Glenham is a Republican stronghold. About 11% of voters here vote Democratic and 89% Republican.
About 47% of adults in Glenham typically vote, below the U.S. average of about 62%. Among adults in Glenham, ~5% vote Democratic, ~42% Republican, and ~53% don't vote. The map below shows estimated turnout by block group.
How Glenham compares
Among cities within 25 miles, Glenham leans more Republican than 10 of 12 neighbors.
Glenham runs about 48 points more Republican than South Dakota as a whole.
Politics vary noticeably by neighborhood within Glenham. The west side is the most Republican-leaning (R+79) and the southwest side is the least Republican-leaning (R+63), a spread of about 16 points.
Why Glenham 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 Glenham, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 3% of residents in Glenham live in densely developed areas, about 6 points below the South Dakota average of 9%.
Developed land and Republican lean
Places with a rural land-use pattern tend to lean Republican; Glenham, SD sits in the bottom tenth nationally on this measure. Developed land does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Glenham looks the way it does
Turnout in Glenham 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
- Mobridge, SD R+41
- Sitka, SD R+73
- Selby, SD R+73
- Wakpala, SD D+58
- Akaska, SD R+79
- Promise, SD D+50
- Mound City, SD R+66
- North Riverside, SD R+74
- Java, SD R+78
- Trail City, SD R+16
Cities with Similar Populations
- Fitzhugh, VA D+20
- Midtown, TN R+59
- Sias, WV R+65
- Royal, NE R+77
- Rosine, KY R+70
- Rome, IA R+48
- Ulmer, SC R+33
- Keeter, TX R+75
- Rogers, LA R+95
- Ervintown, NC R+47
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Sources and methodology
Precinct-level voting records used to fit the model come from South Dakota 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.