Sumas leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.
About 67% of adults in Sumas typically vote, near the U.S. average of about 62%. Among adults in Sumas, ~21% vote Democratic, ~46% Republican, and ~33% don't vote. The map below shows estimated turnout by block group.
How Sumas compares
Among cities within 25 miles, Sumas is the most Republican-leaning.
Sumas runs about 57 points more Republican than Washington as a whole. Washington leans Democratic overall, while Sumas is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Sumas. The west side is the most Republican-leaning (R+50) and the southeast side is the least Republican-leaning (R+14), a spread of about 36 points.
Why Sumas 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 Sumas, not a ranked or complete list of what matters most.
Sumas votes against the grain of Washington. Washington leans Democratic overall, while Sumas runs about 57 points more Republican. A high family-household share predicts Republican voting, and about 78% of households in Sumas are family households, above 86% of cities.
Adult arthritis and voter turnout
Places with a low adult-arthritis rate tend to turn out at a higher rate; Sumas, WA sits in the bottom tenth nationally on this measure. Arthritis does not drive turnout; it reflects the age and health profile of an area.
Why turnout in Sumas looks the way it does
Turnout in Sumas sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Nooksack, WA R+32
- Everson, WA R+27
- Peaceful Valley, WA R+14
- Maple Falls, WA R+9
- Lynden, WA R+26
- Strandell, WA R+30
- Lawrence, WA R+26
- Welcome, WA R+4
- Deming, WA R+3
Cities with Similar Populations
- Suttons Bay, MI D+9
- Blackville, SC D+28
- Waldoboro, ME R+19
- Nixon, TX R+34
- Shiner, TX R+65
- Grantham, PA D+22
- Green Park, MO D+5
- Jamesville, NC R+31
- Lakeview, MI R+42
- Sandstone, MN R+31
All Local Stats
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Sources and methodology
Precinct-level voting records used to fit the model come from Washington 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.