- Machine Shop, Duncan
- Machine Shop & Tool Repair Service, Duncan
- Machine Tools , Duncan
- Machine Tools Manufacturers Metal Cutting Types, Duncan
- Machinery And Equipment Manufacturers, Duncan
- Machinery Repair & Rebuild, Duncan
- Machinery, Supplies & Equipment - Business Production Related, Duncan
- Machinery, Supplies & Equipment - Business Supplies Related, Duncan
- Machinery, Supplies & Equipment - Construction & Contractor Related, Duncan
- Mailbox Rental Services, Duncan
- Mailing, Delivery & Courier Service, Duncan
- Major Appliances, Duncan - Household & Kitchen
- Management Consultants & Services, Duncan
- Manicurists & Pedicurists, Duncan
- Manufacturing, Duncan
- Manufacturing Equipment & Supplies, Duncan
- Manufacturing Products, Duncan
- Marriage & Family Counselors, Duncan
- Masonry Contractors, Duncan - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Duncan
- Material Handling, Duncan
- Material Handling Equipment, Duncan - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Duncan
- Medical Supplies & Equipment, Duncan
- Membership Sports & Recreation Clubs, Duncan
- Merchandise Sales Events, Duncan
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- Metal Cleaning & Pickling, Duncan
- Metal Finishers, Duncan
- Metal Finishing Equipment & Supplies, Duncan
- Metal Plating & Polishing, Duncan
- Metal Products, Duncan
- Metal Specialties, Duncan
- Metal Working Machinery, Duncan
- Methodist Church, Duncan
- Mexican Restaurants, Duncan
- Mini & Self Storage, Duncan
- Miscellaneous Business Product Repair, Duncan
- Miscellaneous Government, Duncan
- Miscellaneous Personal Services, Duncan
- Miscellaneous Professional, Duncan
- Modular & Mobile Homes For Sale, Duncan - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Duncan
- Mortgages & Loans, Duncan
- Motor Vehicle, Duncan
- Motor Vehicle Rental & Leasing, Duncan
- Movie Theaters, Duncan
- Moving & Storage Supplies & Equipment, Duncan
- Moving Companies, Duncan
- Moving Services - Labor & Material, Duncan
- Moving Supplies & Equipment Rental, Duncan
- Moving Truck Rental , Duncan
- Muffler Shop & Exhaust Systems, Duncan
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