Lewis County leans Republican by roughly 28 points: about 36% of voters vote Democratic and 64% Republican.
About 74% of adults in Lewis County typically vote, above the U.S. average of about 62%. Among adults in Lewis County, ~27% vote Democratic, ~47% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How Lewis County compares
Among counties within 50 miles, Lewis County is the most Republican-leaning.
Lewis County runs about 47 points more Republican than Washington as a whole. Washington leans Democratic overall, while Lewis County is one of the few Republican-leaning pockets.
Politics vary noticeably by city within Lewis County. The south side is the most Republican-leaning (R+40) and the northwest side is the least Republican-leaning (R+14), a spread of about 26 points.
Why Lewis County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Lewis County, not a ranked or complete list of what matters most.
Lewis County votes against the grain of Washington. Washington leans Democratic overall, while Lewis County runs about 47 points more Republican.
Local retail density and voter turnout
Places with dense local retail within a mile tend to turn out at a higher rate; Lewis County, WA sits in the top tenth nationally on this measure. Nearby retail does not change how people vote; it reflects how urban and built-up a place is.
Why turnout in Lewis County looks the way it does
Turnout in Lewis County 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 Counties
- Thurston County, WA D+19
- Cowlitz County, WA R+18
- Wahkiakum County, WA R+19
- Pierce County, WA D+12
- Mason County, WA R+5
- Columbia County, OR R+18
- Grays Harbor County, WA R+8
- Pacific County, WA R+5
- Clatsop County, OR D+6
- Clark County, WA D+7
Counties with Similar Populations
- Talladega County, AL R+27
- Henderson County, TX R+60
- Bartholomew County, IN R+30
- Bullitt County, KY R+48
- Leavenworth County, KS R+20
- St. Landry Parish, LA R+11
- Cape Girardeau County, MO R+34
- Payne County, OK R+18
- Yuba County, CA R+16
- Monroe County, FL R+15
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.