- Machine Shop & Tool Repair Service, Shelton
- Machine Tool Repair & Rebuild, Shelton
- Machine Tools , Shelton
- Machinery And Equipment Manufacturers, Shelton
- Machinery, Supplies & Equipment - Business Production Related, Shelton
- Machinery, Supplies & Equipment - Business Supplies Related, Shelton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Shelton
- Magicians & Hypnotist Entertainers, Shelton
- Mailbox Rental Services, Shelton
- Mailing, Delivery & Courier Service, Shelton
- Maintenance, Cleaning & Sanitation, Shelton
- Major Appliances, Shelton - Household & Kitchen
- Malls & Shopping Centers, Shelton
- Management Consultants & Services, Shelton
- Manicurists & Pedicurists, Shelton
- Manufacturing, Shelton
- Manufacturing Products, Shelton
- Manufacturing Services, Shelton
- Marinas & Marina Services, Shelton
- Marine Products And Services, Shelton
- Marine Services, Shelton
- Market Research & Analysis , Shelton - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Shelton
- Marriage & Family Counselors, Shelton
- Martial Arts & Self Defense Schools, Shelton
- Masonry Contractors, Shelton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Shelton
- Massage Therapy, Shelton
- Meat Market, Wholesale & Products, Shelton
- Mechanical Contractors, Shelton - Install, Service & Repair
- Mechanical Engineer, Shelton - Mechanical Engineering Service
- 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 Clinics, Shelton - Treatment Centers
- Mental Health Specialists, Shelton - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Shelton
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- Messenger Service, Shelton - Message Receiving & Forwarding Service
- Metal Plating & Polishing, Shelton
- Metal Stampings Manufacturers, Shelton
- Methodist Church, Shelton
- Mexican Restaurants, Shelton
- Microfilm & Imaging Service, Equipment & Supplies , Shelton
- Mildew Removal & Control, Shelton - Mold Removal
- Mini & Self Storage, Shelton
- Mini Golf Courses, Shelton
- Mirrors, Shelton - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Shelton
- Miscellaneous Business Services, Shelton
- Miscellaneous Government, Shelton
- Miscellaneous Metal Work Manufacturers, Shelton
- Miscellaneous Personal Services, Shelton
- Miscellaneous Photographers, Shelton
- Miscellaneous Professional, Shelton
- Mobile Home Parks & Communities , Shelton
- Monuments, Tombstones, Markers & Memorials, Shelton
- Mortgage Bankers & Correspondents, Shelton
- Mortgage Companies, Shelton
- Mortgages & Loans, Shelton
- Motion Picture & Television Production Services, Shelton
- Motion Picture Dists & Producers, Shelton
- Motion Pictures Video Tape Duplication & Transfer Services, Shelton
- Motor Vehicle, Shelton
- Motor Vehicle Rental & Leasing, Shelton
- Moving & Storage Supplies & Equipment, Shelton
- Moving Companies, Shelton
- Moving Supplies & Equipment Rental, Shelton
- Moving Truck Rental , Shelton
- Muffler Shop & Exhaust Systems, Shelton
- Music, Shelton
- Music Lessons, Shelton
- Music Lessons - Instrumental, Shelton
- Music Publishers & Distribution, Shelton
- Musical Instruments Repair, Sales & Service, Shelton
- Musical Recording Services, Shelton
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