- Machine Shop, Trinidad
- Machine Shop & Tool Repair Service, Trinidad
- Machinery, Supplies & Equipment - Business Production Related, Trinidad
- Machinery, Supplies & Equipment - Business Supplies Related, Trinidad
- Machinery, Supplies & Equipment - Construction & Contractor Related, Trinidad
- Major Appliances, Trinidad - Household & Kitchen
- Management Consultants & Services, Trinidad
- Manicurists & Pedicurists, Trinidad
- Manufacturing, Trinidad
- Marriage & Family Counselors, Trinidad
- Masonry Contractors, Trinidad - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Trinidad
- Massage Therapy, Trinidad
- Meat Market, Wholesale & Products, Trinidad
- Medical & Dental Management, Trinidad
- Medical Groups & Clinics, Trinidad - Medical & Health Centers
- Medical Supplies & Equipment, Trinidad
- Mental Health Clinics, Trinidad - Treatment Centers
- Mental Health Specialists, Trinidad - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Trinidad
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- Mexican Restaurants, Trinidad
- Mining, Trinidad
- Miscellaneous Business Services, Trinidad
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Trinidad
- Miscellaneous Government, Trinidad
- Miscellaneous Industry, Trinidad
- Miscellaneous Personal Services, Trinidad
- Miscellaneous Professional, Trinidad
- Mobile Home Parks & Communities , Trinidad
- Monuments, Tombstones, Markers & Memorials, Trinidad
- Mortgage Bankers & Correspondents, Trinidad
- Mortgage Contracts & Services, Trinidad
- Motor Vehicle, Trinidad
- Motor Vehicle Rental & Leasing, Trinidad
- Motorcycle Parts, Accessories & Dealers, Trinidad
- Movie Theaters, Trinidad
- Moving Supplies & Equipment Rental, Trinidad
- Moving Truck Rental , Trinidad
- Muffler Shop & Exhaust Systems, Trinidad
- Museums, Trinidad
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