- Machine Shop & Tool Repair Service, Campbellton
- Machinery, Supplies & Equipment - Business Production Related, Campbellton
- Machinery, Supplies & Equipment - Business Supplies Related, Campbellton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Campbellton
- Magazine & Newspaper Stands, Campbellton - Dealers & Distributors
- Major Appliances, Campbellton - Household & Kitchen
- Make Up & Cosmetics Application, Campbellton
- Malls & Shopping Centers, Campbellton
- Management Consultants & Services, Campbellton
- Manufacturing, Campbellton
- Manufacturing Products, Campbellton
- Marriage & Family Counselors, Campbellton
- Masonry Materials & Supplies, Campbellton
- Massage Therapists & Professional, Campbellton
- Massage Therapy, Campbellton
- Mastectomy Apparel, Forms, Prostheses & Supplies, Campbellton
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- Medical Supplies & Equipment, Campbellton
- Mental Health Specialists, Campbellton - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Campbellton - Kits, Homes, Steel Buildings, etc
- Miscellaneous Industry, Campbellton
- Miscellaneous Personal Services, Campbellton
- Miscellaneous Professional, Campbellton
- Money Transfer Service, Campbellton
- Monuments, Tombstones, Markers & Memorials, Campbellton
- Mortgage Bankers & Correspondents, Campbellton
- Mortgage Brokers, Campbellton
- Motor Vehicle, Campbellton
- Movie Theaters, Campbellton
- Moving Companies, Campbellton
- Music, Campbellton
- Musical Instruments & Equipment Stores, Campbellton
- Musical Instruments Repair, Sales & Service, Campbellton
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