Smithfield leans heavily Republican by roughly 50 points: about 25% of voters vote Democratic and 75% Republican.
About 79% of adults in Smithfield typically vote, above the U.S. average of about 62%. Among adults in Smithfield, ~20% vote Democratic, ~59% Republican, and ~21% don't vote. The map below shows estimated turnout by block group.
How Smithfield compares
Among cities within 25 miles, Smithfield leans more Republican than 47 of 64 neighbors.
Smithfield runs about 61 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Smithfield is one of the few Republican-leaning pockets.
Why Smithfield 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 Smithfield, not a ranked or complete list of what matters most.
Smithfield votes against the grain of Illinois. Illinois leans Democratic overall, while Smithfield runs about 61 points more Republican.
Population density and Republican lean
Places with low population density tend to lean Republican; Smithfield, IL sits in the bottom quarter nationally on this measure.
Why turnout in Smithfield looks the way it does
Turnout in Smithfield 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 Cities
- Seville, IL R+49
- Cuba, IL R+38
- Marietta, IL R+50
- Fiatt, IL R+41
- Ellisville, IL R+51
- New Philadelphia, IL R+50
- Lewistown, IL R+41
- Ipava, IL R+50
- Bryant, IL R+43
- Table Grove, IL R+51
Cities with Similar Populations
- Paincourtville, LA D+11
- Lorane, IN R+56
- Modesto, IL R+59
- Hallwood, GA R+52
- Raleigh, IL R+63
- Lake Tanglewood, TX R+72
- Forestburgh, NY R+3
- Marysville, MT R+42
- Mount Garland, VA R+32
- Morseville, MI R+32
All Local Stats
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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.