Mars leans slightly Republican by roughly 14 points: about 43% of voters vote Democratic and 57% Republican.
About 97% of adults in Mars typically vote, above the U.S. average of about 62%. Among adults in Mars, ~42% vote Democratic, ~55% Republican, and ~3% don't vote. The map below shows estimated turnout by block group.
How Mars compares
Among cities within 25 miles, Mars leans more Republican than 100 of 203 neighbors.
Mars runs about 12 points more Republican than Pennsylvania as a whole.
Politics vary noticeably by neighborhood within Mars. The southwest side runs the most Democratic (Even) and the northeast side runs the most Republican (R+30), a spread of about 30 points.
Why Mars 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 Mars, not a ranked or complete list of what matters most.
Mars votes Republican even though it is densely developed (about 50%, well above the Pennsylvania average of 33%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; Mars, PA sits in the top tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Mars looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Mars 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 76%, about 15 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in Mars have completed high school, above 95% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Seven Fields, PA R+3
- Warrendale, PA Even
- Callery, PA R+30
- Cranberry Twp, PA R+12
- Bradford Woods, PA D+10
- Wexford, PA Even
- Watters, PA R+38
- Fernway, PA R+9
- Valencia, PA R+28
- Gibsonia, PA R+11
Cities with Similar Populations
- Makawao, HI D+22
- Worthington, OH D+35
- Middleburg Heights, OH R+3
- Alexander City, AL R+25
- Senoia, GA R+51
- Auburn, MA D+6
- Granite Falls, NC R+53
- Three Lakes, FL R+15
- Oxford, PA R+10
- Franklin Farm, VA D+36
All Local Stats
Home Services
Sources and methodology
Precinct-level voting records used to fit the model come from Pennsylvania Department of State, Bureau 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.