- Machine Shop, Sandwich
- Machine Shop & Tool Repair Service, Sandwich
- Machinery Movers & Erectors, Sandwich
- Machinery, Supplies & Equipment - Business Supplies Related, Sandwich
- Mailing, Delivery & Courier Service, Sandwich
- Manufacturing, Sandwich
- Manufacturing Products, Sandwich
- Marriage & Family Counselors, Sandwich
- Martial Arts & Self Defense Schools, Sandwich
- Masonry Contractors, Sandwich - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Sandwich
- Medical Identification Jewelry, Sandwich
- Medical Supplies & Equipment, Sandwich
- Mental Health Specialists, Sandwich - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Sandwich
- Metal Buildings, Sandwich - Kits, Homes, Steel Buildings, etc
- Metal Perforating & Punching, Sandwich
- Metal Repair Service & Blacksmith, Sandwich - Iron Works
- Metal Stampings Manufacturers, Sandwich
- Mexican Restaurants, Sandwich
- Millwork Contractors, Sandwich
- Mirrors, Sandwich - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Government, Sandwich
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- Miscellaneous Manufacturing, Sandwich
- Miscellaneous Metal Work Manufacturers, Sandwich
- Miscellaneous Personal Services, Sandwich
- Miscellaneous Professional, Sandwich
- Mobile Home Contractors, Sandwich
- Mobile Home Improvements & Repairs, Sandwich
- Mobile Home Parks & Communities , Sandwich
- Modular & Mobile Homes For Sale, Sandwich - Manufactured Homes Sale & Service
- Moldings Materials, Sandwich
- Monuments, Tombstones, Markers & Memorials, Sandwich
- Mortgage Bankers & Correspondents, Sandwich
- Motor Vehicle, Sandwich
- Motor Vehicle Rental & Leasing, Sandwich
- Motorcycle & Motor Scooters Dealers, Repair & Service, Sandwich
- Motorcycle Parts, Accessories & Dealers, Sandwich
- Motorcycle Repair & Service, Sandwich
- Motorcycles Paint & Refinishing, Sandwich
- Movie Theaters, Sandwich
- Moving Supplies & Equipment Rental, Sandwich
- Moving Truck Rental , Sandwich
- Music, Sandwich
- Musical Instrument Rental, Sandwich - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Sandwich
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