- Machinery Movers & Erectors, Uncasville
- Machinery, Supplies & Equipment - Business Production Related, Uncasville
- Machinery, Supplies & Equipment - Business Supplies Related, Uncasville
- Manicurists & Pedicurists, Uncasville
- Manufacturing, Uncasville
- Manufacturing & Industrial Consultants, Uncasville
- Marinas & Marina Services, Uncasville
- Marine Products And Services, Uncasville
- Marine Repair & Service Stations, Uncasville
- Marine Supplies & Equipment, Uncasville - Boat Supplies
- Marine Supplies & Equipment Repair, Uncasville - Boat Supplies & Equipment
- Material Handling & Heavy Machinery & Equipment, Uncasville
- Mexican Restaurants, Uncasville
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- Mini & Self Storage, Uncasville
- Miscellaneous Government, Uncasville
- Miscellaneous Industry, Uncasville
- Miscellaneous Personal Services, Uncasville
- Miscellaneous Photographers, Uncasville
- Miscellaneous Professional, Uncasville
- Motor Homes, Uncasville
- Motor Vehicle, Uncasville
- Motor Vehicle Rental & Leasing, Uncasville
- Moving Truck Rental , Uncasville
- Music, Uncasville
- Musical Instruments & Equipment Stores, Uncasville
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