Plum leans slightly Republican by roughly 10 points: about 45% of voters vote Democratic and 55% Republican.
About 93% of adults in Plum typically vote, above the U.S. average of about 62%. Among adults in Plum, ~42% vote Democratic, ~51% Republican, and ~7% don't vote. The map below shows estimated turnout by block group.
How Plum compares
Among cities within 25 miles, Plum leans more Republican than 94 of 248 neighbors.
Plum runs about 7 points more Republican than Pennsylvania as a whole.
Politics vary noticeably by neighborhood within Plum. The northeast side is the most Republican-leaning (R+24) and the southeast side is the least Republican-leaning (R+3), a spread of about 21 points.
Why Plum 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 Plum, not a ranked or complete list of what matters most.
Plum votes Republican even though it is densely developed (about 63%, well above the Pennsylvania average of 33%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
High-school completion and voter turnout
Places with high-school-completion-heavy adults tend to turn out at a higher rate; Plum, PA sits in the top tenth nationally on this measure.
Why turnout in Plum looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Plum 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 72%, about 12 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in Plum have completed high school, above 94% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Monroeville, PA D+20
- Springdale, PA R+7
- Murrysville, PA R+15
- Verona, PA D+26
- Oakmont, PA D+21
- Harwick, PA R+18
- New Kensington, PA R+8
- Alcoa Center, PA R+44
- Pitcairn, PA D+17
- Blawnox, PA D+20
Cities with Similar Populations
- Flowing Wells, AZ D+11
- Homewood, AL D+14
- Lake St. Louis, MO R+16
- Olney, MD D+40
- El Macero, CA D+53
- Claremore, OK R+40
- Stoughton, MA D+23
- Westmont, IL D+16
- Mount Pleasant, WI D+8
- Chatsworth, GA R+66
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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.