| Metz Banking Company | Missouri |
| MGE Credit Union | Wisconsin |
| MG Employees Federal Credit Union | Ohio |
| Miami Federal Credit Union | Florida |
| Miami Firefighters Federal Credit Union | Florida |
| Miami Postal Service Credit Union | Florida |
| Miami Savings Bank | Ohio |
| Miami University Community Federal Credit Union | Ohio |
| Michael Baker Jr Federal Credit Union | Pennsylvania |
| Michigan Coastal Credit Union | Michigan |
| Michigan Columbus Federal Credit Union | Michigan |
| Michigan Community Credit Union | Michigan |
| Michigan Educational Credit Union | Michigan |
| Michigan First Credit Union | Michigan |
| Michigan One Community Credit Union | Michigan |
| Michigan Schools and Government Credit Union | Michigan |
| Michigan State University Federal Credit Union | Michigan |
| Michigan Tech Employees Federal Credit Union | Michigan |
| Michoud Credit Union | Louisiana |
| Mico Employees Credit Union | Minnesota |
| Mid America Bank | Missouri |
| Mid America Bank | Wisconsin |
| Mid-America Bank | Kansas |
| Mid America Bank & Trust Company | Missouri |
| MidAmerica National Bank | Illinois |
| Mid American Credit Union | Kansas |
| Mid-Atlantic Federal Credit Union | Maryland |
| Mid Carolina Credit Union | South Carolina |
| Mid-Central Federal Savings Bank | Minnesota |
| MidCoast Community Bank | Delaware |
| Midcoast Federal Credit Union | Maine |
| MidCountry Bank | Illinois |
| MiddConn Federal Credit Union | Connecticut |
| Mid Delta Credit Union | Mississippi |
| Middlesex County Employees Federal Credit Union | New Jersey |
| Middlesex-Essex Postal Employees Federal Credit Union | Massachusetts |
| Middlesex Federal Savings | Massachusetts |
| Middlesex Savings Bank | Massachusetts |
| Middle Tennessee Federal Credit Union | Tennessee |
| Middleton Community Bank | Wisconsin |
| Middletown Area Schools Credit Union | Ohio |
| Middletown State Bank | Illinois |
| Middletown Valley Bank | Maryland |
| Mid East Tennessee Community Credit Union | Tennessee |
| MidFirst Bank | Oklahoma |
| MIDFLORIDA Credit Union | Florida |
| Mid-Hudson Valley Federal Credit Union | New York |
| Mid-Illini Credit Union | Illinois |
| Mid-Kansas Credit Union | Kansas |
| Midland Community Bank | Illinois |
| Midland Co-Op Credit Union | Minnesota |
| Midland Credit Union | Iowa |
| Midland Federal Savings and Loan Association | Illinois |
| Midland Municipal Employees Credit Union | Texas |
| Midland National Bank | Kansas |
| Midland States Bank | Illinois |
| MidMinnesota Federal Credit Union | Minnesota |
| Mid-Missouri Bank | Missouri |
| Mid Missouri Credit Union | Missouri |
| Mid Oregon Federal Credit Union | Oregon |
| Mid Penn Bank | Pennsylvania |
| Mid Plains Credit Union | Kansas |
| MidSouth Bank | Alabama |
| MidSouth Bank | Louisiana |
| Midsouth Community Federal Credit Union | Georgia |
| Mid-Southern Savings Bank | Indiana |
| Midstate Community Bank | Maryland |
| Mid-State Federal Credit Union | New Jersey |
| Midstates Bank | Iowa |
| Mid-Tex Federal Credit Union | Texas |
| Midvalley Federal Credit Union | Utah |
| Midway Federal Credit Union | Virginia |
| Midwest America Federal Credit Union | Indiana |
| Midwest Bank | Illinois |
| Midwest Bank | Minnesota |
| Midwest Bank | Nebraska |
| Midwest BankCentre | Missouri |
| Midwest Carpenters & Millwrights Federal Credit Union | Indiana |
| Midwest Community Bank | Kansas |
| Midwest Community Bank | Illinois |
| Midwest Community Credit Union | Iowa |
| Midwest Community Federal Credit Union | Ohio |
| Midwest Credit Union | Missouri |
| Midwestern State University Credit Union | Texas |
| Midwest Family Federal Credit Union | Indiana |
| Midwest Federal Employees Credit Union | Iowa |
| Midwest Heritage Bank | Iowa |
| Midwest Independent Bank | Missouri |
| MidWestOne Bank | Iowa |
| Midwest Operating Engineers Credit Union | Illinois |
| Midwest Regional Bank | Missouri |
| Midwest Regional Credit Union | Kansas |
| Mifflinburg Bank & Trust | Pennsylvania |
| Mifflin County Savings Bank | Pennsylvania |
| Mildred Mitchell-Bateman Hospital Federal Credit Union | West Virginia |
| Mile High Federal Credit Union | Montana |
| Miles City Federal Credit Union | Montana |
| Milford Building and Loan Association | Illinois |
| Milford Federal Savings and Loan Association | Massachusetts |
| Milford Memorial Federal Credit Union | Delaware |