| State Senator | John Sjaarda | REP | 02/02/2026 | District 02 | | | 115 Lynx St Valley Springs SD 57068 | 300 | John | | Sjaarda | | Active | Primary | 6/2/2026 12:00:00 AM | 115 Lynx St | | Valley Springs | SD | 57068 | SEN | |
| State Senator | Manuel Luschas (Withdrawn 02/11/2026) | REP | 01/23/2026 | District 02 | | 02/11/2026 | 1813 S Parkview Blvd Brandon SD 57005 | 300 | Manuel | | Luschas | | Withdrawn | Primary | 6/2/2026 12:00:00 AM | 1813 S Parkview Blvd | | Brandon | SD | 57005 | SEN | |
| State Senator | Carl Perry | REP | 01/12/2026 | District 03 | | | 2722 Railroad Cir Aberdeen SD 57401 | 300 | Carl | | Perry | | Active | Primary | 6/2/2026 12:00:00 AM | 2722 Railroad Cir | | Aberdeen | SD | 57401 | SEN | |
| State Senator | Glen A. Vilhauer | REP | 02/17/2026 | District 05 | | | PO Box 1091 Watertown SD 57201 | 300 | Glen | A. | Vilhauer | | Active | Primary | 6/2/2026 12:00:00 AM | PO Box 1091 | | Watertown | SD | 57201 | SEN | |
| State Senator | Ernie Otten | REP | 01/06/2026 | District 06 | | | 46787 273rd St Tea SD 57064 | 300 | Ernie | | Otten | | Active | Primary | 6/2/2026 12:00:00 AM | 46787 273rd St | | Tea | SD | 57064 | SEN | |
| State Senator | Aaron Matson | DEM | 02/18/2026 | District 11 | | | 4701 S Key Ave Sioux Falls SD 57106 | 300 | Aaron | | Matson | | Active | Primary | 6/2/2026 12:00:00 AM | 4701 S Key Ave | | Sioux Falls | SD | 57106 | SEN | |
| State Senator | Sue Peterson | REP | 01/23/2026 | District 13 | | | 6405 S Killarney Cir Sioux Falls SD 57108 | 300 | Sue | | Peterson | | Active | Primary | 6/2/2026 12:00:00 AM | 6405 S Killarney Cir | | Sioux Falls | SD | 57108 | SEN | |
| State Senator | Erik Muckey | DEM | 02/03/2026 | District 15 | | | 196 E 6th St Apt 308 Sioux Falls SD 57104 | 300 | Erik | | Muckey | | Active | Primary | 6/2/2026 12:00:00 AM | 196 E 6th St Apt 308 | | Sioux Falls | SD | 57104 | SEN | |
| State Senator | Kevin D. Jensen | REP | 02/09/2026 | District 16 | | | 27808 484th Ave Canton SD 57013 | 300 | Kevin | D. | Jensen | | Active | Primary | 6/2/2026 12:00:00 AM | 27808 484th Ave | | Canton | SD | 57013 | SEN | |
| State Senator | Sydney Davis | REP | 01/13/2026 | District 17 | | | 46838 307th St Burbank SD 57010 | 300 | Sydney | | Davis | | Active | Primary | 6/2/2026 12:00:00 AM | 46838 307th St | | Burbank | SD | 57010 | SEN | |
| State Senator | Jean Hunhoff | REP | 02/09/2026 | District 18 | | | 2511 Mulligan Dr Yankton SD 57078 | 300 | Jean | | Hunhoff | | Active | Primary | 6/2/2026 12:00:00 AM | 2511 Mulligan Dr | | Yankton | SD | 57078 | SEN | |
| State Senator | Paul Miskimins | REP | 01/13/2026 | District 20 | | | 1225 Summit Drive Mitchell SD 57301 | 300 | Paul | | Miskimins | | Active | Primary | 6/2/2026 12:00:00 AM | 1225 Summit Drive | | Mitchell | SD | 57301 | SEN | |
| State Senator | Brandon R. Wipf | REP | 02/11/2026 | District 22 | | | 40396 S Shore Rd Huron SD 57350 | 300 | Brandon | R. | Wipf | | Active | Primary | 6/2/2026 12:00:00 AM | 40396 S Shore Rd | | Huron | SD | 57350 | SEN | |
| State Senator | Brian Joseph Murphy | REP | 02/06/2026 | District 24 | | | 129 Hyde Drive Pierre SD 57501 | 300 | Brian | Joseph | Murphy | | Active | Primary | 6/2/2026 12:00:00 AM | 129 Hyde Drive | | Pierre | SD | 57501 | SEN | |
| State Senator | Shawn Bordeaux | DEM | 02/09/2026 | District 26 | | | PO Box 283 Mission SD 57555 | 300 | Shawn | | Bordeaux | | Active | Primary | 6/2/2026 12:00:00 AM | PO Box 283 | | Mission | SD | 57555 | SEN | |
| State Senator | Troy "Luke" Lunderman | DEM | 02/11/2026 | District 26 | | | PO Box 113 Saint Francis SD 57572 | 300 | Troy | "Luke" | Lunderman | | Active | Primary | 6/2/2026 12:00:00 AM | PO Box 113 | | Saint Francis | SD | 57572 | SEN | |
| State Senator | Rebecca Reimer | REP | 02/02/2026 | District 26 | | | 138 S Main St Chamberlain SD 57325 | 300 | Rebecca | | Reimer | | Active | Primary | 6/2/2026 12:00:00 AM | 138 S Main St | | Chamberlain | SD | 57325 | SEN | |
| State Senator | Anthony Kathol | REP | 01/13/2026 | District 27 | | | PO Box 165 Martin SD 57551 | 300 | Anthony | | Kathol | | Active | Primary | 6/2/2026 12:00:00 AM | PO Box 165 | | Martin | SD | 57551 | SEN | |
| State Senator | Sam Marty | REP | 02/03/2026 | District 28 | | | 16692 Antelope Rd Prairie City SD 57649 | 300 | Sam | | Marty | | Active | Primary | 6/2/2026 12:00:00 AM | 16692 Antelope Rd | | Prairie City | SD | 57649 | SEN | |
| State Senator | John Carley | REP | 01/09/2026 | District 29 | | | PO Box 17 Piedmont SD 57769 | 300 | John | | Carley | | Active | Primary | 6/2/2026 12:00:00 AM | PO Box 17 | | Piedmont | SD | 57769 | SEN | |
| State Senator | William J. Meirose | REP | 01/16/2026 | District 29 | | | 170 Old Stone Rd Sturgis SD 57785 | 300 | William | J. | Meirose | | Active | Primary | 6/2/2026 12:00:00 AM | 170 Old Stone Rd | | Sturgis | SD | 57785 | SEN | |
| State Senator | Randy Deibert | REP | 01/13/2026 | District 31 | | | 1715 Scott Ave Spearfish SD 57783 | 300 | Randy | | Deibert | | Active | Primary | 6/2/2026 12:00:00 AM | 1715 Scott Ave | | Spearfish | SD | 57783 | SEN | |
| State Senator | Helene Duhamel | REP | 01/14/2026 | District 32 | | | 1622 West Blvd Rapid City SD 57701 | 300 | Helene | | Duhamel | | Active | Primary | 6/2/2026 12:00:00 AM | 1622 West Blvd | | Rapid City | SD | 57701 | SEN | |
| State Senator | Karen M. McNeal | REP | 01/12/2026 | District 32 | | | 1201 Kulpaca Pl Rapid City SD 57701 | 300 | Karen | M. | McNeal | | Active | Primary | 6/2/2026 12:00:00 AM | 1201 Kulpaca Pl | | Rapid City | SD | 57701 | SEN | |
| State Senator | Curt Voight | REP | 02/19/2026 | District 33 | | | 8730 Kings Road Rapid City SD 57702 | 300 | Curt | | Voight | | Active | Primary | 6/2/2026 12:00:00 AM | 8730 Kings Road | | Rapid City | SD | 57702 | SEN | |
| State Senator | David Johnson | REP | 01/27/2026 | District 33 | | | PO Box 3403 Rapid City SD 57709 | 300 | David | | Johnson | | Active | Primary | 6/2/2026 12:00:00 AM | PO Box 3403 | | Rapid City | SD | 57709 | SEN | |
| State Senator | Jason E. Green | REP | 02/18/2026 | District 34 | | | 5251 Carriage Hills Drive Rapid City SD 57702 | 300 | Jason | E. | Green | | Active | Primary | 6/2/2026 12:00:00 AM | 5251 Carriage Hills Drive | | Rapid City | SD | 57702 | SEN | |
| State Senator | Greg Blanc | REP | 01/26/2026 | District 35 | | | 618 Aaron Ct Rapid City SD 57703 | 300 | Greg | | Blanc | | Active | Primary | 6/2/2026 12:00:00 AM | 618 Aaron Ct | | Rapid City | SD | 57703 | SEN | |
| State Representative | Keith Miller | REP | 02/18/2026 | District 01 | | | 38514 139th St Aberdeen SD 57401 | 310 | Keith | | Miller | | Active | Primary | 6/2/2026 12:00:00 AM | 38514 139th St | | Aberdeen | SD | 57401 | HOU | |
| State Representative | Logan Manhart | REP | 01/12/2026 | District 01 | | | 2640 130th St NW Lot 81 Aberdeen SD 57401 | 310 | Logan | | Manhart | | Active | Primary | 6/2/2026 12:00:00 AM | 2640 130th St NW Lot 81 | | Aberdeen | SD | 57401 | HOU | |
| State Representative | Adam Long | REP | 01/12/2026 | District 02 | | | 8212 E Willow Wood St Sioux Falls SD 57110 | 310 | Adam | | Long | | Active | Primary | 6/2/2026 12:00:00 AM | 8212 E Willow Wood St | | Sioux Falls | SD | 57110 | HOU | |
| State Representative | John Sjaarda (Withdrawn 02/02/2026) | REP | 01/12/2026 | District 02 | | 02/02/2026 | 115 Lynx St Valley Springs SD 57068 | 310 | John | | Sjaarda | | Withdrawn | Primary | 6/2/2026 12:00:00 AM | 115 Lynx St | | Valley Springs | SD | 57068 | HOU | |
| State Representative | Manuel Luschas | REP | 02/11/2026 | District 02 | | | 1813 S Parkview Blvd Brandon SD 57005 | 310 | Manuel | | Luschas | | Active | Primary | 6/2/2026 12:00:00 AM | 1813 S Parkview Blvd | | Brandon | SD | 57005 | HOU | |
| State Representative | Al Novstrup | REP | 01/21/2026 | District 03 | | | 1705 Northview Ln Aberdeen SD 57401 | 310 | Al | | Novstrup | | Active | Primary | 6/2/2026 12:00:00 AM | 1705 Northview Ln | | Aberdeen | SD | 57401 | HOU | |
| State Representative | Kent Roe | REP | 02/18/2026 | District 04 | | | 45022 SD Highway 22 Hayti SD 57241 | 310 | Kent | | Roe | | Active | Primary | 6/2/2026 12:00:00 AM | 45022 SD Highway 22 | | Hayti | SD | 57241 | HOU | |
| State Representative | Matt Roby | REP | 02/09/2026 | District 05 | | | PO Box 213 Watertown SD 57201 | 310 | Matt | | Roby | | Active | Primary | 6/2/2026 12:00:00 AM | PO Box 213 | | Watertown | SD | 57201 | HOU | |
| State Representative | Austin Wolf | DEM | 02/13/2026 | District 06 | | | 5609 S Mandy Ave Sioux Falls SD 57106 | 310 | Austin | | Wolf | | Active | Primary | 6/2/2026 12:00:00 AM | 5609 S Mandy Ave | | Sioux Falls | SD | 57106 | HOU | |
| State Representative | Jerry Jongeling | REP | 02/17/2026 | District 06 | | | 27207 472nd Ave Sioux Falls SD 57108 | 310 | Jerry | | Jongeling | | Active | Primary | 6/2/2026 12:00:00 AM | 27207 472nd Ave | | Sioux Falls | SD | 57108 | HOU | |
| State Representative | Amanda Potter | DEM | 02/18/2026 | District 09 | | | 2501 S Louise Ave Box 87986 Sioux Falls SD 57109 | 310 | Amanda | | Potter | | Active | Primary | 6/2/2026 12:00:00 AM | 2501 S Louise Ave Box 87986 | | Sioux Falls | SD | 57109 | HOU | |
| State Representative | Bethany Soye | REP | 02/20/2026 | District 09 | | | PO Box 84124 Sioux Falls SD 57118 | 310 | Bethany | | Soye | | Active | Primary | 6/2/2026 12:00:00 AM | PO Box 84124 | | Sioux Falls | SD | 57118 | HOU | |
| State Representative | Tesa Schwans | REP | 02/09/2026 | District 09 | | | 26526 Lakeview Pl Hartford SD 57033 | 310 | Tesa | | Schwans | | Active | Primary | 6/2/2026 12:00:00 AM | 26526 Lakeview Pl | | Hartford | SD | 57033 | HOU | |
| State Representative | Kathleen Brudvig | DEM | 02/09/2026 | District 10 | | | 705 E 21st St Sioux Falls SD 57105 | 310 | Kathleen | | Brudvig | | Active | Primary | 6/2/2026 12:00:00 AM | 705 E 21st St | | Sioux Falls | SD | 57105 | HOU | |
| State Representative | Bobbi L. Andera | REP | 01/13/2026 | District 10 | | | 207 E 23rd St Sioux Falls SD 57105 | 310 | Bobbi | L. | Andera | | Active | Primary | 6/2/2026 12:00:00 AM | 207 E 23rd St | | Sioux Falls | SD | 57105 | HOU | |
| State Representative | Sonja Mentzer | DEM | 02/18/2026 | District 11 | | | 6100 W Oscar Howe Circle Sioux Falls SD 57106 | 310 | Sonja | | Mentzer | | Active | Primary | 6/2/2026 12:00:00 AM | 6100 W Oscar Howe Circle | | Sioux Falls | SD | 57106 | HOU | |
| State Representative | John C. Kunnari | REP | 02/17/2026 | District 11 | | | 5808 W 52nd St Sioux Falls SD 57106 | 310 | John | C. | Kunnari | | Active | Primary | 6/2/2026 12:00:00 AM | 5808 W 52nd St | | Sioux Falls | SD | 57106 | HOU | |
| State Representative | Keri K. Weems | REP | 02/17/2026 | District 11 | | | 7308 W Lancaster St Sioux Falls SD 57106 | 310 | Keri | K. | Weems | | Active | Primary | 6/2/2026 12:00:00 AM | 7308 W Lancaster St | | Sioux Falls | SD | 57106 | HOU | |
| State Representative | Kerry Loudenslager | REP | 01/09/2026 | District 12 | | | 3113 W 77th St Sioux Falls SD 57108 | 310 | Kerry | | Loudenslager | | Active | Primary | 6/2/2026 12:00:00 AM | 3113 W 77th St | | Sioux Falls | SD | 57108 | HOU | |
| State Representative | Jack R Kolbeck | REP | 01/13/2026 | District 13 | | | 1124 E Plum Creek Rd Sioux Falls SD 57105 | 310 | Jack | R | Kolbeck | | Active | Primary | 6/2/2026 12:00:00 AM | 1124 E Plum Creek Rd | | Sioux Falls | SD | 57105 | HOU | |
| State Representative | John Hughes | REP | 01/20/2026 | District 13 | | | 4405 South River Oaks Circle Sioux Falls SD 57105 | 310 | John | | Hughes | | Active | Primary | 6/2/2026 12:00:00 AM | 4405 South River Oaks Circle | | Sioux Falls | SD | 57105 | HOU | |
| State Representative | Kadyn Wittman | DEM | 02/03/2026 | District 15 | | | 317 S Phillips Ave Apt 201 Sioux Falls SD 57104 | 310 | Kadyn | | Wittman | | Active | Primary | 6/2/2026 12:00:00 AM | 317 S Phillips Ave Apt 201 | | Sioux Falls | SD | 57104 | HOU | |