Oliver County is a Republican stronghold. About 17% of voters here vote Democratic and 83% Republican.
About 76% of adults in Oliver County typically vote, above the U.S. average of about 62%. Among adults in Oliver County, ~13% vote Democratic, ~63% Republican, and ~24% don't vote. The map below shows estimated turnout by block group.
How Oliver County compares
Among counties within 50 miles, Oliver County is the most Republican-leaning.
Oliver County runs about 30 points more Republican than North Dakota as a whole.
Why Oliver 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 Oliver County, not a ranked or complete list of what matters most.
Rural areas with a high white share vote Republican. Oliver County sits in the bottom quarter on density and about 99% of residents are non-Hispanic white, about 12 points above the North Dakota average of 87%. A high family-household share predicts Republican voting, and about 77% of households in Oliver County are family households, above 97% of counties.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; Oliver County, ND sits in the bottom tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in Oliver County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Oliver County is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 66%, about 6 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 95% of households in Oliver County own their home, compared to around 75% in nearby counties. High high-school completion lines up with higher turnout, and about 95% of adults in Oliver County have completed high school, above 90% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Mercer County, ND R+65
- Morton County, ND R+49
- McLean County, ND R+51
- Burleigh County, ND R+32
- Grant County, ND R+71
- Sheridan County, ND R+69
- Dunn County, ND R+53
- Sioux County, ND D+54
- Stark County, ND R+53
- Kidder County, ND R+61
Counties with Similar Populations
- Logan County, ND R+75
- Garden County, NE R+70
- Haakon County, SD R+71
- Sherman County, OR R+59
- Gosper County, NE R+72
- Eureka County, NV R+72
- Armstrong County, TX R+77
- Deuel County, NE R+71
- Mellette County, SD R+25
- Meagher County, MT R+58
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Sources and methodology
Precinct-level voting records used to fit the model come from North 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.