- Machine Shop, Wallingford
- Machine Shop & Tool Repair Service, Wallingford
- Machine Tools , Wallingford
- Machinery And Equipment Manufacturers, Wallingford
- Machinery Repair & Rebuild, Wallingford
- Machinery, Supplies & Equipment - Business Production Related, Wallingford
- Machinery, Supplies & Equipment - Business Supplies Related, Wallingford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Wallingford
- Mailbox Rental Services, Wallingford
- Mailing List Service, Brokers & Compilers, Wallingford
- Mailing, Delivery & Courier Service, Wallingford
- Major Appliances, Wallingford - Household & Kitchen
- Malls & Shopping Centers, Wallingford
- Management Consultants & Services, Wallingford
- Manicurists & Pedicurists, Wallingford
- Manufacturers Agents & Representatives, Wallingford
- Manufacturers Representative, Wallingford - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Wallingford
- Manufacturing Equipment & Supplies, Wallingford
- Manufacturing Products, Wallingford
- Manufacturing Services, Wallingford
- Marble, Wallingford
- Market Research & Analysis , Wallingford - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Wallingford
- Martial Arts & Self Defense Schools, Wallingford
- Masonry Contractors, Wallingford - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Wallingford
- Masonry Panels Prefabricated, Wallingford
- Massage Therapists & Professional, Wallingford
- Massage Therapy, Wallingford
- Material Handling & Heavy Machinery & Equipment, Wallingford
- Measuring Equipment, Wallingford
- Meat Market, Wholesale & Products, Wallingford
- Mechanical Contractors, Wallingford - Install, Service & Repair
- Mechanical Engineer, Wallingford - Mechanical Engineering Service
- Medical & Dental Management, Wallingford
- Medical & Health Service Organizations, Wallingford
- Medical Billing Services, Wallingford
- Medical Diagnostic Clinics, Wallingford - Clinical Labs & Centers
- Medical Groups & Clinics, Wallingford - Medical & Health Centers
- Medical Records Service , Wallingford
- Medical Supplies & Equipment, Wallingford
- Meeting & Event Planning Services, Wallingford - Conference Consultants
- Membership Sports & Recreation Clubs, Wallingford
- Mental Health Specialists, Wallingford - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Wallingford
- Merchandising & Marketing Consultants, Wallingford
- Metal Distributors, Wallingford
- Metal Finishers, Wallingford
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- Metal Plating & Polishing, Wallingford
- Metal Repair Service & Blacksmith, Wallingford - Iron Works
- Metal Specialties, Wallingford
- Metal Spinning Manufacturers, Wallingford
- Methodist Church, Wallingford
- Mexican Restaurants, Wallingford
- Microfilm & Imaging Service, Equipment & Supplies , Wallingford
- Midwives, Wallingford
- Millwork Contractors, Wallingford
- Minerals, Wallingford
- Mini & Self Storage, Wallingford
- Mining, Wallingford
- Mirrors, Wallingford - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Wallingford
- Miscellaneous Agriculture, Wallingford
- Miscellaneous Business Services, Wallingford
- Miscellaneous Government, Wallingford
- Miscellaneous Industry, Wallingford
- Miscellaneous Manufacturing, Wallingford
- Miscellaneous Metal Work Manufacturers, Wallingford
- Miscellaneous Personal Services, Wallingford
- Miscellaneous Photographers, Wallingford
- Miscellaneous Professional, Wallingford
- Mobile Home Parks & Communities , Wallingford
- Money Transfer Service, Wallingford
- Monuments, Tombstones, Markers & Memorials, Wallingford
- Mortgage Bankers & Correspondents, Wallingford
- Mortgages & Loans, Wallingford
- Motion Picture & Television Production Services, Wallingford
- Motor Vehicle, Wallingford
- Motor Vehicle Rental & Leasing, Wallingford
- Motorcycle & Motor Scooters Dealers, Repair & Service, Wallingford
- Motorcycle Parts, Accessories & Dealers, Wallingford
- Motorcycle Repair & Service, Wallingford
- Mountain & Rock Climbing Equipment, Wallingford
- Movie Theaters, Wallingford
- Moving & Storage Supplies & Equipment, Wallingford
- Moving Companies, Wallingford
- Moving Supplies & Equipment Rental, Wallingford
- Moving Truck Rental , Wallingford
- Muffler Shop & Exhaust Systems, Wallingford
- Mulch, Peat & Moss Products, Wallingford
- Multimedia Publishers, Wallingford - Multimedia Services & Systems
- Museums, Wallingford
- Music, Wallingford
- Musical Instrument Rental, Wallingford - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Wallingford
- Musical Instruments Repair, Sales & Service, Wallingford
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