Grand Coulee leans heavily Republican by roughly 32 points: about 34% of voters vote Democratic and 66% Republican.
About 66% of adults in Grand Coulee typically vote, near the U.S. average of about 62%. Among adults in Grand Coulee, ~22% vote Democratic, ~44% Republican, and ~34% don't vote. The map below shows estimated turnout by block group.
How Grand Coulee compares
Among cities within 25 miles, Grand Coulee leans more Republican than 5 of 12 neighbors.
Grand Coulee runs about 50 points more Republican than Washington as a whole. Washington leans Democratic overall, while Grand Coulee is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Grand Coulee. The southwest side is the most Republican-leaning (R+44) and the northeast side is the least Republican-leaning (R+14), a spread of about 30 points.
Why Grand Coulee 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 Grand Coulee, not a ranked or complete list of what matters most.
Grand Coulee votes against the grain of Washington. Washington leans Democratic overall, while Grand Coulee runs about 50 points more Republican. Dense places usually vote Democratic, but Grand Coulee runs against that pattern.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Grand Coulee, WA sits above the national average on this measure.
Why turnout in Grand Coulee looks the way it does
Turnout in Grand Coulee 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
- Coulee Dam, WA D+6
- Electric City, WA R+45
- Mason City, WA R+57
- Elmer City, WA D+13
- Nespelem, WA D+52
- Almira, WA R+60
- Keller, WA D+13
- Mold, WA R+56
- Wilbur, WA R+55
- Hartline, WA R+53
Cities with Similar Populations
- Fisk, MO R+70
- South Portsmouth, KY R+62
- Cotton Valley, LA R+35
- Dighton, KS R+78
- Jamestown, SC R+14
- Clarkfield, MN R+47
- Hot Springs, VA R+51
- Montalba, TX R+77
- Omer, MI R+44
- Walker Springs, AL D+10
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.