- Machinery, Supplies & Equipment - Business Supplies Related, Crownsville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Crownsville
- Maintenance, Cleaning & Sanitation, Crownsville
- Major Appliance Repair & Service, Crownsville
- Major Appliances, Crownsville - Household & Kitchen
- Management Consultants & Services, Crownsville
- Manicurists & Pedicurists, Crownsville
- Manufacturing, Crownsville
- Marinas & Marina Services, Crownsville
- Marine Contractors & Designers, Crownsville
- Marine Supplies & Equipment, Crownsville - Boat Supplies
- Marriage & Family Counselors, Crownsville
- Mechanical Engineer, Crownsville - Mechanical Engineering Service
- Mental Health Clinics, Crownsville - Treatment Centers
- Mental Health Specialists, Crownsville - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Crownsville
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- Mildew Removal & Control, Crownsville - Mold Removal
- Mining, Crownsville
- Miscellaneous Household Item Repair, Crownsville
- Miscellaneous Business Services, Crownsville
- Miscellaneous Government, Crownsville
- Miscellaneous Industry, Crownsville
- Miscellaneous Personal Services, Crownsville
- Mobile Home Contractors, Crownsville
- Mobile Home Improvements & Repairs, Crownsville
- Mobile Home Parks & Communities , Crownsville
- Modular & Mobile Homes For Sale, Crownsville - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Crownsville
- Mortgage Contracts & Services, Crownsville
- Motor Vehicle, Crownsville
- Music Entertainment, Crownsville
- Musicians, Bands & Disc Jockeys, Crownsville
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