- Machine Shop, Mandan
- Machine Shop & Tool Repair Service, Mandan
- Machinery, Supplies & Equipment - Business Production Related, Mandan
- Machinery, Supplies & Equipment - Business Supplies Related, Mandan
- Machinery, Supplies & Equipment - Construction & Contractor Related, Mandan
- Magazine & Newspaper Stands, Mandan - Dealers & Distributors
- Mailing, Delivery & Courier Service, Mandan
- Major Appliances, Mandan - Household & Kitchen
- Management Consultants & Services, Mandan
- Manicurists & Pedicurists, Mandan
- Manufacturers Agents & Representatives, Mandan
- Manufacturers Representative, Mandan - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Mandan
- Manufacturing Products, Mandan
- Marinas & Marina Services, Mandan
- Marine Supplies & Equipment, Mandan - Boat Supplies
- Marine Surveyors & Adjustors, Mandan
- Martial Arts & Self Defense Schools, Mandan
- Masonry Contractors, Mandan - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Mandan
- Massage Therapists & Professional, Mandan
- Massage Therapy, Mandan
- Mazda Dealers, Mandan
- Meat Market, Wholesale & Products, Mandan
- Mechanical Contractors, Mandan - Install, Service & Repair
- Medical Diagnostic Clinics, Mandan - Clinical Labs & Centers
- Medical Supplies & Equipment, Mandan
- Membership Sports & Recreation Clubs, Mandan
- Men's & Boys Clothing & Accessories Stores, Mandan
- Men's Clothing Stores, Mandan - Clothes & Accessories
- Mens & Boys Jeans & Western Wear Stores, Mandan
- Mental Health Specialists, Mandan - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Mandan
- Metal Buildings, Mandan - Wood Buildings
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- Metal Repair Service & Blacksmith, Mandan - Iron Works
- Metal Services, Mandan
- Metal Tanks, Mandan
- Methodist Church, Mandan
- Mexican Restaurants, Mandan
- Millwork Contractors, Mandan
- Miscellaneous Business Product Repair, Mandan
- Miscellaneous Agriculture, Mandan
- Miscellaneous Government, Mandan
- Miscellaneous Industry, Mandan
- Miscellaneous Manufacturing, Mandan
- Miscellaneous Personal Services, Mandan
- Miscellaneous Photographers, Mandan
- Miscellaneous Professional, Mandan
- Mobile Home Contractors, Mandan
- Mobile Home Improvements & Repairs, Mandan
- Mobile Home Parks & Communities , Mandan
- Modeling & Talent Agencies, Mandan
- Modular & Mobile Homes For Sale, Mandan - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Mandan
- Mortgage Bankers & Correspondents, Mandan
- Mortgage Contracts & Services, Mandan
- Mortgages & Loans, Mandan
- Motor Vehicle, Mandan
- Motor Vehicle Rental & Leasing, Mandan
- Motorcycle & ATV Repair & Service, Mandan
- Motorcycle & Motor Scooters Dealers, Repair & Service, Mandan
- Motorcycle Parts, Accessories & Dealers, Mandan
- Motorcycle Repair & Service, Mandan
- Motorcycles Paint & Refinishing, Mandan
- Moving Companies, Mandan
- Moving Supplies & Equipment Rental, Mandan
- Moving Truck Rental , Mandan
- Museums, Mandan
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