Chartered as a construction local union in 1916, today IBEW 426 has 574. Local 426 serves eastern South Dakota and four countries in southwestern Minnesota, doing inside electrical construction, outside line construction, residential wiring, telecommunications, fiber optics, tree trimming, line clearance, utility, REAs and telephone co-ops.

Mail handlers union in Sioux Falls, SD.

Union representing teachers in the state. Affiliated with the National Education Association.

Independent organization for South Dakota's state employees. Membership information, current issues, and contact details.