- Machine Shop & Tool Repair Service, Bay Roberts
- Machinery, Supplies & Equipment - Construction & Contractor Related, Bay Roberts
- Magazine & Newspaper Stands, Bay Roberts - Dealers & Distributors
- Mailing, Delivery & Courier Service, Bay Roberts
- Major Appliances, Bay Roberts - Household & Kitchen
- Malls & Shopping Centers, Bay Roberts
- Management Consultants & Services, Bay Roberts
- Mandarin Restaurants, Bay Roberts
- Manufacturing, Bay Roberts
- Marine Supplies & Equipment, Bay Roberts - Boat Supplies
- Martial Arts & Self Defense Schools, Bay Roberts
- Masonry Contractors, Bay Roberts - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Bay Roberts
- Massage Therapists & Professional, Bay Roberts
- Massage Therapy, Bay Roberts
- Mechanical Engineer, Bay Roberts - Mechanical Engineering Service
- Membership Sports & Recreation Clubs, Bay Roberts
- Mental Health Specialists, Bay Roberts - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merchandise Sales Events, Bay Roberts
- Mini & Self Storage, Bay Roberts
- Mining, Bay Roberts
- Mining Development & Exploration, Bay Roberts
- Mining Services, Bay Roberts
- Miscellaneous Business Services, Bay Roberts
- Miscellaneous Personal Services, Bay Roberts
- Miscellaneous Professional, Bay Roberts
- Mortgage Bankers & Correspondents, Bay Roberts
- Mortgage Brokers, Bay Roberts
- Motor Vehicle, Bay Roberts
- Motor Vehicle Rental & Leasing, Bay Roberts
- Muffler Shop & Exhaust Systems, Bay Roberts
- Music, Bay Roberts
- Music Lessons, Bay Roberts
- Music Lessons - Vocal, Bay Roberts
- Musical Instruments & Equipment Stores, Bay Roberts
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