- Medifacts International
- MedStar Montgomery Medical Center
- MedStar Southern Maryland Hospital Center
- Meeting and Conference Solutions Inc
- Memory Chapel Funeral Home
- Meritus Health
- MIEMSS Maryland Institute for EMSS)
- Milstone Biomedical Associates
- MIMS International
- Montgomery County Government
- Montgomery County-MD
- NAT Geospatial - Intelligence
- National 4-H Council
- National Alliance for Caregiving
- National Association of Black Accountants Inc.
- National Association of Catering Executives
- National Association of Enrolled Agents
- National Association of Pastoral Musicians
- National Association of Professional Geriatric Care Managers
- National Black Nurses Association
- National Dental Association
- National Electrical Contractors Association
- National Institutes of Health
- NCJRS
- Neighborcare
- Neurofibromatosis, Inc.
- Nieto Engineering, Inc.
- NIH
- NIH-NIAID-DAIT
- Northrop Grumman IT Health Solution and Services
- Notter Consulting
- Nurse Practitioner Alternative, Inc.
- O'Callaghan Hotel Annapolis
- Omniti
- Opnet
- Optometrist
- Osteogenesis Imperfecta Foundation
- Otsuka Maryland Research Institute, Inc.
- Paradise Plaza Inn
- Park West Medical Center
- Peachtree Promotions
- Peninsula Regional Medical Center
- Pepsi Cola Bottling Group
- PGA 1st Tee Chapter
- Pharmaceutical Research Plus
- Phillips Annapolis Harbor
- Physicians Practice
- Pioneer Healthcare Services, Inc.
- Polygon Group
- Potomac Digiteck