- Machinery Movers & Erectors, Portsmouth
- Machinery, Supplies & Equipment - Business Production Related, Portsmouth
- Machinery, Supplies & Equipment - Business Supplies Related, Portsmouth
- Management Consultants & Services, Portsmouth
- Manicurists & Pedicurists, Portsmouth
- Manufacturing, Portsmouth
- Manufacturing Services, Portsmouth
- Marinas & Marina Services, Portsmouth
- Marine Contractors & Designers, Portsmouth
- Marine Electronic Equipment, Portsmouth
- Marine Products And Services, Portsmouth
- Marine Repair & Service Stations, Portsmouth
- Marine Supplies & Equipment, Portsmouth - Boat Supplies
- Marine Supplies & Equipment Repair, Portsmouth - Boat Supplies & Equipment
- Marriage & Family Counselors, Portsmouth
- Martial Arts & Self Defense Schools, Portsmouth
- Masonry Contractors, Portsmouth - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Portsmouth
- Massage Therapy, Portsmouth
- Material Handling & Heavy Machinery & Equipment, Portsmouth
- Mechanical Seals, Portsmouth
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- Medical Attorneys & Lawyers, Portsmouth
- Medical Attorneys & Lawyers, Portsmouth
- Medical Lawyers & Attorneys, Portsmouth
- Membership Sports & Recreation Clubs, Portsmouth
- Mental Health Clinics, Portsmouth - Treatment Centers
- Mental Health Specialists, Portsmouth - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Portsmouth
- Methodist Church, Portsmouth
- Mini & Self Storage, Portsmouth
- Miscellaneous Business Product Repair, Portsmouth
- Miscellaneous Government, Portsmouth
- Miscellaneous Personal Services, Portsmouth
- Miscellaneous Professional, Portsmouth
- Modular & Mobile Homes For Sale, Portsmouth - Manufactured Homes Sale & Service
- Motion Picture & Television Production Services, Portsmouth
- Motor Vehicle, Portsmouth
- Motor Vehicle Rental & Leasing, Portsmouth
- Moving Companies, Portsmouth
- Moving Truck Rental , Portsmouth
- Music Entertainment, Portsmouth
- Musicians, Bands & Disc Jockeys, Portsmouth
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