Note: This is a listing of deprecated systems. These systems are either no longer in use or have been superceded by another system.
| System Name | Type | Flavor | City | County | Updated |
|---|---|---|---|---|---|
| Communications Center Inc | LTR | Standard | Gettysburg | Potter | 2023-01-10 |
| Ellsworth Air Force Base | Project 25 | Phase I | Rapid City | Pennington | 2018-01-10 |
| Milbank Communications | Motorola | Type I | Summit | Roberts | 2021-10-13 |
| Northern States Power Company (SD) | LTR | Standard | Various | Multi-County [3] | 2005-05-02 |
| RACOM Network | EDACS | Networked Standard | Various | Multi-County [41] | 2022-10-31 |
| Rees Communications (Mobridge) | Motorola | Type II | Fort Pierre | Walworth | 2024-01-11 |
| Siouxland Tri-State Area Radio Communications (STARCOMM) | Project 25 | Phase I | Sioux City | Multi-County [3] | 2017-07-24 |
| South Dakota State Radio System (OLD) | Motorola | Type II SmartZone | Statewide | Statewide | 2023-11-10 |
| Western Comm LTR (Rapid City) | LTR | Standard | Rapid City | Pennington | 2022-05-09 |
| Western Communications (Rapid City) | Motorola | Type IIi Hybrid | Rapid City | Pennington | 2022-05-06 |
| Western Communications (Sioux Falls) | Motorola | Type II | Sioux Falls | Minnehaha | 2022-05-07 |