- Machine Shop, Williston
- Machine Shop & Tool Repair Service, Williston
- Machine Shops Experimental, Williston
- Machinery And Equipment Manufacturers, Williston
- Machinery Movers & Erectors, Williston
- Machinery, Supplies & Equipment - Business Production Related, Williston
- Machinery, Supplies & Equipment - Business Supplies Related, Williston
- Machinery, Supplies & Equipment - Construction & Contractor Related, Williston
- Mailbox Rental Services, Williston
- Mailing, Delivery & Courier Service, Williston
- Maintenance, Cleaning & Sanitation, Williston
- Major Appliances, Williston - Household & Kitchen
- Malls & Shopping Centers, Williston
- Management Consultants & Services, Williston
- Manicurists & Pedicurists, Williston
- Manifold Business Forms Manufacturers, Williston
- Manufacturing, Williston
- Marine Supplies & Equipment, Williston - Boat Supplies
- Marriage & Family Counselors, Williston
- Masonry Contractors, Williston - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Williston
- Massage Therapists & Professional, Williston
- Massage Therapy, Williston
- Material Handling & Heavy Machinery & Equipment, Williston
- Mats & Matting, Williston
- Meat Market, Wholesale & Products, Williston
- Meat Packers, Williston
- Mechanical Engineer, Williston - Mechanical Engineering Service
- Medical & Dental Management, Williston
- Medical Groups & Clinics, Williston - Medical & Health Centers
- Medical Supplies & Equipment, Williston
- Membership Sports & Recreation Clubs, Williston
- Men's Clothing Stores, Williston - Clothes & Accessories
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- Mental Health Specialists, Williston - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Williston
- Metal Specialties, Williston
- Mexican Restaurants, Williston
- Mildew Removal & Control, Williston - Mold Removal
- Mini & Self Storage, Williston
- Mining, Williston
- Mirrors, Williston - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Williston
- Miscellaneous Business Services, Williston
- Miscellaneous Government, Williston
- Miscellaneous Industry, Williston
- Miscellaneous Manufacturing, Williston
- Miscellaneous Personal Services, Williston
- Miscellaneous Photographers, Williston
- Miscellaneous Professional, Williston
- Modular & Mobile Homes For Sale, Williston - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Williston
- Motion Picture & Television Production Services, Williston
- Motion Picture Dists & Producers, Williston
- Motion Picture Pre & Post Production Services, Williston
- Motion Pictures Video Tape Duplication & Transfer Services, Williston
- Motor Vehicle, Williston
- Motor Vehicle Rental & Leasing, Williston
- Motorcycle Parts, Accessories & Dealers, Williston
- Movie Theaters, Williston
- Moving & Storage Consultants, Williston
- Moving & Storage Supplies & Equipment, Williston
- Moving Companies, Williston
- Moving Truck Rental , Williston
- Music, Williston
- Music Background Leased, Williston
- Musical Instruments & Equipment Stores, Williston
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