- Machine Shop, Portsmouth
- Machine Shop & Tool Repair Service, Portsmouth
- Machinery And Equipment Manufacturers, Portsmouth
- Machinery Movers & Erectors, Portsmouth
- Machinery, Supplies & Equipment - Business Production Related, Portsmouth
- Machinery, Supplies & Equipment - Business Supplies Related, Portsmouth
- Machinery, Supplies & Equipment - Construction & Contractor Related, Portsmouth
- Magazine & Newspaper Stands, Portsmouth - Dealers & Distributors
- Mailbox Rental Services, Portsmouth
- Mailboxes Retail, Portsmouth
- Mailing, Delivery & Courier Service, Portsmouth
- Maintenance, Cleaning & Sanitation, Portsmouth
- Major Appliances, Portsmouth - Household & Kitchen
- Malls & Shopping Centers, Portsmouth
- Management Consultants & Services, Portsmouth
- Manicurists & Pedicurists, Portsmouth
- Manufacturers Agents & Representatives, Portsmouth
- Manufacturers Representative, Portsmouth - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Portsmouth
- Manufacturing & Industrial Consultants, Portsmouth
- Manufacturing Equipment & Supplies, Portsmouth
- Manufacturing Services, Portsmouth
- Marble, Portsmouth
- Marine Contractors & Designers, Portsmouth
- Marine Electronic Equipment, Portsmouth
- Marine Engineers, Portsmouth
- Marine Hardware, Portsmouth
- Marine Products And Services, Portsmouth
- Marine Services, Portsmouth
- Marine Supplies & Equipment, Portsmouth - Boat Supplies
- Market Research & Analysis , Portsmouth - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Portsmouth
- Marriage & Family Counselors, Portsmouth
- Martial Arts & Self Defense Schools, Portsmouth
- Masonry Contractors, Portsmouth - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Portsmouth
- Massage Therapists & Professional, Portsmouth
- Massage Therapy, Portsmouth
- Massage Therapy Relaxation, Portsmouth
- Material Handling & Heavy Machinery & Equipment, Portsmouth
- Meat Market, Wholesale & Products, Portsmouth
- Mechanical Contractors, Portsmouth - Install, Service & Repair
- Mechanical Engineer, Portsmouth - Mechanical Engineering Service
- Medical & Health Service Organizations, Portsmouth
- Medical Supplies & Equipment, Portsmouth
- Membership Organizations, Portsmouth
- Membership Sports & Recreation Clubs, Portsmouth
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- Mental Health Specialists, Portsmouth - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Portsmouth
- Merchandising & Pricing Equipment, Portsmouth
- Metaphysical Churches, Portsmouth
- Methodist Church, Portsmouth
- Mexican Restaurants, Portsmouth
- Microfilm & Imaging Service, Equipment & Supplies , Portsmouth
- Middle Eastern Restaurants, Portsmouth
- Mildew Removal & Control, Portsmouth - Mold Removal
- Milk & Milk Products, Portsmouth
- Mind-Body Massage, Portsmouth
- Mini & Self Storage, Portsmouth
- Mining, Portsmouth
- Mirrors, Portsmouth - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Portsmouth
- Miscellaneous Business Services, Portsmouth
- Miscellaneous Government, Portsmouth
- Miscellaneous Manufacturing, Portsmouth
- Miscellaneous Personal Services, Portsmouth
- Miscellaneous Photographers, Portsmouth
- Miscellaneous Professional, Portsmouth
- Mobile Home Parks & Communities , Portsmouth
- Modular & Mobile Homes For Sale, Portsmouth - Manufactured Homes Sale & Service
- Money Transfer Service, Portsmouth
- Monuments, Tombstones, Markers & Memorials, Portsmouth
- Mortgage Bankers & Correspondents, Portsmouth
- Mortgages & Loans, Portsmouth
- Motion Picture & Television Production Services, Portsmouth
- Motion Picture Pre & Post Production Services, Portsmouth
- Motion Pictures Video Tape Duplication & Transfer Services, Portsmouth
- Motor Vehicle, Portsmouth
- Motor Vehicle Rental & Leasing, Portsmouth
- Motorcycle Parts, Accessories & Dealers, Portsmouth
- Movie Theaters, Portsmouth
- Moving & Storage Supplies & Equipment, Portsmouth
- Moving Companies, Portsmouth
- Moving Supplies & Equipment Rental, Portsmouth
- Moving Truck Rental , Portsmouth
- Muffler Shop & Exhaust Systems, Portsmouth
- Multimedia Publishers, Portsmouth - Multimedia Services & Systems
- Museums, Portsmouth
- Music, Portsmouth
- Music Lessons, Portsmouth
- Music Lessons - Instrumental, Portsmouth
- Musical Instruments & Equipment Stores, Portsmouth
- Musical Instruments - Guitars, Portsmouth
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