- Machine Shop & Tool Repair Service, Watford City
- Machinery, Supplies & Equipment - Business Production Related, Watford City
- Machinery, Supplies & Equipment - Business Supplies Related, Watford City
- Machinery, Supplies & Equipment - Construction & Contractor Related, Watford City
- Mail Delivery Service, Watford City
- Mailbox Rental Services, Watford City
- Management Consultants & Services, Watford City
- Manufacturing, Watford City
- Masonry Materials & Supplies, Watford City
- Medical Groups & Clinics, Watford City - Medical & Health Centers
- Membership Sports & Recreation Clubs, Watford City
- Mental Health Specialists, Watford City - Psychologist, Psychiatrist, Psychotherapist, etc
- Mexican Restaurants, Watford City
- Mining, Watford City
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- Ministries Church, Watford City
- Miscellaneous Agriculture, Watford City
- Miscellaneous Business Services, Watford City
- Miscellaneous Government, Watford City
- Miscellaneous Manufacturing, Watford City
- Miscellaneous Professional, Watford City
- Modular & Mobile Homes For Sale, Watford City - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Watford City
- Mortgage Bankers & Correspondents, Watford City
- Mortgage Contracts & Services, Watford City
- Motor Vehicle, Watford City
- Motor Vehicle Rental & Leasing, Watford City
- Moving Truck Rental , Watford City
- Museums, Watford City
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