U.S. House seat · lines in effect since 2022
South Dakota's at-large District
A district of about 907,000 people, 32% of adults with a bachelor's degree. It votes R+29.2 relative to the nation for president.
Source: 2026 results: South Dakota Secretary of State; boundaries: Census Bureau TIGER/LineUpdated Nov 7, 2026, 3:01 PM ET
Where it sits among all 435 seats
Every U.S. House seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.
Democratic
Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Every race on these lines
Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.
| 2016 | 2018 | 2020 | 2024 | 2026 | |
|---|---|---|---|---|---|
| U.S. Senate | R+43.6 | No race | R+30.8 | No race | No race |
| Governor | No race | R+20.3 | No race | No race | No race |
| U.S. House | No race | No race | No race | R+44.1 | R+28.0 |
Outlined: the race for this seat itselfBlank: no race that year
Source: 99chambers results archive: precinct results allocated to current lines; 2026: South Dakota Secretary of StateUpdated Nov 7, 2026, 3:01 PM ET
Who lives here, compared
Grey bars show the spread of all 435 seats. Small marks are other seats in South Dakota. The black marker is SD-AL.
Lower than 59% of seats.
Higher than 85% of seats.
Lower than 86% of seats.
Lower than 85% of seats.
Lower than 84% of seats.
Less dense than 99% of seats.
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET
Seats most like this one
Nearest seats on demographics, density and lean.
MT-231% college gradsR+29.9Held RND-AL
33% college gradsR+36.7Held RKS-1
30% college gradsR+30.9Held RID-2
34% college gradsR+26.6Held R
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Who has held it
These lines took effect in 2022.
- Marty Jackley (R)
2027– · Won 2026 by 28.0 - Dusty Johnson (R)
2023–2027 · Won 2022 by 54.8, 2024 by 44.1
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)