Lombard, IL Political Map | Democrat & Republican Areas in Lombard

By the BestNeighborhood data science team. Last updated May 2026.

Lombard leans slightly Democratic by roughly 14 points: about 57% of voters vote Democratic and 43% Republican.

 

About 73% of adults in Lombard typically vote, above the U.S. average of about 62%. Among adults in Lombard, ~42% vote Democratic, ~31% Republican, and ~27% don't vote. The map below shows estimated turnout by block group.

How Lombard compares

Among cities within 25 miles, Lombard leans more Democratic than 94 of 175 neighbors.

Politically, Lombard sits close to the rest of Illinois.

Politics vary noticeably by neighborhood within Lombard. The south side is the most Democratic-leaning (D+19) and the northeast side is the least Democratic-leaning (D+7), a spread of about 13 points.

Why Lombard 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 Lombard, not a ranked or complete list of what matters most.

Dense areas vote Democratic. About 98% of residents in Lombard live in densely developed areas, about 62 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Lombard sits in the top quarter (about 48%, above 93% of cities). A high never-married share predicts Democratic voting, and about 33% of adults in Lombard have never been married, above 82% of cities.

Walkability and Democratic lean

Places with a highly walkable street grid tend to lean Democratic; Lombard, 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 Lombard looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Lombard is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 69%, about 9 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in Lombard have completed high school, above 83% of cities. Learn more about the findings and methodology on the political spectrum map.

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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.