Oakbrook Terrace, IL Political Map | Democrat & Republican Areas in Oakbrook Terrace

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

Oakbrook Terrace leans Democratic by roughly 16 points: about 58% of voters vote Democratic and 42% Republican.

 

About 62% of adults in Oakbrook Terrace typically vote, near the U.S. average of about 62%. Among adults in Oakbrook Terrace, ~36% vote Democratic, ~26% Republican, and ~38% don't vote. The map below shows estimated turnout by block group.

How Oakbrook Terrace compares

Among cities within 25 miles, Oakbrook Terrace leans more Democratic than 98 of 175 neighbors.

Oakbrook Terrace runs about 4 points more Democratic than Illinois as a whole.

Politics vary noticeably by neighborhood within Oakbrook Terrace. The west side runs the most Democratic (D+32) and the northeast side runs the most Republican (R+3), a spread of about 35 points.

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

Dense areas vote Democratic. More than 99% of residents in Oakbrook Terrace live in densely developed areas, about 63 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Oakbrook Terrace sits in the top quarter (about 49%, above 93% of cities). A high never-married share predicts Democratic voting, and about 42% of adults in Oakbrook Terrace have never been married, above 95% of cities.

Paved land cover and Democratic lean

Places with extensive paved surfaces tend to lean Democratic; Oakbrook Terrace, 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 Oakbrook Terrace looks the way it does

Renters vote less often than owners. About 49% of households in Oakbrook Terrace rent, about 24 points above the U.S. average of 25%. Crowded housing lines up with lower turnout, and about 4% of homes in Oakbrook Terrace have more than one occupant per room, above 83% of cities. Learn more about the findings and methodology on the political spectrum map.

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.