85121 is a Democratic stronghold. About 78% of voters here vote Democratic and 22% Republican.
About 29% of adults in 85121 typically vote, below the U.S. average of about 62%. Among adults in 85121, ~23% vote Democratic, ~6% Republican, and ~71% don't vote. The map below shows estimated turnout by block group.
How 85121 compares
Among zip codes within 15 miles, 85121 leans more Democratic than 14 of 15 neighbors.
85121 runs about 62 points more Democratic than Arizona as a whole. Arizona leans Republican overall, while 85121 is one of the few Democratic-leaning pockets.
Why 85121 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 85121, not a ranked or complete list of what matters most.
85121 votes against the grain of Arizona. Arizona leans Republican overall, while 85121 runs about 62 points more Democratic. A high never-married share predicts Democratic voting, and about 63% of adults in 85121 have never been married, above 98% of zip codes.
Cancer-screening access and voter turnout
Places with low colon-cancer-screening access tend to turn out at a lower rate; 85121, 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 85121 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 85121 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 35%, about 19 points below the Arizona average of 54%. Renters vote less often than owners, and about 47% of households in 85121 rent, compared to around 25% in nearby zip codes. High food insecurity lines up with lower turnout, and about 49% of adults in 85121 report food insecurity, in the top fraction 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.