- Machine Shop, Waterford
- Machine Shop & Tool Repair Service, Waterford
- Machine Shop Rotary Surface Grinding, Waterford - Tool Grinding & Sharpening
- Machinery And Equipment Manufacturers, Waterford
- Machinery, Supplies & Equipment - Business Production Related, Waterford
- Machinery, Supplies & Equipment - Business Supplies Related, Waterford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Waterford
- Management Consultants & Services, Waterford
- Manufacturing, Waterford
- Manufacturing Products, Waterford
- Masonry Contractors, Waterford - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Waterford
- Massage Therapists & Professional, Waterford
- Massage Therapy, Waterford
- Medical Diagnostic Clinics, Waterford - Clinical Labs & Centers
- Medical Groups & Clinics, Waterford - Medical & Health Centers
- Medical Supplies & Equipment, Waterford
- Meeting & Event Planning Services, Waterford - Conference Consultants
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- Membership Organizations, Waterford
- Mental Health Specialists, Waterford - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Waterford
- Mini & Self Storage, Waterford
- Miscellaneous Agriculture, Waterford
- Miscellaneous Government, Waterford
- Miscellaneous Industry, Waterford
- Miscellaneous Personal Services, Waterford
- Miscellaneous Professional, Waterford
- Mobile Home Parks & Communities , Waterford
- Motor Vehicle, Waterford
- Motor Vehicle Rental & Leasing, Waterford
- Motorcycle & ATV Repair & Service, Waterford
- Motorcycle & Motor Scooters Dealers, Repair & Service, Waterford
- Motorcycle Repair & Service, Waterford
- Movie Theaters, Waterford
- Moving Truck Rental , Waterford
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