Call
the Map
2026 midtermsResults

2026 results · South Dakota

Mike Rounds, the Republican, wins South Dakota’s Senate race by 21.0 points

Mike Rounds, the Republican, won the Senate seat by 21.0 points.

The governor's race moved 2.2 points toward Democrats from the 2024 presidential vote.

Who won each county, and how far it moved

Loading the counties

South Dakota’s one House seat

Loading the districts

Held by Republicans before the election. Marty Jackley, the Republican, won it, R+28.0.

Close up: the four counties that moved most

Loading the counties
Each county’s move from the 2024 presidential vote in the governor's race; the maps above show the result beside it.

In the governor's race, these moved furthest toward Republicans, among counties with 2,000 or more votes in 2024 and at least half a percent of the state’s.

  1. Hughes County

    Moved 7.5 points toward Republicans: R+30.1 for president in 2024; Larry Rhoden, the Republican, carried it at R+37.6.

    6,519 votes counted, 8,435 cast in 2024.

  2. Spink County

    Moved 4.7 points toward Republicans: R+39.0 for president in 2024; Larry Rhoden, the Republican, carried it at R+43.7.

    2,271 votes counted, 3,139 cast in 2024.

  3. Walworth County

    Moved 2.1 points toward Republicans: R+59.2 for president in 2024; Larry Rhoden, the Republican, carried it at R+61.3.

    1,648 votes counted, 2,466 cast in 2024.

  4. Tripp County

    Moved 1.8 points toward Republicans: R+63.3 for president in 2024; Larry Rhoden, the Republican, carried it at R+65.1.

    1,938 votes counted, 2,654 cast in 2024.

31 counties moved the other way, toward Democrats, the furthest Moody County, Sanborn County and Minnehaha County.

Who lives where it moved

Across counties, ten more points of adults with a degree went with a county about 1.7 points more Democratic, on average (r = 0.30, a weak relationship).

R+15R+10R+50D+5D+10D+150%10%20%30%40%50%% with a bachelor's degree →↑ moved toward Democrats from 2024

By place

Suburban2 counties, 92,776 votes6.7 pts → D
Rural64 counties, 211,719 votes0.2 pts → D

By race and ethnicity

White non-Hispanic 85% or more41 counties, 146,101 votes1.4 pts → D
Every other county25 counties, 158,394 votes3.1 pts → D

Each group’s counties added together: its 2026 margin against its 2024 presidential margin. Census Bureau American Community Survey, 2019–2023. Counties, not voters: there are no exit polls here.

Every race in South Dakota

Senate and governor

SenateMike Rounds Rover Brian L Bengs (I)+21.0——wonGovernorLarry Rhoden Rover Dan Ahlers (D)R+27.0R+29.22.2 pts → Dwon

House

At-largeMarty Jackley Rover Nicole "Nikki" Gronli (D)R+28.0R+29.11.1 pts → Dwon

Other statewide offices

Secretary of StateHeather Baxter Rover Terrence Davis (D)R+22.3R+29.26.9 pts → DwonTreasurerMelissa Hull Rover Margaret Kuipers (D)R+24.9R+29.24.3 pts → DwonAuditorCatherine Barranco Rover Tom Cool (D)R+25.1R+29.24.1 pts → Dwon

Ballot measures

Constitutional Amendment I: An amendment to the South Dakota constitution that repeals expanded medicaid coverage if federal funding for the program drops below 90%44.2% yesfailing
Constitutional Amendment J: An amendment to the South Dakota constitution clarifying that an individual must be a citizen of the United States to be eligible to vote61.5% yespassing
Constitutional Amendment K: An amendment to the South Dakota constitution establishing the trust for unclaimed property fund60.9% yespassing
Constitutional Amendment L: An amendment to the South Dakota constitution requiring that a proposed constitutional amendment or revision receive an affirmative vote of sixty percent of the votes cast42.4% yesfailing

Margins are the winner’s or leader’s lead in points of all votes cast. * Still counting: where we expect the count to finish. The move is the 2026 margin against the 2024 presidential margin on the same ground, for races between a Democrat and a Republican.

Ticket splitting

Compare

Across the 66 counties that lie wholly in one district, the governor's race went R+27.0 and the House races R+28.0: the governor's margin ran 1.0 points more Democratic than the House margin. Every county was carried by the same party in both.

Loading the map

Points of difference between the Governor margin and the House margin in each county.

Gov. D, House RGov. R, House DR+100R+50R+5000D+50D+50D+100D+100same margin in both ↗House marginGovernor margin
Each circle is a county, its area the votes cast. Above the line the Governor Democrat did better than the House Democrat; below it, worse.

46099Republican in both

Governor
R+5.2Ahlers against Rhoden
House
R+7.7the district's race
Difference
D+2.5Ahlers ran ahead
Votes
about 66,750
Most votes firstGov.HouseDiff.
  • 46099R+5.2R+7.7D+2.5
  • 46103R+25.5R+23.9R+1.6
  • 46083R+21.8R+23.4D+1.6
  • 46013R+27.7R+29.2D+1.5
  • 46011R+18.6R+19.6D+0.9
  • 46081R+32.2R+29.9R+2.2
  • 46093R+50.2R+50.20
  • 46029R+36.9R+39.6D+2.7
  • 46135R+23.0R+24.7D+1.7
  • 46065R+37.6R+37.1R+0.5
  • 46035R+36.3R+40.3D+4.0
  • 46127R+34.0R+34.6D+0.7
  • 46005R+40.8R+45.2D+4.4
  • 46033R+47.3R+46.6R+0.8
  • 46079R+31.4R+36.5D+5.1
  • 46027D+10.0D+10.4R+0.3
  • 46019R+59.8R+60.1D+0.3
  • 46047R+48.4R+49.8D+1.4
  • 46125R+48.8R+52.5D+3.7
  • 46109R+18.2R+22.4D+4.2
  • 46051R+45.4R+47.7D+2.3
  • 46023R+42.5R+40.5R+2.0
  • 46067R+59.6R+59.9D+0.3
  • 46101R+20.9R+30.4D+9.5
  • 46037R+29.1R+31.2D+2.0
  • 46115R+43.7R+44.7D+1.0
  • 46057R+57.0R+59.7D+2.7
  • 46102D+71.4D+72.3R+0.9
  • 46087R+43.8R+50.7D+7.0
  • 46009R+50.0R+50.7D+0.6
  • 46077R+44.9R+48.0D+3.1
  • 46123R+65.1R+66.9D+1.8
  • 46015R+42.8R+43.1D+0.3
  • 46039R+48.5R+52.3D+3.9
  • 46091R+27.5R+28.4D+0.9
  • 46121D+51.4D+49.4D+2.0
  • 46129R+61.3R+62.5D+1.3
  • 46053R+58.2R+58.5D+0.3
  • 46025R+60.6R+61.3D+0.7
  • 46045R+58.8R+57.3R+1.4
  • 46117R+53.2R+50.8R+2.4
  • 46041D+7.7D+12.9R+5.1
  • 46059R+65.9R+65.3R+0.6
  • 46105R+73.3R+69.9R+3.4
  • 46043R+77.8R+75.9R+1.8
  • 46061R+57.8R+56.7R+1.1
  • 46085R+39.0R+39.9D+0.9
  • 46089R+72.5R+74.5D+1.9
  • 46003R+52.9R+47.2R+5.6
  • 46107R+69.6R+67.5R+2.1
  • 46097R+46.8R+50.8D+4.1
  • 46007R+22.4R+24.2D+1.8
  • 46055R+79.7R+78.9R+0.8
  • 46111R+44.9R+45.2D+0.3
  • 46049R+68.7R+69.9D+1.2
  • 46071R+39.4R+36.6R+2.7
  • 46031R+12.7R+8.8R+3.9
  • 46119R+67.7R+70.4D+2.7
  • 46073R+53.1R+52.2R+0.9
  • 46063R+90.0R+86.3R+3.7
  • 46095R+31.7R+29.2R+2.5
  • 46021R+73.4R+71.9R+1.5
  • 46137R+11.6R+0.4R+11.3
  • 46069R+65.9R+62.9R+3.0
  • 46075R+78.4R+73.8R+4.6
  • 46017D+27.2D+12.2D+14.9

Margins are the Democrat minus the Republican in points of all votes cast in that race, from the counts the state’s election office has published so far; a county still counting is compared on what it has counted in both. The House is compared only in counties that lie wholly inside one congressional district, so the county's House margin is one race's margin; a county divided between districts, or in a district without a Democrat against a Republican, is left out. A difference is not a count of split tickets: a voter who skipped one race moves it too.

Counts are South Dakota’s official state and county counts, published by the South Dakota Secretary of State. Where a race is still being counted, its margin is where we expect the count to finish, marked *. A move from 2024 is the 2026 margin against Kamala Harris’s margin over Donald Trump in the same place. A race is won when we call it or the state certifies it.