Mount Prospect, IL Political Map | Democrat & Republican Areas in Mount Prospect

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

Mount Prospect leans slightly Democratic by roughly 12 points: about 56% of voters vote Democratic and 44% Republican.

 

About 70% of adults in Mount Prospect typically vote, above the U.S. average of about 62%. Among adults in Mount Prospect, ~39% vote Democratic, ~31% Republican, and ~30% don't vote. The map below shows estimated turnout by block group.

How Mount Prospect compares

Among cities within 25 miles, Mount Prospect leans more Democratic than 80 of 171 neighbors.

Politically, Mount Prospect sits close to the rest of Illinois.

Politics vary noticeably by neighborhood within Mount Prospect. The north side is the most Democratic-leaning (D+18) and the northeast side is the least Democratic-leaning (D+7), a spread of about 11 points.

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

Dense areas vote Democratic. About 99% of residents in Mount Prospect live in densely developed areas, about 62 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Mount Prospect sits in the top quarter (about 49%, above 93% of cities).

Population density and Democratic lean

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

Why turnout in Mount Prospect looks the way it does

Turnout in Mount Prospect sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. 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.