- Machine Shop, Duncan
- Machine Shop & Tool Repair Service, Duncan
- Machine Tools Manufacturers Metal Cutting Types, Duncan
- Machinery And Equipment Manufacturers, Duncan
- Machinery, Supplies & Equipment - Business Production Related, Duncan
- Machinery, Supplies & Equipment - Business Supplies Related, Duncan
- Machinery, Supplies & Equipment - Construction & Contractor Related, Duncan
- Mailing, Delivery & Courier Service, Duncan
- Major Appliances, Duncan - Household & Kitchen
- Malls & Shopping Centers, Duncan
- Management Consultants & Services, Duncan
- Manicurists & Pedicurists, Duncan
- Manufacturers Agents & Representatives, Duncan
- Manufacturers Representative, Duncan - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Duncan
- Manufacturing & Industrial Consultants, Duncan
- Manufacturing Products, Duncan
- Marine Supplies & Equipment, Duncan - Boat Supplies
- Market Research & Analysis , Duncan - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Duncan
- Martial Arts & Self Defense Schools, Duncan
- Masonry Materials & Supplies, Duncan
- Massage Therapists & Professional, Duncan
- Massage Therapy, Duncan
- Meat Market, Wholesale & Products, Duncan
- Medical Groups & Clinics, Duncan - Medical & Health Centers
- Medical Supplies & Equipment, Duncan
- Membership Sports & Recreation Clubs, Duncan
- Men's & Boys Clothing & Accessories Stores, Duncan
- Mens & Boys Jeans & Western Wear Stores, Duncan
- Mental Health Clinics, Duncan - Treatment Centers
- Mental Health Specialists, Duncan - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Duncan
- Merle Norman Cosmetics, Duncan
- Metal Plating & Polishing, Duncan
- Metal Working Machinery, Duncan
- Meters Repair, Duncan
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- Methodist Church, Duncan
- Mexican Food, Duncan
- Mexican Restaurants, Duncan
- Minerals, Duncan
- Mini & Self Storage, Duncan
- Mining, Duncan
- Ministries Church, Duncan
- Miscellaneous Agriculture, Duncan
- Miscellaneous Business Services, Duncan
- Miscellaneous Government, Duncan
- Miscellaneous Manufacturing, Duncan
- Miscellaneous Personal Services, Duncan
- Miscellaneous Professional, Duncan
- Mission Churches, Duncan
- Mobile Home Parks & Communities , Duncan
- Modular & Mobile Homes For Sale, Duncan - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Duncan
- Mortgage Bankers & Correspondents, Duncan
- Mortgage Companies, Duncan
- Mortgages & Loans, Duncan
- Motor Vehicle, Duncan
- Motor Vehicle Rental & Leasing, Duncan
- Motorcycle & ATV Repair & Service, Duncan
- Motorcycle & Motor Scooters Dealers, Repair & Service, Duncan
- Motorcycle Parts, Accessories & Dealers, Duncan
- Motorcycle Repair & Service, Duncan
- Movie Theaters, Duncan
- Moving Companies, Duncan
- Moving Supplies & Equipment Rental, Duncan
- Moving Truck Rental , Duncan
- Muffler Shop & Exhaust Systems, Duncan
- Museums, Duncan
- Music, Duncan
- Musical Instrument Rental, Duncan - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Duncan
- Musical Instruments - Guitars, Duncan
- Musical Instruments Repair, Sales & Service, Duncan
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