Keesler Federal Credit Union is a federally chartered credit union headquartered in Biloxi, Mississippi, founded in 1947 to serve military personnel at Keesler Air Force Base. It is the largest credit union based in Mississippi with over $5 billion in assets and approximately 365,000–395,000 members, operating more than 50 branches across Mississippi, Louisiana, Alabama, and the United Kingdom.

Navigator FCU is a federal credit union serving members in Moss Point, Mississippi and surrounding areas. The institution operates as a community-based financial cooperative providing deposit and lending services to eligible members in its field of membership.

Southern Energy Credit Union, headquartered in Birmingham, Alabama, is the second-largest credit union in Alabama and the largest state-chartered credit union in the state. Founded in 1953 as APCO Employees Credit Union, it rebranded in 2025 following mergers with Powerco Federal Credit Union and Mutual Savings Credit Union. The institution serves over 90,000 members through 28 branches across Alabama, Georgia, and Mississippi, with over $3.5 billion in assets.