85643 leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.
About 49% of adults in 85643 typically vote, below the U.S. average of about 62%. Among adults in 85643, ~15% vote Democratic, ~34% Republican, and ~51% don't vote. The map below shows estimated turnout by block group.
How 85643 compares
85643 runs about 33 points more Republican than Arizona as a whole.
Politics vary noticeably by block within 85643. The southwest side is the most Republican-leaning (R+56) and the east side is the least Republican-leaning (R+28), a spread of about 28 points.
Why 85643 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 85643. The lean here lands roughly where demographic data alone would predict.
Cancer-screening access and voter turnout
Places with low colon-cancer-screening access tend to turn out at a lower rate; 85643, AZ sits in the bottom tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in 85643 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 85643 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Crowded housing lines up with lower turnout, and about 6% of homes in 85643 have more than one occupant per room, above 90% of zip codes. Low high-school completion lines up with lower turnout, and about 78% of adults in 85643 have completed high school, below 93% 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 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.