Old Gilroy is a true toss-up. About 48% of voters here vote Democratic and 52% Republican.
About 29% of adults in Old Gilroy typically vote, below the U.S. average of about 62%. Among adults in Old Gilroy, ~14% vote Democratic, ~15% Republican, and ~71% don't vote. The map below shows estimated turnout by block group.
How Old Gilroy compares
Among cities within 25 miles, Old Gilroy leans more Republican than 22 of 26 neighbors.
Old Gilroy runs about 25 points more Republican than California as a whole. California leans Democratic overall, while Old Gilroy is one of the few Republican-leaning pockets.
Why Old Gilroy leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Old Gilroy, not a ranked or complete list of what matters most.
Old Gilroy votes against the grain of California. California leans Democratic overall, while Old Gilroy runs about 25 points more Republican.
Cancer-screening access and voter turnout
Places with low colon-cancer-screening access tend to turn out at a lower rate; Old Gilroy, CA sits in the bottom quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Old Gilroy looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Old Gilroy 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 8% of homes in Old Gilroy have more than one occupant per room, above 95% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Gilroy, CA D+17
- Lonoke, CA Even
- Rucker, CA R+5
- San Martin, CA R+4
- San Juan Bautista, CA D+23
- Morse, CA D+16
- Aromas, CA D+12
- Idria, CA R+19
- Hollister, CA D+13
- Morgan Hill, CA D+13
Cities with Similar Populations
- Toms Creek, VA R+65
- West Caton, NY R+25
- Van Tassell, WY R+87
- Glendon, WV R+60
- Quanicassee, MI R+35
- West Sinton, TX R+42
- West Warm Springs, VA R+55
- New Scotland, NY D+10
- Avon, MS R+75
- Harris, KS R+68
All Local Stats
Home Services
Sources and methodology
Precinct-level voting records used to fit the model come from California 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.