- Machine Shop & Tool Repair Service, Gwynn Oak
- Machinery, Supplies & Equipment - Business Production Related, Gwynn Oak
- Machinery, Supplies & Equipment - Business Supplies Related, Gwynn Oak
- Machinery, Supplies & Equipment - Construction & Contractor Related, Gwynn Oak
- Mail Delivery Service, Gwynn Oak
- Mailing, Delivery & Courier Service, Gwynn Oak
- Maintenance, Cleaning & Sanitation, Gwynn Oak
- Major Appliances, Gwynn Oak - Household & Kitchen
- Malpractice Attorneys & Lawyers, Gwynn Oak
- Malpractice Attorneys & Lawyers, Gwynn Oak
- Malpractice Lawyers & Attorneys, Gwynn Oak
- Management Consultants & Services, Gwynn Oak
- Manicurists & Pedicurists, Gwynn Oak
- Manufacturing, Gwynn Oak
- Marriage & Family Counselors, Gwynn Oak
- Martial Arts & Self Defense Schools, Gwynn Oak
- Masonry Contractors, Gwynn Oak - Stone Mason, Brick Mason - Install & Repair
- Masonry Contractors Commercial & Industrial, Gwynn Oak
- Massage Therapy, Gwynn Oak
- Material Handling & Heavy Machinery & Equipment, Gwynn Oak
- Mausoleums Developers, Gwynn Oak
- Meat Market, Wholesale & Products, Gwynn Oak
- Mechanical Contractors, Gwynn Oak - Install, Service & Repair
- Membership Sports & Recreation Clubs, Gwynn Oak
- Men's Clothing Stores, Gwynn Oak - Clothes & Accessories
- Mental Health Specialists, Gwynn Oak - Psychologist, Psychiatrist, Psychotherapist, etc
- Messenger Service, Gwynn Oak - Message Receiving & Forwarding Service
- Metal Tablets, Gwynn Oak
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- Metaphysical Churches, Gwynn Oak
- Methodist Church, Gwynn Oak
- Mexican Restaurants, Gwynn Oak
- Middle Eastern Restaurants, Gwynn Oak
- Ministries Church, Gwynn Oak
- Miscellaneous Government, Gwynn Oak
- Miscellaneous Manufacturing, Gwynn Oak
- Miscellaneous Personal Services, Gwynn Oak
- Miscellaneous Professional, Gwynn Oak
- Modeling & Talent Agencies, Gwynn Oak
- Monuments, Tombstones, Markers & Memorials, Gwynn Oak
- Mopeds, Scooter & Mini-Bikes Parts, Accessories & Dealers, Gwynn Oak
- Mortgage Bankers & Correspondents, Gwynn Oak
- Mortgage Companies, Gwynn Oak
- Mortgage Contracts & Services, Gwynn Oak
- Mortgages Commercial & Industrial, Gwynn Oak
- Motion Picture Pre & Post Production Services, Gwynn Oak
- Motor Vehicle, Gwynn Oak
- Motor Vehicle Rental & Leasing, Gwynn Oak
- Moving & Storage Consultants, Gwynn Oak
- Moving Companies, Gwynn Oak
- Moving Supplies & Equipment Rental, Gwynn Oak
- Moving Truck Rental , Gwynn Oak
- Museums, Gwynn Oak
- Music, Gwynn Oak
- Musical Instrument Rental, Gwynn Oak - Band & Orchestra Instruments
- Musical Recording Services, Gwynn Oak
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