- Machine Shop, Frederick
- Machine Shop & Tool Repair Service, Frederick
- Machinery And Equipment Manufacturers, Frederick
- Machinery, Supplies & Equipment - Business Production Related, Frederick
- Machinery, Supplies & Equipment - Business Supplies Related, Frederick
- Machinery, Supplies & Equipment - Construction & Contractor Related, Frederick
- Mail Boxes Manufacturers, Frederick
- Mail Delivery Service, Frederick
- Mailbox Rental Services, Frederick
- Mailing, Delivery & Courier Service, Frederick
- Maintenance, Cleaning & Sanitation, Frederick
- Major Appliances, Frederick - Household & Kitchen
- Malls & Shopping Centers, Frederick
- Malpractice Attorneys & Lawyers, Frederick
- Mammography Clinics, Frederick - Breast Cancer Screening
- Management Consultants & Services, Frederick
- Management Training & Development, Frederick
- Manicurists & Pedicurists, Frederick
- Manufacturers Agents & Representatives, Frederick
- Manufacturers Representative, Frederick - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Frederick
- Manufacturing Products, Frederick
- Map Publishers & Printers, Frederick
- Mapping & Topographical Services, Frederick
- Marble, Frederick
- Marble Tile, Frederick
- Marine Electronic Equipment, Frederick
- Market Research & Analysis , Frederick - Market Analysis, Business & Economic Research
- Marking, Stamping & Engraving Equipment, Frederick
- Marriage & Family Counselors, Frederick
- Marriage & Family Counselors Information & Referrals, Frederick
- Martial Arts & Self Defense Schools, Frederick
- Masonry Contractors, Frederick - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Frederick
- Massage Therapists & Professional, Frederick
- Massage Therapy, Frederick
- Mastectomy Apparel, Forms, Prostheses & Supplies, Frederick
- Material Handling Equipment, Frederick - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Frederick
- Mechanical Contractors, Frederick - Install, Service & Repair
- Mechanical Engineer, Frederick - Mechanical Engineering Service
- Medical & Dental Associations, Frederick
- Medical & Dental Management, Frederick
- Medical & Health Service Organizations, Frederick
- Medical Billing Services, Frederick
- Medical Diagnostic Clinics, Frederick - Clinical Labs & Centers
- Medical Equipment Manufacturers, Frederick
- Medical Groups & Clinics, Frederick - Medical & Health Centers
- Medical Management & Business Administration Service, Frederick
- Medical Research, Frederick
- Medical Research & Development, Frederick - Medical Information & Research
- Medical Supplies & Equipment, Frederick
- Mediterranean Restaurants, Frederick
- Meeting & Event Planning Services, Frederick - Conference Consultants
- Membership Sports & Recreation Clubs, Frederick
- Men's Clothing Stores, Frederick - Clothes & Accessories
- Men's Shoe Stores, Frederick
- Mental Health Specialists, Frederick - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Frederick
- Messianic Synagogues, Frederick
- Metal Boxes & Containers, Frederick
- Metal Finishers, Frederick
- Metal Plating & Polishing, Frederick
- Metal Powder Products, Frederick
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- Metal Products, Frederick
- Metal Repair Service & Blacksmith, Frederick - Iron Works
- Metal Specialties, Frederick
- Metaphysical Churches, Frederick
- Methodist Church, Frederick
- Mexican Restaurants, Frederick
- Microwave Communications, Frederick
- Microwave Ovens, Frederick
- Mildew Removal & Control, Frederick - Mold Removal
- Millwork Contractors, Frederick
- Minerals, Frederick
- Mini & Self Storage, Frederick
- Mining, Frederick
- Mirrors, Frederick - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Frederick
- Miscellaneous Retail Stores, Frederick
- Miscellaneous Agriculture, Frederick
- Miscellaneous Business Services, Frederick
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Frederick
- Miscellaneous Government, Frederick
- Miscellaneous Manufacturing, Frederick
- Miscellaneous Personal Services, Frederick
- Miscellaneous Photographers, Frederick
- Miscellaneous Professional, Frederick
- Mission Churches, Frederick
- Modular & Mobile Homes For Sale, Frederick - Manufactured Homes Sale & Service
- Modular Buildings, Frederick - Modular Homes Buildings & Offices
- Moisture & Vapor Control, Frederick
- Monuments, Tombstones, Markers & Memorials, Frederick
- Mopeds, Scooter & Mini-Bikes Parts, Accessories & Dealers, Frederick
- Mortgage Bankers & Correspondents, Frederick
- Mortgage Companies, Frederick
- Mortgage Contracts & Services, Frederick
- Mortgages & Loans, Frederick
- Mortgages Commercial & Industrial, Frederick
- Motion Picture & Television Production Services, Frederick
- Motion Picture Dists & Producers, Frederick
- Motion Picture Pre & Post Production Services, Frederick
- Motion Pictures Video Tape Duplication & Transfer Services, Frederick
- Motor Vehicle, Frederick
- Motor Vehicle Rental & Leasing, Frederick
- Motorcycle & Motor Scooters Dealers, Repair & Service, Frederick
- Motorcycle Parts, Accessories & Dealers, Frederick
- Motorcycle Repair & Service, Frederick
- Motorcycles Paint & Refinishing, Frederick
- Motorized Bicycle & Scooter, Frederick
- Mountain & Rock Climbing Equipment, Frederick
- Movie Theaters, Frederick
- Moving & Storage Consultants, Frederick
- Moving & Storage Supplies & Equipment, Frederick
- Moving Companies, Frederick
- Moving Services - Labor & Material, Frederick
- Moving Supplies & Equipment Rental, Frederick
- Moving Truck Rental , Frederick
- Muffler Shop & Exhaust Systems, Frederick
- Mulch, Peat & Moss Products, Frederick
- Museums, Frederick
- Music, Frederick
- Music Lessons, Frederick
- Music Lessons - Instrumental, Frederick
- Musical Instrument Manufacturers, Frederick
- Musical Instrument Rental, Frederick - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Frederick
- Musical Instruments Repair, Sales & Service, Frederick
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