Marine Credit Union is a member-owned financial cooperative headquartered in La Crosse, Wisconsin, serving more than 70,000 members across Wisconsin, Iowa, and Minnesota. Founded in 1949 for Mercury Marine employees, it has since merged with or acquired over thirty financial institutions. The credit union is federally insured by the NCUA and operates as a not-for-profit organization returning profits to members through better rates and lower fees.

Marion and Polk Schools Credit Union, doing business as Maps Credit Union, is a federal credit union based in Salem, Oregon, founded in 1935 by 20 school teachers. Originally serving Marion County Public Schools and Willamette University employees, it expanded its charter in 2008 to include all Willamette Valley residents. The credit union operates 16 branches throughout the Mid-Willamette Valley region and serves over 81,000 members.

Matanuska Valley Federal Credit Union (MVFCU) is a not-for-profit financial cooperative founded in 1948 in Palmer, Alaska, serving over 59,300 members. It offers community-based banking services for people who live or work in Alaska and Hawaii. As the third-largest credit union in Alaska, MVFCU is member-owned and provides a full range of financial services including loans, mortgages, credit cards, and savings products.

MAX Credit Union is a state-chartered credit union based in Montgomery, Alabama, serving central and east Alabama and west Georgia with 18 branch locations. Originally founded in 1955 as Maxwell Federal Credit Union for Air Force personnel, it received a community charter in 1998 and became state-chartered in 2007, allowing broader membership. As of January 2021, MAX had $1.77 billion in assets and over 116,000 member owners, making it the 5th largest credit union in Alabama.

Mayo Employees Federal Credit Union (MEFCU) is a member-owned financial cooperative headquartered in Rochester, Minnesota, serving Mayo Clinic employees and their families since 1933. With over $1.35 billion in assets and approximately 72,800 members, MEFCU operates nine branch locations across four states. The credit union provides comprehensive financial services including checking, savings, lending, mortgages, and investment products.

Mazuma Credit Union is a member-owned, not-for-profit financial institution serving the Kansas City metropolitan area since 1948. Originally founded as the Kansas City National Federation of Federal Employees Credit Union, it expanded its membership eligibility in 1998 and adopted the name Mazuma (Yiddish for money). The credit union operates multiple branches across Kansas City and offers comprehensive banking services including checking, savings, loans, mortgages, and financial planning.

McCoy Federal Credit Union is one of the largest credit unions in Central Florida, headquartered in Orlando with approximately 80,000 members and over $1 billion in assets. Founded in 1954, it operates 15 branch locations across Orange, Osceola, Seminole, and Lake counties. The credit union is federally chartered and NCUA-insured, offering a full range of banking and financial services to its member-owned cooperative.

Members 1st Federal Credit Union is a federally chartered, member-owned credit union headquartered in Camp Hill, Pennsylvania, chartered in 1950. It serves over 260,000 members across more than 70 branches in central Pennsylvania, including Harrisburg, Mechanicsburg, Hershey, Lancaster, York, and Carlisle. The credit union operates under a community charter and extensive employer group list, with membership extending to residents and employees of more than 50 Pennsylvania counties.

Members Choice Credit Union is a not-for-profit financial cooperative with multiple locations across the United States. The largest and most prominent branch operates in the Houston, Texas area, serving ten surrounding counties, while other branches operate in Ashland, Kentucky (serving 33 counties in Eastern Kentucky) and Darke County, Ohio. The credit union offers savings, loans, mortgages, and other financial services to its members.

Members Cooperative Credit Union is a not-for-profit financial cooperative headquartered in Duluth, Minnesota, serving approximately 50,000 members across Minnesota and Wisconsin. Founded in 1936 as Cloquet Co-op Credit Union, it is the largest credit union based north of the Twin Cities and offers checking, savings, loans, and other financial services. The credit union operates multiple branches throughout northern Minnesota and Wisconsin counties.