Addison is a true toss-up. About 52% of voters here vote Democratic and 48% Republican.
About 54% of adults in Addison typically vote, below the U.S. average of about 62%. Among adults in Addison, ~28% vote Democratic, ~26% Republican, and ~46% don't vote. The map below shows estimated turnout by block group.
How Addison compares
Among cities within 25 miles, Addison leans more Democratic than 57 of 177 neighbors.
Addison runs about 8 points more Republican than Illinois as a whole.
Politics vary noticeably by neighborhood within Addison. The south side runs the most Democratic (D+11) and the northeast side runs the most Republican (R+15), a spread of about 26 points.
Why Addison leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Addison. The lean here lands roughly where demographic data alone would predict.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Addison, IL sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in Addison looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Addison is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 32% of households in Addison rent, above 87% of cities. High food insecurity lines up with lower turnout, and about 20% of adults in Addison report food insecurity, above 80% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Wood Dale, IL R+6
- Itasca, IL R+6
- Bensenville, IL D+8
- Villa Park, IL D+17
- Medinah, IL R+4
- Glendale Heights, IL D+14
- Elmhurst, IL D+18
- Bloomingdale, IL Even
- Lombard, IL D+14
- Elk Grove Village, IL D+3
Cities with Similar Populations
- Cibolo, TX R+11
- West Babylon, NY R+7
- Stow, OH Even
- Willis, TX R+43
- Pacifica, CA D+43
- Lewiston, ME D+9
- Altadena, CA D+59
- Fenton, MI R+20
- Bay Shore, NY D+7
- Gurnee, IL D+22
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.