In 1957 Lemmon Federal Credit Union in South Dakota was chartered to serve the local community. The first expansion of the charter was a branch in Faith, SD in 1984. In 1992 the credit union in Hettinger, ND was merged into Lemmon Federal and the name was changed to Dakota Plains Federal Credit Union. In 1998 a fourth office was opened in Bison, SD and a fifth office was opened in Pierre, SD in 2003. Once you become a member, you are always a member, even if you move outside the area. No matter where your family members reside, they are also eligible for membership.