- Machinery, Supplies & Equipment - Business Production Related, Rockport
- Magazine & Newspaper Stands, Rockport - Dealers & Distributors
- Management Consultants & Services, Rockport
- Manicurists & Pedicurists, Rockport
- Manufacturing, Rockport
- Manufacturing Products, Rockport
- Marine Supplies & Equipment, Rockport - Boat Supplies
- Marriage & Family Counselors, Rockport
- Masonry Contractors, Rockport - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Rockport
- Mechanical Contractors, Rockport - Install, Service & Repair
- Medical Supplies & Equipment, Rockport
- Membership Sports & Recreation Clubs, Rockport
- Mental Health Specialists, Rockport - Psychologist, Psychiatrist, Psychotherapist, etc
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- Midwives, Rockport
- Mini Golf Courses, Rockport
- Ministries Church, Rockport
- Miscellaneous Household Item Repair, Rockport
- Miscellaneous Government, Rockport
- Miscellaneous Personal Services, Rockport
- Miscellaneous Professional, Rockport
- Mobile Homes for Rent & Lease, Rockport
- Motion Picture Pre & Post Production Services, Rockport
- Motor Vehicle, Rockport
- Motor Vehicle Rental & Leasing, Rockport
- Moving Truck Rental , Rockport
- Muffler Shop & Exhaust Systems, Rockport
- Museums, Rockport
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