Oasis leans slightly Republican by roughly 12 points: about 44% of voters vote Democratic and 56% Republican.
About 87% of adults in Oasis typically vote, above the U.S. average of about 62%. Among adults in Oasis, ~38% vote Democratic, ~49% Republican, and ~13% don't vote. The map below shows estimated turnout by block group.
How Oasis compares
Among cities within 25 miles, Oasis leans more Republican than 16 of 50 neighbors.
Politically, Oasis sits close to the rest of Iowa.
Politics vary noticeably by neighborhood within Oasis. The north side runs the most Democratic (D+6) and the east side runs the most Republican (R+39), a spread of about 45 points.
Why Oasis leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Oasis. The lean here lands roughly where demographic data alone would predict.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Oasis, IA sits in the top tenth 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 Oasis looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Oasis 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 73%, about 13 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in Oasis have completed high school, above 90% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- West Branch, IA R+26
- Morse, IA D+6
- Cedar Bluff, IA R+33
- Springdale, IA R+37
- Downey, IA R+28
- Iowa City, IA D+48
- University Heights, IA D+61
- Solon, IA Even
- Sutliff, IA R+9
- Coralville, IA D+44
Cities with Similar Populations
- Zeeland, ND R+68
- Alexandria, NE R+68
- East Krok, WI R+47
- New Augusta, AR R+53
- Terre Haute, IL R+50
- Easton, KY R+64
- Roy, LA R+76
- West Branch, NY R+50
- Crittenden, NY R+43
- Rummerfield, PA R+58
Sources and methodology
Precinct-level voting records used to fit the model come from Iowa 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.