- Machinery Movers & Erectors, Pottsboro
- Machinery, Supplies & Equipment - Business Supplies Related, Pottsboro
- Management Consultants & Services, Pottsboro
- Manufacturing, Pottsboro
- Marble, Pottsboro
- Marinas & Marina Services, Pottsboro
- Marine Contractors & Designers, Pottsboro
- Marine Products And Services, Pottsboro
- Marine Repair & Service Stations, Pottsboro
- Marine Supplies & Equipment, Pottsboro - Boat Supplies
- Marine Supplies & Equipment Repair, Pottsboro - Boat Supplies & Equipment
- Masonry Materials & Supplies, Pottsboro
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- Medical Research, Pottsboro
- Medical Research & Development, Pottsboro - Medical Information & Research
- Methodist Church, Pottsboro
- Miscellaneous Government, Pottsboro
- Miscellaneous Personal Services, Pottsboro
- Miscellaneous Photographers, Pottsboro
- Miscellaneous Professional, Pottsboro
- Mortgage Bankers & Correspondents, Pottsboro
- Motor Vehicle, Pottsboro
- Motor Vehicle Rental & Leasing, Pottsboro
- Moving Companies, Pottsboro
- Moving Truck Rental , Pottsboro
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