- Machinery, Supplies & Equipment - Business Production Related, Wallingford
- Management Consultants & Services, Wallingford
- Manufacturing, Wallingford
- Manufacturing Products, Wallingford
- Masonry Contractors, Wallingford - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Wallingford
- Massage Therapists & Professional, Wallingford
- Massage Therapy, Wallingford
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- Meat Market, Wholesale & Products, Wallingford
- Meeting & Event Planning Services, Wallingford - Conference Consultants
- Mental Health Specialists, Wallingford - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Wallingford
- Metal Repair Service & Blacksmith, Wallingford - Iron Works
- Miscellaneous Government, Wallingford
- Motor Vehicle, Wallingford
- Motorcycle Parts, Accessories & Dealers, Wallingford
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