- Machine Shop, Cornwall
- Machine Shop & Tool Repair Service, Cornwall
- Machinery, Supplies & Equipment - Business Production Related, Cornwall
- Machinery, Supplies & Equipment - Business Supplies Related, Cornwall
- Machinery, Supplies & Equipment - Construction & Contractor Related, Cornwall
- Magazine & Newspaper Stands, Cornwall - Dealers & Distributors
- Magicians & Hypnotist Entertainers, Cornwall
- Mail Delivery Service, Cornwall
- Mailing, Delivery & Courier Service, Cornwall
- Major Appliances, Cornwall - Household & Kitchen
- Malls & Shopping Centers, Cornwall
- Management Consultants & Services, Cornwall
- Manicurists & Pedicurists, Cornwall
- Manufacturers Agents & Representatives, Cornwall
- Manufacturers Representative, Cornwall - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Cornwall
- Manufacturing Products, Cornwall
- Marinas & Marina Services, Cornwall
- Marine Contractors & Designers, Cornwall
- Marine Supplies & Equipment, Cornwall - Boat Supplies
- Marine Surveyors & Adjustors, Cornwall
- Marriage & Family Counselors, Cornwall
- Martial Arts & Self Defense Schools, Cornwall
- Masonry Contractors, Cornwall - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Cornwall
- Massage Therapists & Professional, Cornwall
- Massage Therapy, Cornwall
- Mastectomy Apparel, Forms, Prostheses & Supplies, Cornwall
- Meat Market, Wholesale & Products, Cornwall
- Mechanical Contractors, Cornwall - Install, Service & Repair
- Medical Alert Systems, Cornwall - Medical Alarms - PERS
- Medical Groups & Clinics, Cornwall - Medical & Health Centers
- Medical Supplies & Equipment, Cornwall
- Membership Sports & Recreation Clubs, Cornwall
- Men's & Boys Clothing & Accessories Stores, Cornwall
- Mens & Boys Belts & Suspenders, Cornwall
- Mens & Womens Clothing, Cornwall
- Mental Health Specialists, Cornwall - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merchandise Sales Events, Cornwall
- Metal Buildings, Cornwall - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Cornwall - Iron Works
- Mexican Restaurants, Cornwall
- Milk Bars, Cornwall
- Mini & Self Storage, Cornwall
- Mining, Cornwall
- Mining Equipment & Supplies, Cornwall
- Mirrors, Cornwall - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Cornwall
- Miscellaneous Agriculture, Cornwall
- Miscellaneous Business Services, Cornwall
- Miscellaneous Government, Cornwall
- Miscellaneous Industry, Cornwall
- Miscellaneous Manufacturing, Cornwall
- Miscellaneous Personal Services, Cornwall
- Miscellaneous Professional, Cornwall
- Money Transfer Service, Cornwall
- Monuments, Tombstones, Markers & Memorials, Cornwall
- Mortgage Bankers & Correspondents, Cornwall
- Motion Picture & Television Production Services, Cornwall
- Motion Picture Dists & Producers, Cornwall
- Motion Picture Pre & Post Production Services, Cornwall
- Motor Vehicle, Cornwall
- Motor Vehicle Rental & Leasing, Cornwall
- Motorcycle Parts, Accessories & Dealers, Cornwall
- Movie Theaters, Cornwall
- Moving & Storage Supplies & Equipment, Cornwall
- Moving Companies, Cornwall
- Moving Supplies & Equipment Rental, Cornwall
- Moving Truck Rental , Cornwall
- Muffler Shop & Exhaust Systems, Cornwall
- Museums, Cornwall
- Music, Cornwall
- Music Schools, Cornwall
- Musical Instruments & Equipment Stores, Cornwall
- Musical Recording Services, Cornwall
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