- Machine Shop & Tool Repair Service, Belfast
- Machinery, Supplies & Equipment - Business Production Related, Belfast
- Maintenance, Cleaning & Sanitation, Belfast
- Major Appliances, Belfast - Household & Kitchen
- Management Consultants & Services, Belfast
- Manicurists & Pedicurists, Belfast
- Manufacturers Agents & Representatives, Belfast
- Manufacturers Representative, Belfast - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Belfast
- Manufacturing & Industrial Consultants, Belfast
- Marketing Consultants Professional Practices, Belfast
- Marriage & Family Counselors, Belfast
- Masonry Contractors, Belfast - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Belfast
- Massage Therapists & Professional, Belfast
- Massage Therapy, Belfast
- Medical Billing Services, Belfast
- Medical Supplies & Equipment, Belfast
- Mental Health Specialists, Belfast - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Belfast
- Metaphysical Churches, Belfast
- Methodist Church, Belfast
- Micro Breweries, Belfast
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- Midwives, Belfast
- Mildew Removal & Control, Belfast - Mold Removal
- Military Supplies, Belfast
- Millwork Contractors, Belfast
- Miscellaneous Household Item Repair, Belfast
- Miscellaneous Government, Belfast
- Miscellaneous Manufacturing, Belfast
- Miscellaneous Personal Services, Belfast
- Miscellaneous Professional, Belfast
- Modular & Mobile Homes For Sale, Belfast - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Belfast
- Mortgage Companies, Belfast
- Motion Picture & Television Production Services, Belfast
- Motion Picture Dists & Producers, Belfast
- Motor Vehicle, Belfast
- Motor Vehicle Rental & Leasing, Belfast
- Movie Theaters, Belfast
- Moving Companies, Belfast
- Moving Truck Rental , Belfast
- Muffler Shop & Exhaust Systems, Belfast
- Museums, Belfast
- Music, Belfast
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