Franklin County leans heavily Republican by roughly 48 points: about 26% of voters vote Democratic and 74% Republican.
About 77% of adults in Franklin County typically vote, above the U.S. average of about 62%. Among adults in Franklin County, ~20% vote Democratic, ~57% Republican, and ~23% don't vote. The map below shows estimated turnout by block group.
How Franklin County compares
Among counties within 50 miles, Franklin County leans more Republican than 5 of 12 neighbors.
Franklin County runs about 30 points more Republican than Missouri as a whole.
Politics vary noticeably by city within Franklin County. The west side is the most Republican-leaning (R+63) and the north side is the least Republican-leaning (R+39), a spread of about 23 points.
Why Franklin County leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Franklin County. The lean here lands roughly where demographic data alone would predict.
Frequent mental distress and voter turnout
Places with a low frequent-mental-distress rate tend to turn out at a higher rate; Franklin County, MO sits in the bottom tenth nationally on this measure. Reported mental distress does not drive turnout; it reflects economic and health conditions tied to voting.
Why turnout in Franklin County looks the way it does
Turnout in Franklin County sits close to the national pattern. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Warren County, MO R+50
- Gasconade County, MO R+58
- Jefferson County, MO R+39
- St. Charles County, MO R+14
- Crawford County, MO R+61
- Washington County, MO R+63
- St. Louis County, MO D+28
- Lincoln County, MO R+51
- St. Louis City, MO D+65
- Montgomery County, MO R+56
Counties with Similar Populations
- Flathead County, MT R+32
- Fond du Lac County, WI R+23
- Macon County, IL R+8
- Bay County, MI R+18
- Adams County, PA R+35
- Sumter County, SC D+9
- Cecil County, MD R+29
- Eau Claire County, WI D+10
- Tompkins County, NY D+49
- Wicomico County, MD D+6
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Sources and methodology
Precinct-level voting records used to fit the model come from Missouri 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.