- Machine Shop & Tool Repair Service, Rockport
- Machinery Repair & Rebuild, Rockport
- Machinery, Supplies & Equipment - Construction & Contractor Related, Rockport
- Major Appliances, Rockport - Household & Kitchen
- Management Consultants & Services, Rockport
- Manicurists & Pedicurists, Rockport
- Manufacturing, Rockport
- Marine Products And Services, Rockport
- Marine Services, Rockport
- Marriage & Family Counselors, Rockport
- Masonry Contractors, Rockport - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Rockport
- Massage Therapy, Rockport
- Membership Sports & Recreation Clubs, Rockport
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- Mental Health Specialists, Rockport - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Specialties, Rockport
- Metaphysical Churches, Rockport
- Methodist Church, Rockport
- Miscellaneous Business Product Repair, Rockport
- Miscellaneous Household Item Repair, Rockport
- Miscellaneous Photographers, Rockport
- Miscellaneous Professional, Rockport
- Mortgage Bankers & Correspondents, Rockport
- Motor Vehicle, Rockport
- Movie Theaters, Rockport
- Museums, Rockport
- Musical Instruments Repair, Sales & Service, Rockport
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