- Machine Shop & Tool Repair Service, Joppa
- Machinery, Supplies & Equipment - Business Production Related, Joppa
- Machinery, Supplies & Equipment - Business Supplies Related, Joppa
- Machinery, Supplies & Equipment - Construction & Contractor Related, Joppa
- Major Appliances, Joppa - Household & Kitchen
- Management Consultants & Services, Joppa
- Manicurists & Pedicurists, Joppa
- Manufacturing, Joppa
- Manufacturing Products, Joppa
- Marinas & Marina Services, Joppa
- Masonry Contractors, Joppa - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Joppa
- Meat Market, Wholesale & Products, Joppa
- Mechanical Contractors, Joppa - Install, Service & Repair
- Medical & Dental Management, Joppa
- Medical & Health Service Organizations, Joppa
- Medical Management & Business Administration Service, Joppa
- Medical Supplies & Equipment, Joppa
- Membership Sports & Recreation Clubs, Joppa
- Men's & Boys Clothing & Accessories Stores, Joppa
- Mens & Boys Jeans & Western Wear Stores, Joppa
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- Mental Health Specialists, Joppa - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Joppa
- Metal Repair Service & Blacksmith, Joppa - Iron Works
- Methodist Church, Joppa
- Miscellaneous Government, Joppa
- Miscellaneous Industry, Joppa
- Miscellaneous Personal Services, Joppa
- Miscellaneous Professional, Joppa
- Mobile Restaurants, Joppa
- Modular & Mobile Homes For Sale, Joppa - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Joppa
- Mortgage Contracts & Services, Joppa
- Motor Vehicle, Joppa
- Motor Vehicle Rental & Leasing, Joppa
- Moving Companies, Joppa
- Moving Supplies & Equipment Rental, Joppa
- Moving Truck Rental , Joppa
- Muffler Shop & Exhaust Systems, Joppa
- Music, Joppa
- Musical Instruments Repair, Sales & Service, Joppa
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