- Morris and Carrick, Inc..1
- Murphy Putnam Media, Inc.5
- Murphy, Pintak and Gautier Agency, Inc.21
- Murphy, Putnam, Shorr and Partners2
- Murray and Thoren1
- Muscogee (Creek) Nation1
- Muscogee (Creek) Nation, Oklahoma96
- National Media1
- National Media, Inc.7
- National Voter Contact39
- Navajo Indians74
- Navajo Nation33
- Navajo Tribe of Arizona, New Mexico & Utah106
- Navajo Tribe of Arizona, New Mexico & Utah, New Mexico & Utah3
- New Sounds, Inc.1
- Noerdlinger Associations1
- Noerdlinger and Associates20
- North Woods Advertising1
- Northwest Creative Arts1
- Northwest Productions1
