Summit County leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.
About 78% of adults in Summit County typically vote, above the U.S. average of about 62%. Among adults in Summit County, ~43% vote Democratic, ~35% Republican, and ~22% don't vote. The map below shows estimated turnout by block group.
How Summit County compares
Among counties within 50 miles, Summit County is the most Democratic-leaning.
Summit County runs about 32 points more Democratic than Utah as a whole. Utah leans Republican overall, while Summit County is one of the few Democratic-leaning pockets.
Politics vary noticeably by city within Summit County. The southwest side runs the most Democratic (D+37) and the north side runs the most Republican (R+52), a spread of about 89 points.
Why Summit 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 Summit County, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 60% of adults in Summit County hold a bachelor's degree, about 31 points above the U.S. average of 28%. Summit County runs against the grain of Utah, a Democratic-leaning pocket in a Republican-leaning state.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Summit County, UT sits in the top tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in Summit County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Summit 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 75%, about 15 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 82% of households in Summit County own their home, above 86% of counties. High high-school completion lines up with higher turnout, and about 96% of adults in Summit County have completed high school, above 96% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Wasatch County, UT R+33
- Salt Lake County, UT D+10
- Morgan County, UT R+63
- Davis County, UT R+24
- Utah County, UT R+36
- Weber County, UT R+21
- Tooele County, UT R+45
- Uinta County, WY R+62
- Box Elder County, UT R+56
- Juab County, UT R+71
Counties with Similar Populations
- Ohio County, WV R+20
- Sweetwater County, WY R+53
- St. John the Baptist Parish, LA D+27
- Pierce County, WI R+19
- Mercer County, OH R+65
- Erath County, TX R+55
- Vance County, NC D+19
- Butler County, MO R+52
- Danville City, VA D+32
- Miller County, AR R+26
All Local Stats
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Sources and methodology
Precinct-level voting records used to fit the model come from Utah Lieutenant Governor's Office, 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.