Since 1949, Credit Union One has helped our members lead happier and more productive lives. Credit Union One is a full service financial institution. We are a Community Chartered Credit Union. This allows us to open our membership to anyone who resides in the State of Oklahoma. Credit Union One has experienced increases in both membership and assets. Credit Union One of Oklahoma was originally chartered in 1949 to serve the employees of statewide governement agencies. We serve the community, employees and members of more than 45 agencies and associations throughout the state.