- Machine Shop & Tool Repair Service, Mannford
- Machinery, Supplies & Equipment - Business Production Related, Mannford
- Machinery, Supplies & Equipment - Business Supplies Related, Mannford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Mannford
- Major Appliances, Mannford - Household & Kitchen
- Management Consultants & Services, Mannford
- Manicurists & Pedicurists, Mannford
- Manufacturing, Mannford
- Manufacturing Products, Mannford
- Marinas & Marina Services, Mannford
- Masonry Materials & Supplies, Mannford
- Medical & Dental Management, Mannford
- Medical Supplies & Equipment, Mannford
- Membership Sports & Recreation Clubs, Mannford
- Merchandise Sales Events, Mannford
- Messenger Service, Mannford - Message Receiving & Forwarding Service
- Metal Plating & Polishing, Mannford
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- Methodist Church, Mannford
- Mexican Restaurants, Mannford
- Mini & Self Storage, Mannford
- Mining, Mannford
- Ministries Church, Mannford
- Miscellaneous Government, Mannford
- Miscellaneous Manufacturing, Mannford
- Miscellaneous Personal Services, Mannford
- Miscellaneous Photographers, Mannford
- Miscellaneous Professional, Mannford
- Mobile Home Parks & Communities , Mannford
- Money Transfer Service, Mannford
- Monuments, Tombstones, Markers & Memorials, Mannford
- Motor Vehicle, Mannford
- Motor Vehicle Rental & Leasing, Mannford
- Moving Truck Rental , Mannford
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