- Machinery, Supplies & Equipment - Business Supplies Related, Sparrows Point
- Machinery, Supplies & Equipment - Construction & Contractor Related, Sparrows Point
- Maintenance, Cleaning & Sanitation, Sparrows Point
- Manufacturers Agents & Representatives, Sparrows Point
- Manufacturers Representative, Sparrows Point - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Sparrows Point
- Manufacturing Products, Sparrows Point
- Marinas & Marina Services, Sparrows Point
- Marine Contractors & Designers, Sparrows Point
- Marine Products And Services, Sparrows Point
- Marine Repair & Service Stations, Sparrows Point
- Marine Supplies & Equipment Repair, Sparrows Point - Boat Supplies & Equipment
- Meat Market, Wholesale & Products, Sparrows Point
- Membership Sports & Recreation Clubs, Sparrows Point
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- Metal Finishers, Sparrows Point
- Metal Plating & Polishing, Sparrows Point
- Methodist Church, Sparrows Point
- Mildew Removal & Control, Sparrows Point - Mold Removal
- Millwrights, Sparrows Point
- Miscellaneous Government, Sparrows Point
- Miscellaneous Manufacturing, Sparrows Point
- Miscellaneous Professional, Sparrows Point
- Mortgage Bankers & Correspondents, Sparrows Point
- Mortgages & Loans, Sparrows Point
- Motor Vehicle, Sparrows Point
- Motor Vehicle Rental & Leasing, Sparrows Point
- Moving Truck Rental , Sparrows Point
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