- Mailbox Rental Services, Trinity
- Mailing, Delivery & Courier Service, Trinity
- Major Appliances, Trinity - Household & Kitchen
- Management Consultants & Services, Trinity
- Manicurists & Pedicurists, Trinity
- Manufacturing, Trinity
- Manufacturing Products, Trinity
- Medical & Health Service Organizations, Trinity
- Medical Equipment Manufacturers, Trinity
- Medical Research, Trinity
- Medical Research & Development, Trinity - Medical Information & Research
- Medical Supplies & Equipment, Trinity
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- Methodist Church, Trinity
- Miscellaneous Government, Trinity
- Miscellaneous Personal Services, Trinity
- Miscellaneous Photographers, Trinity
- Miscellaneous Professional, Trinity
- Mortgage Bankers & Correspondents, Trinity
- Mortgages & Loans, Trinity
- Motor Vehicle, Trinity
- Motor Vehicle Rental & Leasing, Trinity
- Moving & Storage Supplies & Equipment, Trinity
- Moving Companies, Trinity
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