Glendale Heights, IL Political Map | Democrat & Republican Areas in Glendale Heights

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

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

 

About 51% of adults in Glendale Heights typically vote, below the U.S. average of about 62%. Among adults in Glendale Heights, ~29% vote Democratic, ~22% Republican, and ~49% don't vote. The map below shows estimated turnout by block group.

How Glendale Heights compares

Among cities within 25 miles, Glendale Heights leans more Democratic than 107 of 182 neighbors.

Politically, Glendale Heights sits close to the rest of Illinois.

Politics vary noticeably by neighborhood within Glendale Heights. The northeast side is the most Democratic-leaning (D+21) and the northwest side is the least Democratic-leaning (D+10), a spread of about 11 points.

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

Dense areas vote Democratic. About 98% of residents in Glendale Heights live in densely developed areas, about 62 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 39% of adults in Glendale Heights have never been married, above 93% of cities.

Population density and Democratic lean

Places with high population density tend to lean Democratic; Glendale Heights, IL sits in the top tenth nationally on this measure.

Why turnout in Glendale Heights looks the way it does

Areas with limited routine healthcare access turn out at lower rates. Glendale Heights 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 31% of households in Glendale Heights rent, above 85% of cities. Crowded housing lines up with lower turnout, and about 6% of homes in Glendale Heights have more than one occupant per room, above 91% 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.