Henley leans heavily Republican by roughly 44 points: about 28% of voters vote Democratic and 72% Republican.
About 58% of adults in Henley typically vote, near the U.S. average of about 62%. Among adults in Henley, ~16% vote Democratic, ~42% Republican, and ~42% don't vote. The map below shows estimated turnout by block group.
How Henley compares
Among cities within 25 miles, Henley leans more Republican than 8 of 10 neighbors.
Henley runs about 65 points more Republican than California as a whole. California leans Democratic overall, while Henley is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Henley. The southeast side is the most Republican-leaning (R+50) and the east side is the least Republican-leaning (R+29), a spread of about 21 points.
Why Henley 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 Henley, not a ranked or complete list of what matters most.
Henley votes against the grain of California. California leans Democratic overall, while Henley runs about 65 points more Republican. Rural areas vote Republican, and Henley sits in the bottom quarter on density (about 4%, below 88% of cities). Low college attainment predicts Republican voting, and Henley sits in the bottom quarter (about 15%, below 77% of cities).
Developed land and Republican lean
Places with a rural land-use pattern tend to lean Republican; Henley, CA sits in the bottom quarter nationally on this measure. Developed land does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Henley looks the way it does
Crowded housing lines up with lower turnout. About 6% of homes in Henley 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
- Hornbrook, CA R+40
- Little Shasta, CA R+48
- Yreka, CA R+23
- Montague, CA R+46
- Grenada, CA R+44
- Klamath River, CA R+31
- Lincoln, OR D+2
- Mountain View, OR R+4
- Ashland, OR D+50
- Fort Jones, CA R+31
Cities with Similar Populations
- McCombs, KY R+75
- West Rainier, OR R+24
- Salem Corners, MN R+34
- Farnsworth, TX R+89
- South Platte, CO R+12
- Jefferson Junction, WI R+31
- Niagara, KY R+52
- Channing, TX R+87
- Trapp, KY R+61
- Palmyra, IA R+39
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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.