- Machine Shop, Shelton
- Machine Shop & Tool Repair Service, Shelton
- Machinery, Supplies & Equipment - Business Production Related, Shelton
- Machinery, Supplies & Equipment - Business Supplies Related, Shelton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Shelton
- Mailing, Delivery & Courier Service, Shelton
- Maintenance, Cleaning & Sanitation, Shelton
- Major Appliances, Shelton - Household & Kitchen
- Management Consultants & Services, Shelton
- Manicurists & Pedicurists, Shelton
- Manufacturers Agents & Representatives, Shelton
- Manufacturers Representative, Shelton - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Shelton
- Manufacturing Products, Shelton
- Marinas & Marina Services, Shelton
- Marine Products And Services, Shelton
- Marine Repair & Service Stations, Shelton
- Marine Supplies & Equipment, Shelton - Boat Supplies
- Marine Supplies & Equipment Repair, Shelton - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Shelton
- Marriage & Family Counselors, Shelton
- Martial Arts & Self Defense Schools, Shelton
- Masonry Materials & Supplies, Shelton
- Massage Therapists & Professional, Shelton
- Massage Therapy, Shelton
- Meat Cutting Services, Shelton
- Meat Market, Wholesale & Products, Shelton
- Medical & Dental Management, Shelton
- Medical Diagnostic Clinics, Shelton - Clinical Labs & Centers
- Medical Supplies & Equipment, Shelton
- Meeting & Event Planning Services, Shelton - Conference Consultants
- Membership Sports & Recreation Clubs, Shelton
- Mental Health Specialists, Shelton - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Shelton - Iron Works
- Mexican & Latin American Goods & Products Stores, Shelton
- Mexican Restaurants, Shelton
- Microwave Communications, Shelton
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- Mildew Removal & Control, Shelton - Mold Removal
- Millwork Contractors, Shelton
- Mineral Wool Manufacturers, Shelton
- Mini & Self Storage, Shelton
- Mirrors, Shelton - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Shelton
- Miscellaneous Retail Stores, Shelton
- Miscellaneous Agriculture, Shelton
- Miscellaneous Business Services, Shelton
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Shelton
- Miscellaneous Government, Shelton
- Miscellaneous Industry, Shelton
- Miscellaneous Manufacturing, Shelton
- Miscellaneous Personal Services, Shelton
- Miscellaneous Photographers, Shelton
- Miscellaneous Professional, Shelton
- Mobile Home Contractors, Shelton
- Mobile Home Improvements & Repairs, Shelton
- Mobile Home Parks & Communities , Shelton
- Modular & Mobile Homes For Sale, Shelton - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Shelton
- Mortgage Bankers & Correspondents, Shelton
- Mortgage Companies, Shelton
- Mortgage Contracts & Services, Shelton
- Motor Homes, Shelton
- Motor Vehicle, Shelton
- Motor Vehicle Rental & Leasing, Shelton
- Motorcycle Parts, Accessories & Dealers, Shelton
- Movie Theaters, Shelton
- Moving Companies, Shelton
- Moving Supplies & Equipment Rental, Shelton
- Moving Truck Rental , Shelton
- Muffler Shop & Exhaust Systems, Shelton
- Museums, Shelton
- Music, Shelton
- Musical Instruments & Equipment Stores, Shelton
- Musical Recording Services, Shelton
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