84105 is a Democratic stronghold. About 85% of voters here vote Democratic and 15% Republican.
About 69% of adults in 84105 typically vote, above the U.S. average of about 62%. Among adults in 84105, ~59% vote Democratic, ~10% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.
How 84105 compares
Among zip codes within 15 miles, 84105 is the most Democratic-leaning.
84105 runs about 92 points more Democratic than Utah as a whole. Utah leans Republican overall, while 84105 is one of the few Democratic-leaning pockets.
Why 84105 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 84105, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 84105 live in densely developed areas, about 64 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 84105 sits in the top quarter (about 66%, above 96% of zip codes). 84105 runs against the grain of Utah, a Democratic-leaning pocket in a Republican-leaning state.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 84105, UT 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 84105 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 84105 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%. High high-school completion lines up with higher turnout, and about 97% of adults in 84105 have completed high school, above 88% of zip codes. 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 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.