Marietta leans Republican by roughly 22 points: about 39% of voters vote Democratic and 61% Republican.
About 81% of adults in Marietta typically vote, above the U.S. average of about 62%. Among adults in Marietta, ~32% vote Democratic, ~49% Republican, and ~19% don't vote. The map below shows estimated turnout by block group.
How Marietta compares
Among cities within 25 miles, Marietta leans more Republican than 46 of 156 neighbors.
Marietta runs about 20 points more Republican than Pennsylvania as a whole.
Politics vary noticeably by neighborhood within Marietta. The west side is the most Republican-leaning (R+33) and the southeast side is the least Republican-leaning (R+11), a spread of about 22 points.
Why Marietta leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Marietta, not a ranked or complete list of what matters most.
Marietta votes Republican even though it is densely developed (about 49%, well above the Pennsylvania average of 33%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Park access and Republican lean
Places with low park coverage tend to lean Republican; Marietta, PA sits in the bottom tenth nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in Marietta looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Marietta 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 69%, about 9 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Stacktown, PA R+41
- Rheems, PA R+29
- Maytown, PA R+37
- Mount Joy, PA R+19
- Donegal Springs, PA R+34
- Columbia, PA R+11
- Hallam, PA R+20
- Wrightsville, PA R+41
- Bainbridge, PA R+49
- Elizabethtown, PA R+19
Cities with Similar Populations
- Chuckey, TN R+69
- Santa Clara, UT R+56
- Jemison, AL R+76
- Mound, MN D+6
- Dorr, MI R+43
- Mendota, IL R+19
- Meadow Lakes, AK R+41
- Haiku-Pauwela, HI D+11
- Marshall, NC R+37
- Mascotte, FL R+18
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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.