- Machine Shop & Tool Repair Service, Biddeford
- Machine Tools , Biddeford
- Machinery, Supplies & Equipment - Business Production Related, Biddeford
- Machinery, Supplies & Equipment - Business Supplies Related, Biddeford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Biddeford
- Mailing, Delivery & Courier Service, Biddeford
- Major Appliances, Biddeford - Household & Kitchen
- Management Consultants & Services, Biddeford
- Manicurists & Pedicurists, Biddeford
- Manufacturers Agents & Representatives, Biddeford
- Manufacturers Representative, Biddeford - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Biddeford
- Manufacturing Equipment & Supplies, Biddeford
- Manufacturing Products, Biddeford
- Marine Supplies & Equipment, Biddeford - Boat Supplies
- Marriage & Family Counselors, Biddeford
- Massage Therapists & Professional, Biddeford
- Massage Therapy, Biddeford
- Material Handling & Heavy Machinery & Equipment, Biddeford
- Mats & Matting, Biddeford
- Mattress & Bedspring Manufacturers, Biddeford
- Mechanical Engineer, Biddeford - Mechanical Engineering Service
- Medical & Health Service Organizations, Biddeford
- Medical Equipment Manufacturers, Biddeford
- Medical Supplies & Equipment, Biddeford
- Membership Sports & Recreation Clubs, Biddeford
- Mental Health Specialists, Biddeford - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merchandise Sales Events, Biddeford
- Metal Coating & Allied Services, Biddeford
- Mexican Restaurants, Biddeford
- Middle Eastern Restaurants, Biddeford
- Mining, Biddeford
- Mirrors, Biddeford - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Agriculture, Biddeford
- Miscellaneous Business Services, Biddeford
- Miscellaneous Government, Biddeford
- Miscellaneous Industry, Biddeford
- Miscellaneous Manufacturing, Biddeford
- Miscellaneous Personal Services, Biddeford
- Miscellaneous Professional, Biddeford
- Mobile Home Parks & Communities , Biddeford
- Molds, Biddeford
- Monuments, Tombstones, Markers & Memorials, Biddeford
- Mortgage Bankers & Correspondents, Biddeford
- Motion Picture Pre & Post Production Services, Biddeford
- Motor Vehicle, Biddeford
- Motor Vehicle Rental & Leasing, Biddeford
- Movie Theaters, Biddeford
- Moving Companies, Biddeford
- Moving Truck Rental , Biddeford
- Muffler Shop & Exhaust Systems, Biddeford
- Music, Biddeford
- Musical Instruments & Equipment Stores, Biddeford
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