- Machine Shop & Tool Repair Service, Solomons
- Machinery, Supplies & Equipment - Business Production Related, Solomons
- Management Consultants & Services, Solomons
- Manicurists & Pedicurists, Solomons
- Manufacturing, Solomons
- Marinas & Marina Services, Solomons
- Marine Contractors & Designers, Solomons
- Marine Electronic Equipment, Solomons
- Marine Products And Services, Solomons
- Marine Repair & Service Stations, Solomons
- Marine Supplies & Equipment, Solomons - Boat Supplies
- Marine Supplies & Equipment Repair, Solomons - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Solomons
- Markets & Grocers Equipment, Solomons
- Marriage & Family Counselors, Solomons
- Massage Therapists & Professional, Solomons
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- Massage Therapy, Solomons
- Medical Supplies & Equipment, Solomons
- Membership Sports & Recreation Clubs, Solomons
- Mental Health Specialists, Solomons - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Solomons
- Mini & Self Storage, Solomons
- Miscellaneous Business Product Repair, Solomons
- Miscellaneous Personal Services, Solomons
- Miscellaneous Professional, Solomons
- Mortgage Bankers & Correspondents, Solomons
- Motor Vehicle, Solomons
- Motor Vehicle Rental & Leasing, Solomons
- Moving Companies, Solomons
- Moving Services - Labor & Material, Solomons
- Moving Truck Rental , Solomons
- Museums, Solomons
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