| Millard County Credit Union | Utah |
| Millbury Federal Credit Union | Massachusetts |
| Millbury National Bank | Massachusetts |
| Millbury Savings Bank | Massachusetts |
| Mill City Credit Union | Minnesota |
| Milledgeville Community Credit Union | Illinois |
| Milledgeville State Bank | Illinois |
| Millennium Bank | Illinois |
| Millennium Bank | Kansas |
| Miller Transporters Federal Credit Union | Mississippi |
| Millington Bank | New Jersey |
| Mills42 Federal Credit Union | Massachusetts |
| Mills County State Bank | Texas |
| Mill Town Credit Union | Washington |
| Millville Savings and Loan Association | New Jersey |
| Milton Savings Bank | Pennsylvania |
| Mil-Way Federal Credit Union | Arkansas |
| Minden Exchange Bank & Trust Company | Nebraska |
| Mineola Community Bank | Texas |
| Miner County Bank | South Dakota |
| Miners Exchange Bank | Virginia |
| Miners & Merchants Bank | West Virginia |
| Minerva Area Federal Credit Union | Ohio |
| Mingo County Education Federal Credit Union | West Virginia |
| Minnco Credit Union | Minnesota |
| Minnequa Works Credit Union | Colorado |
| Minnesota Bank & Trust | Minnesota |
| Minnesota Catholic Credit Union | Minnesota |
| Minnesota First Credit and Savings | Minnesota |
| Minnesota Lakes Bank | Minnesota |
| Minnesota National Bank | Minnesota |
| Minnesota Ore Operations Employees Credit Union | Minnesota |
| Minnesota Power Employees Credit Union | Minnesota |
| Minnesota Valley Federal Credit Union | Minnesota |
| MinnStar Bank | Minnesota |
| Minnwest Bank | Minnesota |
| Minot Area Schools Federal Credit Union | North Dakota |
| Minster Bank | Ohio |
| Mint Valley Federal Credit Union | Washington |
| Minuteman Federal Credit Union | South Dakota |
| Miramar Federal Credit Union | California |
| Mission Bank | California |
| Mission Bank | Arizona |
| Mission City Federal Credit Union | California |
| Mission Federal Credit Union | California |
| Mission National Bank | California |
| Mission Valley Bank | California |
| Mississippi Central Federal Credit Union | Mississippi |
| Mississippi College Employees Credit Union | Mississippi |
| Mississippi County Savings and Loan Association | Missouri |
| Mississippi DHS Federal Credit Union | Mississippi |
| Mississippi Farm Bureau Employees Credit Union | Mississippi |
| Mississippi Federal Credit Union | Mississippi |
| Mississippi Highway Safety Patrol Federal Credit Union | Mississippi |
| Mississippi National Guard Federal Credit Union | Mississippi |
| Mississippi Postal Employees Federal Credit Union | Mississippi |
| Mississippi Public Employees Credit Union | Mississippi |
| Mississippi River Bank | Louisiana |
| Mississippi Telco Federal Credit Union | Mississippi |
| Missoula Federal Credit Union | Montana |
| Missouri Baptist Credit Union | Missouri |
| Missouri Central Credit Union | Missouri |
| Missouri Credit Union | Missouri |
| Missouri Valley Federal Credit Union | Missouri |
| Mitchell Bank | Wisconsin |
| MIT Federal Credit Union | Massachusetts |
| Mitsubishi UFJ Trust & Banking Corporation (U.S.A.) | New York |
| Mizuho Bank (USA) | New York |
| Mizuho Trust & Banking Co. USA | New York |
| MM Employees Federal Credit Union | Montana |
| MN-CPPC Federal Credit Union | Maryland |
| mobank | Missouri |
| Mobile Educators Credit Union | Alabama |
| Mobile Government Employees Credit Union | Alabama |
| Mobile Postal Credit Union | Alabama |
| Mobility Credit Union | Texas |
| Mobiloil Federal Credit Union | Texas |
| Mocse Federal Credit Union | California |
| Modern Bank | New York |
| Modern Employees Federal Credit Union | Kentucky |
| Modesto's First Federal Credit Union | California |
| M-O Federal Credit Union | South Dakota |
| Moffat County Schools Federal Credit Union | Colorado |
| Mohave Community Federal Credit Union | Arizona |
| Mohave State Bank | Arizona |
| Mohawk Progressive Federal Credit Union | New York |
| Mohawk Valley Federal Credit Union | New York |
| Mojave Plant Employees Federal Credit Union | California |
| Mokelumne Federal Credit Union | California |
| Molex Employees Federal Credit Union | Illinois |
| Moline Municipal Credit Union | Illinois |
| Molokai Community Federal Credit Union | Hawaii |
| Monad Federal Credit Union | Washington |
| Monarch Bank | Virginia |
| Monarch Federal Credit Union | Ohio |
| Monessen School Employees Federal Credit Union | Pennsylvania |
| Money Federal Credit Union | New York |
| Money One Federal Credit Union | Maryland |
| Monmouth County Postal Employees Credit Union | New Jersey |
| Monmouth Federal Credit Union | Maine |