Jerome leans Democratic by roughly 16 points: about 58% of voters vote Democratic and 42% Republican.
About 60% of adults in Jerome typically vote, near the U.S. average of about 62%. Among adults in Jerome, ~35% vote Democratic, ~25% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.
How Jerome compares
Among cities within 25 miles, Jerome leans more Democratic than 70 of 71 neighbors.
Jerome runs about 5 points more Democratic than Illinois as a whole.
Politics vary noticeably by neighborhood within Jerome. The north side is the most Democratic-leaning (D+31) and the west side is the least Democratic-leaning (D+2), a spread of about 28 points.
Why Jerome 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 Jerome, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in Jerome live in densely developed areas, about 64 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 43% of adults in Jerome have never been married, above 96% of cities.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Jerome, IL sits in the top tenth nationally on this measure.
Why turnout in Jerome looks the way it does
Renters vote less often than owners. About 38% of households in Jerome rent, about 13 points above the U.S. average of 25%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Leland Grove, IL D+26
- Springfield, IL D+14
- Southern View, IL R+6
- Bradfordton, IL R+19
- Curran, IL R+28
- Archer, IL R+27
- Chatham, IL R+9
- Clear Lake, IL R+31
- Rochester, IL R+27
Cities with Similar Populations
- San Mateo, FL R+59
- Garrison, ND R+58
- Hamburg, OH R+48
- Rapidan, VA R+37
- Cleveland, NY R+29
- Fleming, GA R+7
- Wilder, KY R+18
- Hustisford, WI R+42
- Kirbyville, MO R+65
- Hoyt, KS R+46
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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.