- Machine Shop & Tool Repair Service, Gaithersburg
- Machinery Balancing Equipment, Gaithersburg
- Machinery Repair & Rebuild, Gaithersburg
- Machinery, Supplies & Equipment - Business Production Related, Gaithersburg
- Machinery, Supplies & Equipment - Business Supplies Related, Gaithersburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Gaithersburg
- Magazine & Newspaper Stands, Gaithersburg - Dealers & Distributors
- Mail Delivery Service, Gaithersburg
- Mailbox Rental Services, Gaithersburg
- Mailing, Delivery & Courier Service, Gaithersburg
- Major Appliances, Gaithersburg - Household & Kitchen
- Malls & Shopping Centers, Gaithersburg
- Management Consultants & Services, Gaithersburg
- Manicurists & Pedicurists, Gaithersburg
- Manufacturers Agents & Representatives, Gaithersburg
- Manufacturers Representative, Gaithersburg - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Gaithersburg
- Manufacturing Products, Gaithersburg
- Marble, Gaithersburg
- Marble Contractors, Gaithersburg - Installation, Cleaning & Removal Services
- Marine Products And Services, Gaithersburg
- Marine Salvage & Wrecking Services, Gaithersburg
- Marine Services, Gaithersburg
- Market Research & Analysis , Gaithersburg - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Gaithersburg
- Marriage & Family Counselors, Gaithersburg
- Marriage & Family Counselors Information & Referrals, Gaithersburg
- Martial Arts & Self Defense Schools, Gaithersburg
- Masonry Contractors, Gaithersburg - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Gaithersburg
- Massage Equipment & Supplies, Gaithersburg
- Massage Therapists & Professional, Gaithersburg
- Massage Therapy, Gaithersburg
- Mats & Matting, Gaithersburg
- Meat Market, Wholesale & Products, Gaithersburg
- Meat Packers, Gaithersburg
- Mechanical Contractors, Gaithersburg - Install, Service & Repair
- Mechanical Engineer, Gaithersburg - Mechanical Engineering Service
- Medical & Dental Assistant Schools, Gaithersburg
- Medical & Dental Management, Gaithersburg
- Medical & Health Service Organizations, Gaithersburg
- Medical Alert Systems, Gaithersburg - Medical Alarms - PERS
- Medical Diagnostic Clinics, Gaithersburg - Clinical Labs & Centers
- Medical Equipment Manufacturers, Gaithersburg
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Gaithersburg
- Medical Groups & Clinics, Gaithersburg - Medical & Health Centers
- Medical Research, Gaithersburg
- Medical Research & Development, Gaithersburg - Medical Information & Research
- Medical Supplies & Equipment, Gaithersburg
- Mediterranean Restaurants, Gaithersburg
- Membership Sports & Recreation Clubs, Gaithersburg
- Men's Clothing Stores, Gaithersburg - Clothes & Accessories
- Mental Health Clinics, Gaithersburg - Treatment Centers
- Mental Health Specialists, Gaithersburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Gaithersburg
- Messenger Service, Gaithersburg - Message Receiving & Forwarding Service
- Metal Buildings, Gaithersburg - Wood Buildings
- Metal Buildings, Gaithersburg - Kits, Homes, Steel Buildings, etc
- Methodist Church, Gaithersburg
- Mexican Restaurants, Gaithersburg
- Microwave Communications, Gaithersburg
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- Microwave Ovens, Gaithersburg
- Middle Eastern Restaurants, Gaithersburg
- Military And Veteran Attorneys & Lawyers, Gaithersburg
- Military And Veteran Attorneys & Lawyers, Gaithersburg
- Military And Veteran Lawyers & Attorneys, Gaithersburg
- Military Supplies, Gaithersburg
- Millwork Contractors, Gaithersburg
- Mini & Self Storage, Gaithersburg
- Mini Golf Courses, Gaithersburg
- Ministries Church, Gaithersburg
- Mirrors, Gaithersburg - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Gaithersburg
- Miscellaneous Household Item Repair, Gaithersburg
- Miscellaneous Agriculture, Gaithersburg
- Miscellaneous Business Services, Gaithersburg
- Miscellaneous Government, Gaithersburg
- Miscellaneous Industry, Gaithersburg
- Miscellaneous Manufacturing, Gaithersburg
- Miscellaneous Personal Services, Gaithersburg
- Miscellaneous Photographers, Gaithersburg
- Miscellaneous Professional, Gaithersburg
- Mission Churches, Gaithersburg
- Moisture & Vapor Control, Gaithersburg
- Mortgage Bankers & Correspondents, Gaithersburg
- Mortgage Companies, Gaithersburg
- Mortgage Contracts & Services, Gaithersburg
- Mortgages & Loans, Gaithersburg
- Mosques, Gaithersburg
- Motion Picture & Television Production Services, Gaithersburg
- Motion Picture Pre & Post Production Services, Gaithersburg
- Motion Pictures Video Tape Duplication & Transfer Services, Gaithersburg
- Motivational Speakers & Consultants, Gaithersburg - Speakers, Lectures & Seminars
- Motor Vehicle, Gaithersburg
- Motor Vehicle Rental & Leasing, Gaithersburg
- Motorcycle & Motor Scooters Dealers, Repair & Service, Gaithersburg
- Motorcycle Parts, Accessories & Dealers, Gaithersburg
- Motorcycle Repair & Service, Gaithersburg
- Movie Theaters, Gaithersburg
- Moving & Storage Consultants, Gaithersburg
- Moving & Storage Supplies & Equipment, Gaithersburg
- Moving Companies, Gaithersburg
- Moving Services - Labor & Material, Gaithersburg
- Moving Supplies & Equipment Rental, Gaithersburg
- Moving Truck Rental , Gaithersburg
- Muffler Shop & Exhaust Systems, Gaithersburg
- Mulch, Peat & Moss Products, Gaithersburg
- Multimedia Publishers, Gaithersburg - Multimedia Services & Systems
- Music, Gaithersburg
- Music Entertainment, Gaithersburg
- Music Lessons, Gaithersburg
- Music Lessons - Instrumental, Gaithersburg
- Music Sheet, Gaithersburg
- Music Stores Retail, Gaithersburg
- Musical Instrument Manufacturers, Gaithersburg
- Musical Instrument Rental, Gaithersburg - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Gaithersburg
- Musical Instruments - Violins, Gaithersburg
- Musical Instruments Repair, Sales & Service, Gaithersburg
- Musicians, Bands & Disc Jockeys, Gaithersburg
- Muslim Church, Gaithersburg
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