UnitedOne Credit Union | 520 followers on LinkedIn. We're here because you're here! | UnitedOne is a member-owned financial cooperative that educates our members and helps them build financial strength. UnitedOne Credit Union was formed in 2002 by the merger between Manitowoc Community Credit Union and First Superior Credit Union. We are a full service financial institution that offers checking accounts, electronic services, consumer and mortgage loans, and small business services.