- Machine Shop, Trinity
- Machine Shop & Tool Repair Service, Trinity
- Machinery And Equipment Manufacturers, Trinity
- Machinery, Supplies & Equipment - Business Production Related, Trinity
- Machinery, Supplies & Equipment - Business Supplies Related, Trinity
- Machinery, Supplies & Equipment - Construction & Contractor Related, Trinity
- Mail Delivery Service, Trinity
- Management Consultants & Services, Trinity
- Manicurists & Pedicurists, Trinity
- Manufactured & Mobile Home Movers & Transporting, Trinity
- Manufacturing, Trinity
- Manufacturing & Industrial Consultants, Trinity
- Manufacturing Products, Trinity
- Marinas & Marina Services, Trinity
- Marriage & Family Counselors, Trinity
- Meat Market, Wholesale & Products, Trinity
- Medical & Health Service Organizations, Trinity
- Medical Supplies & Equipment, Trinity
- Membership Sports & Recreation Clubs, Trinity
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- Mental Health Specialists, Trinity - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Trinity
- Mexican Restaurants, Trinity
- Mini & Self Storage, Trinity
- Mining, Trinity
- Miscellaneous Agriculture, Trinity
- Miscellaneous Government, Trinity
- Miscellaneous Personal Services, Trinity
- Miscellaneous Photographers, Trinity
- Mission Churches, Trinity
- Modular & Mobile Homes For Sale, Trinity - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Trinity
- Motor Vehicle, Trinity
- Motor Vehicle Rental & Leasing, Trinity
- Motorcycle Parts, Accessories & Dealers, Trinity
- Moving Companies, Trinity
- Moving Supplies & Equipment Rental, Trinity
- Moving Truck Rental , Trinity
- Muffler Shop & Exhaust Systems, Trinity
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