- Machinery Movers & Erectors, Thomaston
- Machinery, Supplies & Equipment - Business Supplies Related, Thomaston
- Management Consultants & Services, Thomaston
- Manicurists & Pedicurists, Thomaston
- Manufacturing, Thomaston
- Manufacturing Equipment & Supplies, Thomaston
- Manufacturing Products, Thomaston
- Marine Contractors & Designers, Thomaston
- Marine Supplies & Equipment, Thomaston - Boat Supplies
- Masonry Materials & Supplies, Thomaston
- Methodist Church, Thomaston
- Miscellaneous Business Services, Thomaston
- Miscellaneous Government, Thomaston
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- Miscellaneous Professional, Thomaston
- Monuments, Tombstones, Markers & Memorials, Thomaston
- Motion Picture & Television Production Services, Thomaston
- Motion Picture Dists & Producers, Thomaston
- Motor Vehicle, Thomaston
- Motor Vehicle Rental & Leasing, Thomaston
- Motorcycle & Motor Scooters Dealers, Repair & Service, Thomaston
- Motorcycle Repair & Service, Thomaston
- Movie Theaters, Thomaston
- Moving Truck Rental , Thomaston
- Museums, Thomaston
- Music Entertainment, Thomaston
- Musicians, Bands & Disc Jockeys, Thomaston
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