South Lyon, MI Political Map | Democrat & Republican Areas in South Lyon

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

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

 

About 98% of adults in South Lyon typically vote, above the U.S. average of about 62%. Among adults in South Lyon, ~42% vote Democratic, ~56% Republican, and ~2% don't vote. The map below shows estimated turnout by block group.

How South Lyon compares

Among cities within 25 miles, South Lyon leans more Republican than 53 of 77 neighbors.

South Lyon runs about 12 points more Republican than Michigan as a whole.

Politics vary noticeably by neighborhood within South Lyon. The northwest side is the most Republican-leaning (R+21) and the south side is the least Republican-leaning (R+8), a spread of about 13 points.

Why South Lyon 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 South Lyon, not a ranked or complete list of what matters most.

South Lyon votes Republican even though it is densely developed (about 65%, far above the Michigan average of 31%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 75% of households in South Lyon are family households, above 76% of cities.

Preventive-care access and voter turnout

Places with strong routine preventive-care access tend to turn out at a higher rate; South Lyon, MI sits in the top tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.

Why turnout in South Lyon looks the way it does

Areas with strong routine healthcare access turn out at higher rates. South Lyon is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 77%, about 17 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 91% of households in South Lyon own their home, about 16 points above the U.S. average of 75%. High high-school completion lines up with higher turnout, and about 98% of adults in South Lyon have completed high school, above 94% 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 Michigan Department of State, 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.