- Machine Shop & Tool Repair Service, Greenwich
- Machinery, Supplies & Equipment - Business Production Related, Greenwich
- Major Appliances, Greenwich - Household & Kitchen
- Manufacturers Agents & Representatives, Greenwich
- Manufacturers Representative, Greenwich - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Greenwich
- Martial Arts & Self Defense Schools, Greenwich
- Masonry Materials & Supplies, Greenwich
- Massage Therapists & Professional, Greenwich
- Massage Therapy, Greenwich
- Meat Market, Wholesale & Products, Greenwich
- Medical Groups & Clinics, Greenwich - Medical & Health Centers
- Medical Supplies & Equipment, Greenwich
|
- Methodist Church, Greenwich
- Mini & Self Storage, Greenwich
- Miscellaneous Agriculture, Greenwich
- Miscellaneous Government, Greenwich
- Miscellaneous Manufacturing, Greenwich
- Miscellaneous Personal Services, Greenwich
- Mobile Home Parks & Communities , Greenwich
- Motor Vehicle, Greenwich
- Motor Vehicle Rental & Leasing, Greenwich
- Motorcycle & Motor Scooters Dealers, Repair & Service, Greenwich
- Motorcycle Parts, Accessories & Dealers, Greenwich
- Motorcycle Repair & Service, Greenwich
- Moving Truck Rental , Greenwich
|