Summerdale is a Democratic stronghold. About 79% of voters here vote Democratic and 21% Republican.
About 60% of adults in Summerdale typically vote, near the U.S. average of about 62%. Among adults in Summerdale, ~47% vote Democratic, ~13% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.
How Summerdale compares
Among neighborhoods within 5 miles, Summerdale leans more Democratic than 13 of 27 neighbors.
Summerdale runs about 60 points more Democratic than Pennsylvania as a whole. Pennsylvania is roughly evenly split, and Summerdale sits clearly on the Democratic side.
Politics vary noticeably by block within Summerdale. The east side is the most Democratic-leaning (D+64) and the west side is the least Democratic-leaning (D+52), a spread of about 12 points.
Why Summerdale leans the way it does
This analysis examined 14,881 data points per neighborhood to find what predicts political lean and turnout. The items below are a few correlations that stood out for Summerdale, not a ranked or complete list of what matters most.
Summerdale votes against the grain of Pennsylvania. Pennsylvania is roughly evenly split, while Summerdale runs about 60 points more Democratic. A high never-married share predicts Democratic voting, and about 51% of adults in Summerdale have never been married, above 83% of neighborhoods.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Summerdale, Philadelphia, PA sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in Summerdale looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Summerdale is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 49%, about 15 points below the Pennsylvania average of 64%. Low high-school completion lines up with lower turnout, and about 81% of adults in Summerdale have completed high school, below 83% of neighborhoods. Learn more about the findings and methodology on the political spectrum map.
Nearby Neighborhoods
- Lawncrest, Philadelphia, PA D+59
- Lawndale, Philadelphia, PA D+40
- Oxford Circle, Philadelphia, PA D+41
- Olney, Philadelphia, PA D+68
- Frankford, Philadelphia, PA D+56
- Juniata Park-Feltonville, Philadelphia, PA D+44
- Logan-Ogontz-Fern Rock, Philadelphia, PA D+85
- Wissanoning, Philadelphia, PA D+30
- Mayfield, Philadelphia, PA D+9
- Fox Chase-Burholme, Philadelphia, PA D+7
Neighborhoods with Similar Populations
- Burns Park, Ann Arbor, MI D+69
- Printers Row, Chicago, IL D+69
- North Redlands, Redlands, CA D+6
- East Tampa, Tampa, FL D+66
- Southwestern Outer Drive, Dearborn, MI D+3
- Loop, Chicago, IL D+57
- West Las Vegas, Las Vegas, NV D+52
- Santa Clara, Eugene, OR D+19
- Beach Haven, Jacksonville, FL R+16
- Kensington, Philadelphia, PA D+61
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.