Grantley leans Democratic by roughly 22 points: about 61% of voters vote Democratic and 39% Republican.
About 59% of adults in Grantley typically vote, near the U.S. average of about 62%. Among adults in Grantley, ~36% vote Democratic, ~23% Republican, and ~41% don't vote. The map below shows estimated turnout by block group.
How Grantley compares
Among neighborhoods within 5 miles, Grantley leans more Democratic than 2 of 6 neighbors.
Grantley runs about 25 points more Democratic than Pennsylvania as a whole. Pennsylvania is roughly evenly split, and Grantley sits clearly on the Democratic side.
Politics vary noticeably by block within Grantley. The north side is the most Democratic-leaning (D+50) and the east side is the least Democratic-leaning (D+11), a spread of about 38 points.
Why Grantley 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 Grantley, not a ranked or complete list of what matters most.
Areas with many never-married adults vote Democratic. About 58% of adults in Grantley have never been married, well above similar-sized neighborhoods (around 39%). Grantley runs against the grain of Pennsylvania, a Democratic-leaning outlier in a roughly evenly split state.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Grantley, York, PA sits in the top quarter nationally on this measure.
Why turnout in Grantley looks the way it does
Turnout in Grantley 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.
Nearby Neighborhoods
- Springdale, York, PA D+42
- Park Village, York, PA D+41
- The Avenues, York, PA D+30
- Northwest Triangle, York, PA D+40
- Valley View, York, PA Even
- Shiloh, York, PA R+12
- Stonybrook-Wilshire, York, PA R+15
- Springetts Manor-Yorklyn, York, PA D+6
- Hall Manor, Harrisburg, PA D+59
- Allison Hill, Harrisburg, PA D+63
Neighborhoods with Similar Populations
- Webster, Oakland, CA D+60
- Pioneer Square, Seattle, WA D+58
- Burke Acres, Kalamazoo, MI D+29
- Hobart Circle Historic District, Troy, OH R+23
- Brunswick, Gary, IN D+80
- Little Blue Valley, Kansas City, MO Even
- Stanley-Aley, Wichita, KS R+5
- Chabot Park, Oakland, CA D+67
- Baldwin District, Manassas, VA D+17
- Central Park, Superior, WI D+12
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.