85018 leans slightly Democratic by roughly 12 points: about 56% of voters vote Democratic and 44% Republican.
About 73% of adults in 85018 typically vote, above the U.S. average of about 62%. Among adults in 85018, ~41% vote Democratic, ~32% Republican, and ~27% don't vote. The map below shows estimated turnout by block group.
How 85018 compares
Among zip codes within 15 miles, 85018 leans more Democratic than 33 of 66 neighbors.
85018 runs about 18 points more Democratic than Arizona as a whole. Arizona leans Republican overall, while 85018 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 85018. The southwest side runs the most Democratic (D+32) and the east side runs the most Republican (R+7), a spread of about 38 points.
Why 85018 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 85018, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 99% of residents in 85018 live in densely developed areas, about 62 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 85018 sits in the top quarter (about 60%, above 94% of zip codes). A high never-married share predicts Democratic voting, and about 35% of adults in 85018 have never been married, above 78% of zip codes.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 85018, AZ sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 85018 looks the way it does
Turnout in 85018 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 Arizona Secretary of State, 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.