- Major Appliances, Port Royal - Household & Kitchen
- Management Consultants & Services, Port Royal
- Manicurists & Pedicurists, Port Royal
- Manufacturing, Port Royal
- Marinas & Marina Services, Port Royal
- Marine Electronic Equipment, Port Royal
- Marine Supplies & Equipment, Port Royal - Boat Supplies
- Medical & Dental Management, Port Royal
- Mental Health Specialists, Port Royal - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Port Royal
- Mexican Restaurants, Port Royal
- Mini & Self Storage, Port Royal
- Miscellaneous Business Services, Port Royal
- Miscellaneous Government, Port Royal
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- Miscellaneous Photographers, Port Royal
- Miscellaneous Professional, Port Royal
- Mortgage Bankers & Correspondents, Port Royal
- Motor Vehicle, Port Royal
- Motor Vehicle Rental & Leasing, Port Royal
- Moving & Storage Supplies & Equipment, Port Royal
- Moving Companies, Port Royal
- Moving Truck Rental , Port Royal
- Museums, Port Royal
- Music, Port Royal
- Music Lessons, Port Royal
- Music Lessons - Instrumental, Port Royal
- Music Schools, Port Royal
- Musical Instruments & Equipment Stores, Port Royal
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