Lehigh County leans slightly Democratic by roughly 6 points: about 53% of voters vote Democratic and 47% Republican.
About 74% of adults in Lehigh County typically vote, above the U.S. average of about 62%. Among adults in Lehigh County, ~39% vote Democratic, ~35% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How Lehigh County compares
Among counties within 50 miles, Lehigh County leans more Democratic than 9 of 15 neighbors.
Lehigh County runs about 8 points more Democratic than Pennsylvania as a whole.
Politics vary noticeably by city within Lehigh County. The east side runs the most Democratic (D+24) and the northwest side runs the most Republican (R+23), a spread of about 47 points.
Why Lehigh County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Lehigh County, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 79% of residents in Lehigh County live in densely developed areas, about 42 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Lehigh County sits in the top quarter (about 34%, above 84% of counties). A high never-married share predicts Democratic voting, and about 35% of adults in Lehigh County have never been married, above 83% of counties.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Lehigh County, PA sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Lehigh County looks the way it does
Turnout in Lehigh County 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 Counties
- Northampton County, PA Even
- Carbon County, PA R+35
- Berks County, PA R+8
- Warren County, NJ R+16
- Montgomery County, PA D+21
- Hunterdon County, NJ R+6
- Monroe County, PA Even
- Bucks County, PA Even
- Schuylkill County, PA R+36
- Chester County, PA D+14
Counties with Similar Populations
- Stark County, OH R+18
- Collier County, FL R+20
- Marion County, FL R+28
- Washtenaw County, MI D+44
- Brazoria County, TX R+17
- Bell County, TX R+3
- Forsyth County, NC D+18
- Hamilton County, TN R+10
- Lane County, OR D+21
- Lake County, FL R+25
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.