- Machine Shop & Tool Repair Service, Douglassville
- Machinery, Supplies & Equipment - Business Production Related, Douglassville
- Machinery, Supplies & Equipment - Business Supplies Related, Douglassville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Douglassville
- Mail Delivery Service, Douglassville
- Management Consultants & Services, Douglassville
- Manicurists & Pedicurists, Douglassville
- Manufacturing, Douglassville
- Manufacturing Products, Douglassville
- Marriage & Family Counselors, Douglassville
- Masonry Contractors, Douglassville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Douglassville
- Massage Therapists & Professional, Douglassville
- Massage Therapy, Douglassville
- Material Handling Equipment, Douglassville - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Douglassville
- Medical Supplies & Equipment, Douglassville
- Membership Sports & Recreation Clubs, Douglassville
- Merchandise Sales Events, Douglassville
- Metal Goods Alloys, Douglassville
- Methodist Church, Douglassville
- Mexican Restaurants, Douglassville
- Mini & Self Storage, Douglassville
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- Mining, Douglassville
- Miscellaneous Household Item Repair, Douglassville
- Miscellaneous Business Services, Douglassville
- Miscellaneous Industry, Douglassville
- Miscellaneous Manufacturing, Douglassville
- Miscellaneous Personal Services, Douglassville
- Miscellaneous Photographers, Douglassville
- Miscellaneous Professional, Douglassville
- Mobile Home Parks & Communities , Douglassville
- Motor Vehicle, Douglassville
- Motor Vehicle Rental & Leasing, Douglassville
- Motorcycle Parts, Accessories & Dealers, Douglassville
- Moving Companies, Douglassville
- Moving Supplies & Equipment Rental, Douglassville
- Moving Truck Rental , Douglassville
- Mulch, Peat & Moss Products, Douglassville
- Multimedia Publishers, Douglassville - Multimedia Services & Systems
- Music, Douglassville
- Musical Instrument Manufacturers, Douglassville
- Musical Instrument Rental, Douglassville - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Douglassville
- Musical Instruments Repair, Sales & Service, Douglassville
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