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- W M L ElectricBlack Hawk, SD
- Wagner Mobile Phone IncWagner, SD
- Watertown, City ofWatertown, SD
- Wayne Radio Works LlcSioux Falls, SD
- West Central Electric Cooperative, IncMurdo, SD
- West River Cooperative Telephone CompanyBison, SD
- West River Electric Asso IncWall, SD
- Western CommunicationsPierre, SD
- Western Communications IncRapid City, SD
- Whites EquipmentIroquois, SD
- Whites, RonIroquois, SD
- Whites, Ronald RIroquois, SD