Obrien leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.
About 43% of adults in Obrien typically vote, below the U.S. average of about 62%. Among adults in Obrien, ~13% vote Democratic, ~30% Republican, and ~57% don't vote. The map below shows estimated turnout by block group.
How Obrien compares
Among cities within 25 miles, Obrien leans more Republican than 8 of 21 neighbors.
Obrien runs about 58 points more Republican than California as a whole. California leans Democratic overall, while Obrien is one of the few Republican-leaning pockets.
Why Obrien 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 Obrien, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 3% of residents in Obrien live in densely developed areas, about 55 points below the California average of 58%. Obrien runs against the grain of California, a Republican-leaning pocket in a Democratic-leaning state.
Population density and Republican lean
Places with low population density tend to lean Republican; Obrien, CA sits in the bottom tenth nationally on this measure.
Why turnout in Obrien looks the way it does
Crowded housing lines up with lower turnout. About 7% of homes in Obrien have more than one occupant per room, above 92% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Whiskeytown, CA R+39
- Bella Vista, CA R+46
- Ingot, CA R+39
- Shasta Lake, CA R+35
- Oak Run, CA R+39
- Palo Cedro, CA R+42
- Summit City, CA R+40
- Millville, CA R+44
- Redding, CA R+25
- Keswick, CA R+41
Cities with Similar Populations
- St. Helena, NE R+71
- Mossville, AR R+55
- Moxahala, OH R+57
- Pancoastburg, OH R+66
- Pleasant Hill, NE R+59
- Phillipsville, CA D+19
- Priddy, TX R+78
- Ancona, IL R+53
- Church View, VA R+20
- Hermitage Springs, TN R+75
All Local Stats
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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.