Grimes County leans heavily Republican by roughly 42 points: about 29% of voters vote Democratic and 71% Republican.
About 67% of adults in Grimes County typically vote, near the U.S. average of about 62%. Among adults in Grimes County, ~19% vote Democratic, ~48% Republican, and ~33% don't vote. The map below shows estimated turnout by block group.
How Grimes County compares
Among counties within 50 miles, Grimes County leans more Republican than 6 of 9 neighbors.
Grimes County runs about 29 points more Republican than Texas as a whole.
Politics vary noticeably by city within Grimes County. The west side runs the most Democratic (D+7) and the north side runs the most Republican (R+70), a spread of about 78 points.
Why Grimes 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 Grimes County, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 73% of households in Grimes County are family households, about 6 points above the U.S. average of 67%.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; Grimes County, TX sits in the bottom quarter nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in Grimes County looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Grimes County is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Brazos County, TX D+6
- Washington County, TX R+37
- Waller County, TX R+20
- Walker County, TX R+20
- Montgomery County, TX R+35
- Madison County, TX R+43
- Burleson County, TX R+53
- Austin County, TX R+54
- Robertson County, TX R+35
- San Jacinto County, TX R+57
Counties with Similar Populations
- Orange County, VT Even
- Gallia County, OH R+57
- Marion County, AL R+79
- Marion County, SC D+17
- Decatur County, GA R+10
- Carroll County, VA R+63
- Morgan County, CO R+37
- Hancock County, WV R+42
- Neshoba County, MS R+31
- Franklin County, ME R+18
Sources and methodology
Precinct-level voting records used to fit the model come from Texas Secretary of State, Elections Division, 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.