The History of American United Family of Credit Unions American United Federal Credit Union has been serving members since December 1952. The credit union is a wholly member-owned, non-profit cooperative financial institution, dedicated to serving the financial needs of its members. We Help When Others Won't. Membership in American United is open to anyone who lives, works, worships, or attends school, in Salt Lake and Tooele Counties, Utah and credit union members can also invite their relatives to join. As of the September 2017, American United serves over 20,000 members, with ten branches in Utah and California. The credit union oversees all operations from its administrative office in West Jordan, Utah.