bottom quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Massac County looks the way it does
Turnout in Massac County sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- McCracken County, KY R+30
- Ballard County, KY R+62
- Pope County, IL R+60
- Livingston County, KY R+64
- Johnson County, IL R+41
- Pulaski County, IL R+26
- Carlisle County, KY R+69
- Marshall County, KY R+57
- Graves County, KY R+57
- Hardin County, IL R+57
Counties with Similar Populations
- Claiborne Parish, LA R+11
- Estill County, KY R+63
- O'Brien County, IA R+54
- Cedar County, MO R+65
- Rusk County, WI R+38
- Gulf County, FL R+56
- Franklin County, ID R+77
- Atoka County, OK R+69
- Choctaw County, OK R+54
- Smith County, MS R+59
All Local Stats
Home Services
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.