- Machine Shop, Randallstown
- Machinery Repair & Rebuild, Randallstown
- Machinery, Supplies & Equipment - Business Production Related, Randallstown
- Machinery, Supplies & Equipment - Business Supplies Related, Randallstown
- Machinery, Supplies & Equipment - Construction & Contractor Related, Randallstown
- Magicians & Hypnotist Entertainers, Randallstown
- Mail Delivery Service, Randallstown
- Mailing, Delivery & Courier Service, Randallstown
- Major Appliances, Randallstown - Household & Kitchen
- Management Consultants & Services, Randallstown
- Manicurists & Pedicurists, Randallstown
- Manufacturing, Randallstown
- Marble, Randallstown
- Marriage & Family Counselors, Randallstown
- Martial Arts & Self Defense Schools, Randallstown
- Masonry Materials & Supplies, Randallstown
- Mechanical Engineer, Randallstown - Mechanical Engineering Service
- Medical & Dental Assistant Schools, Randallstown
- Medical Billing Services, Randallstown
- Medical Diagnostic Clinics, Randallstown - Clinical Labs & Centers
- Medical Groups & Clinics, Randallstown - Medical & Health Centers
- Membership Sports & Recreation Clubs, Randallstown
- Mental Health Specialists, Randallstown - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Randallstown
- Mini & Self Storage, Randallstown
- Ministries Church, Randallstown
- Mirrors, Randallstown - Custom, Framed, Bathroom, Vanity & Wall Mirrors
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- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Randallstown
- Miscellaneous Government, Randallstown
- Miscellaneous Manufacturing, Randallstown
- Miscellaneous Personal Services, Randallstown
- Miscellaneous Professional, Randallstown
- Mission Churches, Randallstown
- Modular & Mobile Homes For Sale, Randallstown - Manufactured Homes Sale & Service
- Money Transfer Service, Randallstown
- Mortgage Bankers & Correspondents, Randallstown
- Mortgage Contracts & Services, Randallstown
- Mortgages & Loans, Randallstown
- Mortgages Commercial & Industrial, Randallstown
- Mosques, Randallstown
- Motion Picture Pre & Post Production Services, Randallstown
- Motor Vehicle, Randallstown
- Motor Vehicle Rental & Leasing, Randallstown
- Motorcycle & Motor Scooters Dealers, Repair & Service, Randallstown
- Motorcycle Parts, Accessories & Dealers, Randallstown
- Motorcycle Repair & Service, Randallstown
- Moving Companies, Randallstown
- Moving Supplies & Equipment Rental, Randallstown
- Moving Truck Rental , Randallstown
- Muffler Shop & Exhaust Systems, Randallstown
- Music, Randallstown
- Musical Instruments Repair, Sales & Service, Randallstown
- Musical Recording Services, Randallstown
- Muslim Church, Randallstown
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