Jefferson Park, Chicago, IL Political Map | Democrat & Republican Areas in Jefferson Park

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

Jefferson Park leans Democratic by roughly 22 points: about 61% of voters vote Democratic and 39% Republican.

 

About 61% of adults in Jefferson Park typically vote, near the U.S. average of about 62%. Among adults in Jefferson Park, ~37% vote Democratic, ~24% Republican, and ~39% don't vote. The map below shows estimated turnout by block group.

How Jefferson Park compares

Among neighborhoods within 5 miles, Jefferson Park leans more Democratic than 9 of 35 neighbors.

Jefferson Park runs about 11 points more Democratic than Illinois as a whole.

Politics vary noticeably by block within Jefferson Park. The east side is the most Democratic-leaning (D+33) and the west side is the least Democratic-leaning (D+7), a spread of about 27 points.

Why Jefferson Park leans the way it does

Density, race composition, education, and family structure all sit close to their national averages in Jefferson Park. The lean here lands roughly where demographic data alone would predict.

Population density and Democratic lean

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

Why turnout in Jefferson Park looks the way it does

Turnout in Jefferson Park 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.

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.