- Squier, Knapp, Ochs13
- Squier, Knapp, Ochs Communications16
- Stegman/Sere Communications1
- Stephen Clouse and Associated Inc.1
- Stephen Clouse and Associates22
- Stephen Clouse and Associates, Inc.1
- Stephen Clouse/ Fremstad Group1
- Stevens, Reed, Curcio, and Company2
- Strategic Perceptions, Inc.1
- Strategy Group Media10
- Strother, Duffy and Strother, Ltd.22
- Struble and Oppel Communications28
- Struble and Totten Communications18
- Stuart Stevens Group13
- Summit Video Productions4
- Swinehart Productions8
- T and G4
- TRG Productions3
- TRIPPI MC MAHON and SQUIER1
- Television Newsfile, Inc.1
