- Machine Shop & Tool Repair Service, Portsmouth
- Machinery, Supplies & Equipment - Business Production Related, Portsmouth
- Machinery, Supplies & Equipment - Business Supplies Related, Portsmouth
- Machinery, Supplies & Equipment - Construction & Contractor Related, Portsmouth
- Mailbox Rental Services, Portsmouth
- Mailing, Delivery & Courier Service, Portsmouth
- Malpractice Attorneys & Lawyers, Portsmouth
- Management Consultants & Services, Portsmouth
- Manicurists & Pedicurists, Portsmouth
- Manufacturing, Portsmouth
- Manufacturing Products, Portsmouth
- Marine Pilot & Operator Service, Portsmouth
- Masonry Materials & Supplies, Portsmouth
- Massage Therapists & Professional, Portsmouth
- Massage Therapy, Portsmouth
- Medical & Dental Management, Portsmouth
- Medical Billing Services, Portsmouth
- Medical Supplies & Equipment, Portsmouth
- Membership Sports & Recreation Clubs, Portsmouth
- Mental Health Specialists, Portsmouth - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Portsmouth
- Mexican Restaurants, Portsmouth
- Mini & Self Storage, Portsmouth
- Mining, Portsmouth
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- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Portsmouth
- Miscellaneous Government, 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
- Monuments, Tombstones, Markers & Memorials, Portsmouth
- Mortgage Bankers & Correspondents, Portsmouth
- Mortgage Brokers, Portsmouth
- Mortgage Companies, Portsmouth
- Mortgage Feasibility Consultants, Portsmouth
- Mortgages & Loans, 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 Truck Rental , Portsmouth
- Museums, Portsmouth
- Music, Portsmouth
- Musical Instruments & Equipment Stores, Portsmouth
- Musical Instruments - Guitars, Portsmouth
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