- Machine Shop & Tool Repair Service, Morrow
- Machinery, Supplies & Equipment - Business Supplies Related, Morrow
- Machinery, Supplies & Equipment - Construction & Contractor Related, Morrow
- Major Appliance Repair & Service, Morrow
- Manufacturers Agents & Representatives, Morrow
- Manufacturers Representative, Morrow - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Morrow
- Masonry Materials & Supplies, Morrow
- Merchandise Sales Events, Morrow
- Metal Repair Service & Blacksmith, Morrow - Iron Works
- Methodist Church, Morrow
- Mini & Self Storage, Morrow
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- Miscellaneous Government, Morrow
- Miscellaneous Manufacturing, Morrow
- Miscellaneous Personal Services, Morrow
- Miscellaneous Professional, Morrow
- Mobile Home Parks & Communities , Morrow
- Monuments, Tombstones, Markers & Memorials, Morrow
- Mortgage Bankers & Correspondents, Morrow
- Motor Vehicle, Morrow
- Motor Vehicle Rental & Leasing, Morrow
- Moving Supplies & Equipment Rental, Morrow
- Moving Truck Rental , Morrow
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