| Mount Vernon NY Postal Employees Federal Credit Union | New York |
| Mount Zion A.M.E. Church Federal Credit Union | New Jersey |
| Mower County Catholic Parishes Credit Union | Minnesota |
| Mower County Employees Credit Union | Minnesota |
| MPD Community Credit Union | Tennessee |
| MRV Banks | Missouri |
| MSA Employees Federal Credit Union | Pennsylvania |
| MSBA Employees Federal Credit Union | New York |
| MSD Federal Credit Union | Kentucky |
| MSTC Federal Credit Union | Mississippi |
| MSU Federal Credit Union | Kentucky |
| Mt. Airy Baptist Church Federal Credit Union | District of Columbia |
| M&T Bank | New York |
| Mt Carmel Church Federal Credit Union | Texas |
| MTC Federal Credit Union | South Carolina |
| MTCU | Texas |
| Mt Gilead Federal Credit Union | District of Columbia |
| Mt. Jezreel Federal Credit Union | Maryland |
| Mt Lebanon Federal Credit Union | Pennsylvania |
| Mt. McKinley Bank | Alaska |
| Mt. Rainier Federal Credit Union | Washington |
| Mt. Taylor Federal Credit Union | New Mexico |
| Mt. Zion Credit Union | Illinois |
| Mt Zion Indianapolis Federal Credit Union | Indiana |
| Mt Zion Woodlawn Federal Credit Union | Ohio |
| Muenster State Bank | Texas |
| Muhlenberg Community Hospital Credit Union | Kentucky |
| Muleshoe State Bank | Texas |
| Multiple Employee Group Federal Credit Union | Georgia |
| MUNA Federal Credit Union | Mississippi |
| Muncie Federal Credit Union | Indiana |
| Municipal Credit Union | New York |
| Municipal Credit Union | Wisconsin |
| Municipal Employees Credit Union | Indiana |
| Municipal Employees Credit Union of Baltimore | Maryland |
| Municipal Employees Credit Union of Oklahoma City | Oklahoma |
| Municipal Employees Federal Credit Union | Louisiana |
| Municipal Trust and Savings Bank | Illinois |
| Muni Employees Credit Union | Iowa |
| Munseetown Community Federal Credit Union | Indiana |
| Murphy Bank | California |
| Murphy Credit Union | Minnesota |
| Murphy-Wall State Bank and Trust Company | Illinois |
| Musicians Federal Credit Union | Texas |
| Musicians' Interguild Credit Union | California |
| Muskegon Co Op Federal Credit Union | Michigan |
| Muskegon Federal Credit Union | Michigan |
| Muskegon Patternmakers Federal Credit Union | Michigan |
| Muskegon St Joseph Federal Credit Union | Michigan |
| Muskogee Federal Credit Union | Oklahoma |
| MutualBank | Indiana |
| Mutual Bank | Massachusetts |
| Mutual Credit Union | Mississippi |
| Mutual Federal Bank | Illinois |
| Mutual Federal Savings Bank | Ohio |
| Mutual First Federal Credit Union | Nebraska |
| Mutual of Omaha Bank | Nebraska |
| MutualOne Bank | Massachusetts |
| Mutual Savings and Loan Association | Louisiana |
| Mutual Savings Association | Kansas |
| Mutual Savings Bank | Indiana |
| Mutual Savings Bank | South Carolina |
| Mutual Savings Credit Union | Alabama |
| Mutual Savings Credit Union | Georgia |
| Mutual Security Credit Union | Connecticut |
| MUW Employees Federal Credit Union | Mississippi |
| MVB Bank | West Virginia |
| MWABank | Illinois |
| MWD Federal Credit Union | California |
| MWPH Grand Lodge of Illinois Federal Credit Union | Illinois |
| MWRD Employees' Credit Union | Illinois |
| My Bank | New Mexico |
| My Choice Federal Credit Union | Oklahoma |
| Mycom Federal Credit Union | Massachusetts |
| My Community Federal Credit Union | Texas |
| My Credit Union | California |
| My Credit Union | Texas |
| My Healthcare Federal Credit Union | Florida |
| My Personal Credit Union | Michigan |
| My Postal Credit Union | Michigan |
| M.Y. Safra Bank | New York |