- Machine Shop & Tool Repair Service, Severn
- Machinery, Supplies & Equipment - Business Production Related, Severn
- Machinery, Supplies & Equipment - Business Supplies Related, Severn
- Machinery, Supplies & Equipment - Construction & Contractor Related, Severn
- Major Appliances, Severn - Household & Kitchen
- Management Consultants & Services, Severn
- Manicurists & Pedicurists, Severn
- Manufacturing, Severn
- Martial Arts & Self Defense Schools, Severn
- Masonry Materials & Supplies, Severn
- Mechanical Contractors, Severn - Install, Service & Repair
- Medical Billing Services, Severn
- Methodist Church, Severn
- Metropolitan Church, Severn
- Miscellaneous Household Item Repair, Severn
- Miscellaneous Government, Severn
- Miscellaneous Personal Services, Severn
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- Miscellaneous Professional, Severn
- Mobile Home Parks & Communities , Severn
- Modular & Mobile Homes For Sale, Severn - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Severn
- Mortgage Companies, Severn
- Mortgage Contracts & Services, Severn
- Mortgages & Loans, Severn
- Mortgages Commercial & Industrial, Severn
- Moth Proofing Services, Severn
- Motor Vehicle, Severn
- Motorcycle & Motor Scooters Dealers, Repair & Service, Severn
- Motorcycle Parts, Accessories & Dealers, Severn
- Motorcycle Repair & Service, Severn
- Moving Companies, Severn
- Muffler Shop & Exhaust Systems, Severn
- Mulch, Peat & Moss Products, Severn
- Multimedia Publishers, Severn - Multimedia Services & Systems
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