Lewis County is a Republican stronghold. About 20% of voters here vote Democratic and 80% Republican.
About 67% of adults in Lewis County typically vote, near the U.S. average of about 62%. Among adults in Lewis County, ~13% vote Democratic, ~53% Republican, and ~34% don't vote. The map below shows estimated turnout by block group.
How Lewis County compares
Among counties within 50 miles, Lewis County leans more Republican than 3 of 5 neighbors.
Lewis County runs about 24 points more Republican than Idaho as a whole.
Politics vary noticeably by city within Lewis County. The north side is the most Republican-leaning (R+66) and the southeast side is the least Republican-leaning (R+55), a spread of about 12 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.
Rural areas vote Republican. About 6% of residents in Lewis County live in densely developed areas, about 12 points below the Idaho average of 18%.
Never-married share, developed land, and voter turnout
Places that combine a low never-married share and a rural land-use pattern tend to turn out at a higher rate, as Lewis County, ID does.
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
- Clearwater County, ID R+64
- Idaho County, ID R+64
- Nez Perce County, ID R+35
- Asotin County, WA R+29
- Latah County, ID R+4
- Whitman County, WA D+16
- Garfield County, WA R+58
- Benewah County, ID R+60
- Wallowa County, OR R+20
- Columbia County, WA R+51
Counties with Similar Populations
- Mercer County, MO R+70
- Sheridan County, MT R+58
- Hardeman County, TX R+60
- Baca County, CO R+69
- Osborne County, KS R+74
- Costilla County, CO D+19
- Smith County, KS R+72
- Catron County, NM R+36
- Baylor County, TX R+66
- Hanson County, SD R+72
Sources and methodology
Precinct-level voting records used to fit the model come from Idaho 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.