- Machine Shop & Tool Repair Service, New London
- Machinery And Equipment Manufacturers, New London
- Machinery, Supplies & Equipment - Business Production Related, New London
- Machinery, Supplies & Equipment - Construction & Contractor Related, New London
- Management Consultants & Services, New London
- Manufacturers Agents & Representatives, New London
- Manufacturers Representative, New London - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, New London
- Marinas & Marina Services, New London
- Membership Sports & Recreation Clubs, New London
- Metal Buildings, New London - Kits, Homes, Steel Buildings, etc
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- Methodist Church, New London
- Miscellaneous Business Product Repair, New London
- Miscellaneous Government, New London
- Miscellaneous Industry, New London
- Miscellaneous Manufacturing, New London
- Miscellaneous Personal Services, New London
- Miscellaneous Professional, New London
- Motor Vehicle, New London
- Motor Vehicle Rental & Leasing, New London
- Motorcycle Parts, Accessories & Dealers, New London
- Moving Truck Rental , New London
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