- Machinery, Supplies & Equipment - Construction & Contractor Related, Barnesville
- Manufacturing, Barnesville
- Manufacturing Products, Barnesville
- Marriage & Family Counselors, Barnesville
- Meat Market, Wholesale & Products, Barnesville
- Merchandise Sales Events, Barnesville
- Methodist Church, Barnesville
- Mining Consultants, Barnesville
- Miscellaneous Government, Barnesville
- Miscellaneous Photographers, Barnesville
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- Miscellaneous Professional, Barnesville
- Mortgage Bankers & Correspondents, Barnesville
- Motor Vehicle, Barnesville
- Motor Vehicle Rental & Leasing, Barnesville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Barnesville
- Motorcycle Repair & Service, Barnesville
- Moving Companies, Barnesville
- Moving Supplies & Equipment Rental, Barnesville
- Moving Truck Rental , Barnesville
- Museums, Barnesville
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