For over 50 years, the Diamond State Federal Credit Union, located in New Castle, has offered the people of the area complete financial services. You'll never feel like just an account number at this credit union. Members are always assisted courteously and efficiently. The staff and directors are committed to giving their members the best personal and financial service possible. Business and organizations in the New castle area are eligible to offer their employees credit union memberships. Click here to view our current Field of Membership and to learn more about the valuable benefits gained by becoming a member.