- Milliken, Sam'l B.1
- Minute Men1
- Mitchell, Isaac1
- Monroe, James1
- Monticello Female Institute (Fairfield County, S.C.)1
- Morgan, Philip Hugh1
- Morgan, Philip Hugh, 1890-19841
- Morgan, William C.1
- Morrison, John D.1
- Morse, A. A.1
- Morse, Cyrus1
- Moseley, Elise1
- Moses, Jr., Franklin J.1
- Mount Vernon Ladies' Association of the Union1
- Mt. Pleasant and Sullivan's Island Ferry Company County (S.C.)1
- Murchinson, Collin Campbell1
- Music Teachers National Association1
- NOW National Action Center1
- Nagel and Mr. Dempster1
- Nance, Fredk. A.1