- Machinery Movers & Erectors, Mahone Bay
- Machinery, Supplies & Equipment - Construction & Contractor Related, Mahone Bay
- Manufactured & Mobile Home Movers & Transporting, Mahone Bay
- Manufacturing, Mahone Bay
- Marine & Boat Products, Mahone Bay
- Marine Supplies & Equipment, Mahone Bay - Boat Supplies
- Masonry Materials & Supplies, Mahone Bay
- Massage Therapists & Professional, Mahone Bay
- Massage Therapy, Mahone Bay
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- Medical & Health Service Organizations, Mahone Bay
- Men's Clothing Stores, Mahone Bay - Clothes & Accessories
- Mini & Self Storage, Mahone Bay
- Miscellaneous Agriculture, Mahone Bay
- Miscellaneous Personal Services, Mahone Bay
- Motor Vehicle, Mahone Bay
- Motorcycle Parts, Accessories & Dealers, Mahone Bay
- Museums, Mahone Bay
- Musical Instruments Repair, Sales & Service, Mahone Bay
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