- Machine Shop & Tool Repair Service, Duncan
- Machinery Movers & Erectors, 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
- Magazine & Newspaper Stands, Duncan - Dealers & Distributors
- Mailing, Delivery & Courier Service, Duncan
- Maintenance, Cleaning & Sanitation, Duncan
- Major Appliances, Duncan - Household & Kitchen
- Malls & Shopping Centers, Duncan
- Management Consultants & Services, Duncan
- Manicurists & Pedicurists, Duncan
- Manufacturing, Duncan
- Manufacturing Products, Duncan
- Marble, Duncan
- Marinas & Marina Services, Duncan
- Marine Products And Services, Duncan
- Marine Repair & Service Stations, Duncan
- Marine Supplies & Equipment, Duncan - Boat Supplies
- Marine Supplies & Equipment Repair, Duncan - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Duncan
- Marriage & Family Counselors, Duncan
- Martial Arts & Self Defense Schools, Duncan
- Masonry Contractors, Duncan - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Duncan
- Massage Therapists & Professional, Duncan
- Massage Therapy, Duncan
- Meat Market, Wholesale & Products, Duncan
- Mechanical Contractors, Duncan - Install, Service & Repair
- Medical Alert Systems, Duncan - Medical Alarms - PERS
- Medical Supplies & Equipment, Duncan
- Membership Sports & Recreation Clubs, Duncan
- Men's & Boys Clothing & Accessories Stores, Duncan
- Men's Clothing Stores, Duncan - Clothes & Accessories
- Mens & Boys Jeans & Western Wear Stores, Duncan
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- Mental Health Specialists, Duncan - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Duncan
- Midwives, Duncan
- Mildew Removal & Control, Duncan - Mold Removal
- Mini & Self Storage, Duncan
- Mining Equipment & Supplies, Duncan
- Mirrors, Duncan - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Duncan
- Miscellaneous Household Item Repair, Duncan
- Miscellaneous Agriculture, Duncan
- Miscellaneous Business Services, Duncan
- Miscellaneous Manufacturing, Duncan
- Miscellaneous Personal Services, Duncan
- Miscellaneous Photographers, Duncan
- Miscellaneous Professional, Duncan
- Moldings Materials, Duncan
- Money Transfer Service, Duncan
- Mortgage Bankers & Correspondents, Duncan
- Motion Picture & Television Production Services, Duncan
- Motor Vehicle, Duncan
- Motor Vehicle Rental & Leasing, Duncan
- Motorcycle & ATV Repair & Service, Duncan
- Motorcycle Parts, Accessories & Dealers, Duncan
- Motorcycle Repair & Service, Duncan
- Movie Theaters, Duncan
- Moving & Storage Supplies & Equipment, Duncan
- Moving Companies, Duncan
- Moving Truck Rental , Duncan
- Muffler Shop & Exhaust Systems, Duncan
- Museums, Duncan
- Music, Duncan
- Music Entertainment, Duncan
- Musical Instruments & Equipment Stores, Duncan
- Musical Recording Services, Duncan
- Musicians, Bands & Disc Jockeys, Duncan
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