| The Marketing Minute | District of Columbia |
| The Marketing Squad | |
| The MASCC, LLC | |
| The Master Switch | |
| The Master's University | California |
| The Matchbox | |
| The MCS Group, Inc. | Pennsylvania |
| The Mead Group | Washington |
| The Mechanism | |
| The Media Artistry | |
| The Media Captain, LLC | |
| The Media Kitchen | Georgia |
| The Medical Memory | Arizona |
| The Meeech Approach | |
| The Meet Group, Inc. | |
| The Meetings Hub | |
| The Mega Agency | Rhode Island |
| The Mentor Method, Inc. | Virginia |
| The Mesa Group | Texas |
| The Miami SEO Company | |
| The Mighty Mo! Design Co. | |
| The Mind Company | |
| The Mirror Megaverse, Inc. | Florida |
| The MMC Agency | |
| The Modern College of Design | Ohio |
| The Modern Firm, LLC | Michigan |
| The Mom Project | Illinois |
| The Montgomerry Group | Oklahoma |
| The Montgomery Summit | |
| The Monument Group, LLC | |
| The Moonshot Factory | |
| The Moran Group | |
| The Motion Agency | |
| The Motion Monitor | |
| The Moxie Agency, LLC | Utah |
| The Moyer Group, Inc. | Georgia |
| The Muse | New York |
| The MX Group | |
| The National Association of Telecommunications Officers and Advisors | Virginia |
| The NDSI Group, Inc. | Florida |
| The Neat Company | Pennsylvania |
| The Nerd Stuff | |
| The Nerve Web Design | Maine |
| The Net Effect, LLC | Alabama |
| The Net Impact | Missouri |
| The Net Purpose | Florida |
| The Netmen Corporation | Florida |
| The Network Cabling Directory | California |
| The Network People, Inc. | Michigan |
| The Network Pro, LLC | California |