Westmoreland County leans Republican by roughly 26 points: about 37% of voters vote Democratic and 63% Republican.
About 82% of adults in Westmoreland County typically vote, above the U.S. average of about 62%. Among adults in Westmoreland County, ~30% vote Democratic, ~52% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How Westmoreland County compares
Among counties within 50 miles, Westmoreland County leans more Republican than 3 of 10 neighbors.
Westmoreland County runs about 25 points more Republican than Pennsylvania as a whole.
Politics vary noticeably by city within Westmoreland County. The northeast side is the most Republican-leaning (R+47) and the northwest side is the least Republican-leaning (R+16), a spread of about 31 points.
Why Westmoreland 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 Westmoreland County, not a ranked or complete list of what matters most.
Westmoreland County votes Republican even though it is densely developed (about 56%, well above the Pennsylvania average of 33%). Here an older population outweighs the Democratic lean that density usually predicts.
High-school completion and voter turnout
Places with high-school-completion-heavy adults tend to turn out at a higher rate; Westmoreland County, PA sits in the top tenth nationally on this measure.
Why turnout in Westmoreland County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Westmoreland County 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 66%, about 6 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in Westmoreland County have completed high school, above 94% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Allegheny County, PA D+22
- Fayette County, PA R+36
- Armstrong County, PA R+52
- Washington County, PA R+24
- Indiana County, PA R+34
- Somerset County, PA R+54
- Butler County, PA R+28
- Cambria County, PA R+35
- Greene County, PA R+43
- Beaver County, PA R+19
Counties with Similar Populations
- Nueces County, TX R+4
- Douglas County, CO R+7
- Horry County, SC R+30
- Galveston County, TX R+13
- Larimer County, CO D+16
- Hamilton County, IN R+5
- Davis County, UT R+24
- Marion County, OR D+3
- Anoka County, MN Even
- Somerset County, NJ D+15
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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.