18840 leans Republican by roughly 26 points: about 37% of voters vote Democratic and 63% Republican.
About 77% of adults in 18840 typically vote, above the U.S. average of about 62%. Among adults in 18840, ~29% vote Democratic, ~48% Republican, and ~23% don't vote. The map below shows estimated turnout by block group.
How 18840 compares
Among zip codes within 15 miles, 18840 is the least Republican-leaning.
18840 runs about 24 points more Republican than Pennsylvania as a whole.
Politics vary noticeably by block within 18840. The southwest side is the most Republican-leaning (R+40) and the south side is the least Republican-leaning (R+17), a spread of about 23 points.
Why 18840 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 18840, not a ranked or complete list of what matters most.
18840 votes Republican even though it is densely developed (about 74%, far 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; 18840, PA sits above the national average on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in 18840 looks the way it does
Turnout in 18840 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 Zip Codes
Zip Codes with Similar Populations
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.