- Machine Tools , Ellicott City
- Machinery Repair & Rebuild, Ellicott City
- Machinery, Supplies & Equipment - Business Production Related, Ellicott City
- Machinery, Supplies & Equipment - Business Supplies Related, Ellicott City
- Machinery, Supplies & Equipment - Construction & Contractor Related, Ellicott City
- Mailbox Rental Services, Ellicott City
- Mailboxes Retail, Ellicott City
- Mailing, Delivery & Courier Service, Ellicott City
- Major Appliances, Ellicott City - Household & Kitchen
- Malls & Shopping Centers, Ellicott City
- Management Consultants & Services, Ellicott City
- Manicurists & Pedicurists, Ellicott City
- Manifold Business Forms Manufacturers, Ellicott City
- Manufacturers Agents & Representatives, Ellicott City
- Manufacturers Representative, Ellicott City - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Ellicott City
- Manufacturing Equipment & Supplies, Ellicott City
- Manufacturing Products, Ellicott City
- Map Publishers & Printers, Ellicott City
- Mapping & Topographical Services, Ellicott City
- Maps & Globes, Ellicott City
- Maps & Supplies, Ellicott City
- Marriage & Family Counselors, Ellicott City
- Martial Arts & Self Defense Schools, Ellicott City
- Masonry Contractors, Ellicott City - Stone Mason, Brick Mason - Install & Repair
- Masonry Contractors Commercial & Industrial, Ellicott City
- Massage Therapists & Professional, Ellicott City
- Massage Therapy, Ellicott City
- Material Handling Equipment, Ellicott City - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Ellicott City
- Mechanical Contractors, Ellicott City - Install, Service & Repair
- Medical & Dental Management, Ellicott City
- Medical & Health Service Organizations, Ellicott City
- Medical Diagnostic Clinics, Ellicott City - Clinical Labs & Centers
- Medical Groups & Clinics, Ellicott City - Medical & Health Centers
- Medical Supplies & Equipment, Ellicott City
- Meeting & Event Planning Services, Ellicott City - Conference Consultants
- Membership Sports & Recreation Clubs, Ellicott City
- Men's Clothing Stores, Ellicott City - Clothes & Accessories
- Mental Health Specialists, Ellicott City - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Ellicott City - Kits, Homes, Steel Buildings, etc
- Metal Products, Ellicott City
- Metaphysical Churches, Ellicott City
- Methodist Church, Ellicott City
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- Mexican Restaurants, Ellicott City
- Midwives, Ellicott City
- Millwork Contractors, Ellicott City
- Mini & Self Storage, Ellicott City
- Mirrors, Ellicott City - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Credit Institutions & Services, Ellicott City
- Miscellaneous Household Item Repair, Ellicott City
- Miscellaneous Business Services, Ellicott City
- Miscellaneous Government, Ellicott City
- Miscellaneous Manufacturing, Ellicott City
- Miscellaneous Personal Services, Ellicott City
- Miscellaneous Photographers, Ellicott City
- Miscellaneous Professional, Ellicott City
- Mobile Home Contractors, Ellicott City
- Mobile Home Improvements & Repairs, Ellicott City
- Modular & Mobile Homes For Sale, Ellicott City - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Ellicott City
- Mortgage Companies, Ellicott City
- Mortgage Contracts & Services, Ellicott City
- Mortgages & Loans, Ellicott City
- Mortgages Commercial & Industrial, Ellicott City
- Mosques, Ellicott City
- Motion Picture & Television Production Services, Ellicott City
- Motion Picture Dists & Producers, Ellicott City
- Motor Vehicle, Ellicott City
- Motor Vehicle Rental & Leasing, Ellicott City
- Motorcycle & Motor Scooters Dealers, Repair & Service, Ellicott City
- Motorcycle Parts, Accessories & Dealers, Ellicott City
- Motorcycle Repair & Service, Ellicott City
- Moving & Storage Supplies & Equipment, Ellicott City
- Moving Companies, Ellicott City
- Moving Supplies & Equipment Rental, Ellicott City
- Moving Truck Rental , Ellicott City
- Muffler Shop & Exhaust Systems, Ellicott City
- Museums, Ellicott City
- Music, Ellicott City
- Music Entertainment, Ellicott City
- Music Lessons, Ellicott City
- Music Lessons - Instrumental, Ellicott City
- Musical Instrument Rental, Ellicott City - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Ellicott City
- Musical Instruments Repair, Sales & Service, Ellicott City
- Musical Recording Services, Ellicott City
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