- Machine Shop, Portsmouth
- Machine Shop & Tool Repair Service, Portsmouth
- Machinery And Equipment Manufacturers, 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
- Mammography Clinics, Portsmouth - Breast Cancer Screening
- Management Consultants & Services, Portsmouth
- Manicurists & Pedicurists, Portsmouth
- Manufacturers Agents & Representatives, Portsmouth
- Manufacturers Representative, Portsmouth - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Portsmouth
- Manufacturing Products, Portsmouth
- Marble, Portsmouth
- Marinas & Marina Services, Portsmouth
- Marine Contractors & Designers, Portsmouth
- Marine Engineers, Portsmouth
- Marine Salvage & Wrecking Services, Portsmouth
- Marine Supplies & Equipment, Portsmouth - Boat Supplies
- Marine Surveyors & Adjustors, 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
- Mastectomy Apparel, Forms, Prostheses & Supplies, Portsmouth
- Material Handling Equipment, Portsmouth - Conveyor Belt, Pallet Jack, Forklift, etc
- Mats & Matting, Portsmouth
- Mausoleums Developers, Portsmouth
- Maytag Appliances, Portsmouth
- Meat Market, Wholesale & Products, Portsmouth
- Mechanical Contractors, Portsmouth - Install, Service & Repair
- Mechanical Engineer, Portsmouth - Mechanical Engineering Service
- Medical & Dental Management, Portsmouth
- Medical & Health Service Organizations, Portsmouth
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Portsmouth
- Medical Management & Business Administration Service, Portsmouth
- Medical Supplies & Equipment, Portsmouth
- Medical Transcription Service, Portsmouth
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- Membership Sports & Recreation Clubs, Portsmouth
- Mental & Developmental Information & Referral Services, Portsmouth
- Mental Health Specialists, Portsmouth - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Portsmouth
- Messenger Service, Portsmouth - Message Receiving & Forwarding Service
- Metal Stampings Manufacturers, Portsmouth
- Methodist Church, Portsmouth
- Mexican Restaurants, Portsmouth
- Millwork Contractors, Portsmouth
- Mini & Self Storage, Portsmouth
- Mining, Portsmouth
- Ministries Church, Portsmouth
- Mirrors, Portsmouth - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Portsmouth
- Miscellaneous Household Item Repair, Portsmouth
- Miscellaneous Business Services, Portsmouth
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Portsmouth
- Miscellaneous Government, Portsmouth
- Miscellaneous Industry, Portsmouth
- Miscellaneous Manufacturing, Portsmouth
- Miscellaneous Metal Work Manufacturers, Portsmouth
- Miscellaneous Motor Vehicles, Portsmouth
- Miscellaneous Personal Services, Portsmouth
- Miscellaneous Photographers, Portsmouth
- Miscellaneous Professional, Portsmouth
- Model Trains, Portsmouth
- Monuments, Tombstones, Markers & Memorials, Portsmouth
- Mopeds, Scooter & Mini-Bikes Parts, Accessories & Dealers, Portsmouth
- Mortgage Bankers & Correspondents, Portsmouth
- Mortgage Companies, Portsmouth
- Mortgages & Loans, Portsmouth
- Motor Vehicle, Portsmouth
- Motor Vehicle Rental & Leasing, Portsmouth
- Motorcycle Parts, Accessories & Dealers, Portsmouth
- Motorized Bicycle & Scooter, Portsmouth
- Movie Theaters, Portsmouth
- Moving & Storage Supplies & Equipment, Portsmouth
- Moving Companies, Portsmouth
- Moving Truck Rental , Portsmouth
- Muffler Shop & Exhaust Systems, Portsmouth
- Museums, Portsmouth
- Music, Portsmouth
- Music Entertainment, Portsmouth
- Musical Instruments & Equipment Stores, Portsmouth
- Musical Recording Services, Portsmouth
- Musicians, Bands & Disc Jockeys, Portsmouth
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