Winthrop Harbor, IL Political Map | Democrat & Republican Areas in Winthrop Harbor

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

Winthrop Harbor is a true toss-up. About 49% of voters here vote Democratic and 51% Republican.

 

About 76% of adults in Winthrop Harbor typically vote, above the U.S. average of about 62%. Among adults in Winthrop Harbor, ~37% vote Democratic, ~39% Republican, and ~24% don't vote. The map below shows estimated turnout by block group.

How Winthrop Harbor compares

Among cities within 25 miles, Winthrop Harbor sits roughly in the middle of the political spectrum, with 54 neighbors leaning further in the place's direction and 40 leaning the other way.

Winthrop Harbor runs about 14 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Winthrop Harbor sits closer to the political middle.

Politics vary noticeably by neighborhood within Winthrop Harbor. The southwest side runs the most Democratic (D+9) and the southeast side runs the most Republican (R+18), a spread of about 27 points.

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

Winthrop Harbor votes against the grain of Illinois. Illinois leans Democratic overall, while Winthrop Harbor runs about 14 points more Republican.

Population density and Democratic lean

Places with high population density tend to lean Democratic; Winthrop Harbor, IL sits in the top quarter nationally on this measure.

Why turnout in Winthrop Harbor looks the way it does

Areas with high high-school completion turn out at higher rates. About 96% of adults in Winthrop Harbor have completed high school, about 6 points above the U.S. average of 90%. 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.