- Machine Shop, Baltimore
- Machine Shop & Tool Repair Service, Baltimore
- Machine Tools , Baltimore
- Machinery And Equipment Manufacturers, Baltimore
- Machinery Custom Design Manufacturers, Baltimore
- Machinery Movers & Erectors, Baltimore
- Machinery, Supplies & Equipment - Business Production Related, Baltimore
- Machinery, Supplies & Equipment - Business Supplies Related, Baltimore
- Machinery, Supplies & Equipment - Construction & Contractor Related, Baltimore
- Magazine & Newspaper Stands, Baltimore - Dealers & Distributors
- Magicians & Hypnotist Entertainers, Baltimore
- Magnetic & Optical Recording Media Manufacturers, Baltimore
- Magnetic Devices, Baltimore
- Magnets & Magnetic Devices, Baltimore
- Mail Delivery Service, Baltimore
- Mailbox Rental Services, Baltimore
- Mailing, Delivery & Courier Service, Baltimore
- Maintenance, Cleaning & Sanitation, Baltimore
- Major Appliances, Baltimore - Household & Kitchen
- Make Up Masquerade & Theatrical, Baltimore
- Malls & Shopping Centers, Baltimore
- Malpractice Attorneys & Lawyers, Baltimore
- Malpractice Attorneys & Lawyers, Baltimore
- Malpractice Lawyers & Attorneys, Baltimore
- Management Consultants & Services, Baltimore
- Mandarin Restaurants, Baltimore
- Manicurists & Pedicurists, Baltimore
- Manifold Business Forms Manufacturers, Baltimore
- Manufacturers Agents & Representatives, Baltimore
- Manufacturers Representative, Baltimore - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Baltimore
- Manufacturing & Industrial Consultants, Baltimore
- Manufacturing Equipment & Supplies, Baltimore
- Manufacturing Products, Baltimore
- Manufacturing Services, Baltimore
- Marble, Baltimore
- Marble Contractors, Baltimore - Installation, Cleaning & Removal Services
- Marinas & Aquariums, Baltimore
- Marinas & Marina Services, Baltimore
- Marine Contractors & Designers, Baltimore
- Marine Documentation & Registries, Baltimore
- Marine Electronic Equipment, Baltimore
- Marine Products And Services, Baltimore
- Marine Repair & Service Stations, Baltimore
- Marine Services, Baltimore
- Marine Supplies & Equipment, Baltimore - Boat Supplies
- Marine Supplies & Equipment Repair, Baltimore - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Baltimore
- Marionettes & Puppets, Baltimore
- Market Research & Analysis , Baltimore - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Baltimore
- Marketing Schools, Baltimore
- Markets & Grocers Equipment, Baltimore
- Marriage & Family Counselors, Baltimore
- Marriage & Family Counselors Information & Referrals, Baltimore
- Martial Arts & Self Defense Schools, Baltimore
- Mary Kay Cosmetics, Baltimore
- Masonry Contractors, Baltimore - Stone Mason, Brick Mason - Install & Repair
- Masonry Contractors Commercial & Industrial, Baltimore
- Masonry Materials & Supplies, Baltimore
- Massage Therapists & Professional, Baltimore
- Massage Therapy, Baltimore
- Matches, Baltimore
- Material Handling & Heavy Machinery & Equipment, Baltimore
- Material Handling Equipment, Baltimore - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Baltimore - Maternity Dress, Gown, Swimwear, Underwear & More
- Mats & Matting, Baltimore
- Meat Market, Wholesale & Products, Baltimore
- Meat Markets Kosher, Baltimore
- Mechanical Contractors, Baltimore - Install, Service & Repair
- Mechanical Engineer, Baltimore - Mechanical Engineering Service
- Medical & Dental Management, Baltimore
- Medical & Health Service Organizations, Baltimore
- Medical & Infectious Waste Disposal, Baltimore
- Medical Billing Services, Baltimore
- Medical Billing Software, Baltimore
- Medical Diagnostic Clinics, Baltimore - Clinical Labs & Centers
- Medical Equipment Manufacturers, Baltimore
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Baltimore
- Medical Groups & Clinics, Baltimore - Medical & Health Centers
- Medical Products & Equipment, Baltimore
- Medical Records Service , Baltimore
- Medical Research, Baltimore
- Medical Research & Development, Baltimore - Medical Information & Research
- Medical Supplies & Equipment, Baltimore
- Medical Transcription Service, Baltimore
- Mediterranean Restaurants, Baltimore
- Meeting & Event Planning Services, Baltimore - Conference Consultants
- Membership Sports & Recreation Clubs, Baltimore
- Men's & Boys Clothing & Accessories Stores, Baltimore
- Men's Clothing Stores, Baltimore - Clothes & Accessories
- Men's Shoe Stores, Baltimore
- Mennonite Church, Baltimore
- Mens & Boys Belts & Suspenders, Baltimore
- Mental & Developmental Information & Referral Services, Baltimore
- Mental Health Clinics, Baltimore - Treatment Centers
- Mental Health Specialists, Baltimore - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Baltimore
- Merger & Acquisition Services, Baltimore
- Messenger Service, Baltimore - Message Receiving & Forwarding Service
- Metal Boxes & Containers, Baltimore
- Metal Buildings, Baltimore - Kits, Homes, Steel Buildings, etc
- Metal Cans Manufacturers, Baltimore
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- Metal Finishers, Baltimore
- Metal Finishing Equipment & Supplies, Baltimore
- Metal Goods Alloys, Baltimore
- Metal Lockers, Baltimore
- Metal Plating & Polishing, Baltimore
- Metal Products, Baltimore
- Metal Repair Service & Blacksmith, Baltimore - Iron Works
- Metal Roll Forming Manufacturers, Baltimore
- Metal Specialties, Baltimore
- Metal Tablets, Baltimore
- Metal Working Machinery, Baltimore
- Metaphysical Churches, Baltimore
- Methodist Church, Baltimore
- Metropolitan Church, Baltimore
- Mexican Food & Goods Products, Baltimore
- Mexican Restaurants, Baltimore
- Microfilm & Imaging Service, Equipment & Supplies , Baltimore
- Microwave Communications, Baltimore
- Microwave Oven Repair & Service, Baltimore
- Middle Eastern Restaurants, Baltimore
- Midwives, Baltimore
- Mildew Removal & Control, Baltimore - Mold Removal
- Military Supplies, Baltimore
- Millwork Contractors, Baltimore
- Mini & Self Storage, Baltimore
- Mining, Baltimore
- Mining Contractors, Baltimore - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Baltimore - Mining Companies
- Ministers, Baltimore
- Ministries Church, Baltimore
- Mirrors, Baltimore - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Mirrors Manufacturers Supplies, Baltimore
- Miscellaneous Business Credit Institutions & Services, Baltimore
- Miscellaneous Business Manufacturing, Baltimore
- Miscellaneous Business Product Repair, Baltimore
- Miscellaneous Fabricated Wire Products Manufacturers, Baltimore
- Miscellaneous Household Item Repair, Baltimore
- Miscellaneous Prosthesis & Appliances, Baltimore
- Miscellaneous Agriculture, Baltimore
- Miscellaneous Business Services, Baltimore
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Baltimore
- Miscellaneous Government, Baltimore
- Miscellaneous Industry, Baltimore
- Miscellaneous Manufacturing, Baltimore
- Miscellaneous Metal Work Manufacturers, Baltimore
- Miscellaneous Personal Services, Baltimore
- Miscellaneous Photographers, Baltimore
- Miscellaneous Professional, Baltimore
- Mission Churches, Baltimore
- Mobile Home Contractors, Baltimore
- Mobile Home Improvements & Repairs, Baltimore
- Mobile Home Parks & Communities , Baltimore
- Modeling & Talent Agencies, Baltimore
- Modular & Mobile Homes For Sale, Baltimore - Manufactured Homes Sale & Service
- Moisture & Vapor Control, Baltimore
- Moldings Materials, Baltimore
- Money Counting & Wrapping, Baltimore
- Money Transfer Service, Baltimore
- Monuments, Tombstones, Markers & Memorials, Baltimore
- Mopeds & Motor Scooters Rental, Baltimore
- Mortgage Bankers & Correspondents, Baltimore
- Mortgage Brokers, Baltimore
- Mortgage Companies, Baltimore
- Mortgage Contracts & Services, Baltimore
- Mortgages & Loans, Baltimore
- Mortgages Commercial & Industrial, Baltimore
- Mosques, Baltimore
- Motion Picture & Television Production Services, Baltimore
- Motion Picture Pre & Post Production Services, Baltimore
- Motor Vehicle, Baltimore
- Motor Vehicle Rental & Leasing, Baltimore
- Motorcycle & Motor Scooters Dealers, Repair & Service, Baltimore
- Motorcycle Parts, Accessories & Dealers, Baltimore
- Motorcycle Repair & Service, Baltimore
- Motorcycles Paint & Refinishing, Baltimore
- Movie Theaters, Baltimore
- Moving & Storage Consultants, Baltimore
- Moving & Storage Supplies & Equipment, Baltimore
- Moving Boxes & Supplies, Baltimore
- Moving Companies, Baltimore
- Moving Services - Labor & Material, Baltimore
- Moving Supplies & Equipment Rental, Baltimore
- Moving Truck Rental , Baltimore
- Muffler Shop & Exhaust Systems, Baltimore
- Mulch, Peat & Moss Products, Baltimore
- Multimedia Publishers, Baltimore - Multimedia Services & Systems
- Museums, Baltimore
- Music, Baltimore
- Music Entertainment, Baltimore
- Music Lessons, Baltimore
- Music Lessons - Instrumental, Baltimore
- Music Lessons - Vocal, Baltimore
- Music Publishers & Distribution, Baltimore
- Music Teachers, Baltimore
- Musical Instrument Manufacturers, Baltimore
- Musical Instrument Rental, Baltimore - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Baltimore
- Musical Instruments - Violins, Baltimore
- Musical Instruments Repair, Sales & Service, Baltimore
- Musical Recording Services, Baltimore
- Musicians, Bands & Disc Jockeys, Baltimore
- Muslim Church, Baltimore
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