Streamwood leans slightly Democratic by roughly 12 points: about 56% of voters vote Democratic and 44% Republican.
About 59% of adults in Streamwood typically vote, near the U.S. average of about 62%. Among adults in Streamwood, ~33% vote Democratic, ~26% Republican, and ~41% don't vote. The map below shows estimated turnout by block group.
How Streamwood compares
Among cities within 25 miles, Streamwood leans more Democratic than 96 of 185 neighbors.
Politically, Streamwood sits close to the rest of Illinois.
Politics vary noticeably by neighborhood within Streamwood. The south side is the most Democratic-leaning (D+15) and the northwest side is the least Democratic-leaning (D+3), a spread of about 12 points.
Why Streamwood 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 Streamwood, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 95% of residents in Streamwood live in densely developed areas, about 59 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 36% of adults in Streamwood have never been married, above 89% of cities.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Streamwood, IL sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Streamwood looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Streamwood is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Crowded housing lines up with lower turnout, and about 5% of homes in Streamwood have more than one occupant per room, above 88% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Hanover Park, IL D+14
- Bartlett, IL D+3
- Hoffman Estates, IL D+15
- Schaumburg, IL D+13
- South Barrington, IL R+7
- Roselle, IL Even
- Elgin, IL D+18
- Bloomingdale, IL Even
- Medinah, IL R+4
- Wayne, IL R+7
Cities with Similar Populations
- Upper Darby, PA D+53
- Bartlesville, OK R+35
- Hope Mills, NC D+4
- Rockledge, FL R+17
- Sherwood, AR Even
- Brownsburg, IN R+14
- Lincoln Park, MI Even
- Bartlett, IL D+3
- Starkville, MS D+6
- Howell, NJ R+25
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.