- MacWilliams, Robinson and Partners1
- MediaPartners1
- Menninger, Karl A. (Karl Augustus), 1893-19901
- Mitchell, George J. (George John), 1933-1
- Moore, Mary Tyler, 1936-20171
- Morris and Carrick1
- Murray and Thoren1
- Muscogee (Creek) Nation1
- Nagle, David R. (David Ray), 1943-1
- National Association of Rehabilitation Facilities (U.S.)1
- National Endowment for the Humanities1
- National Federation of Nursing Specialty Organizations1
- National Organization on Disability (U.S.)1
- National Wildlife Federation1
- Oba, Dayna1
- Obey, David R.1
- Paralyzed Veterans of America1
- Perkins, Carl C. (Carl Christopher), 1954-1
- Politics, Inc.1
- Pomeroy Creative Source1
