- Machinery Movers & Erectors, Reston
- Machinery, Supplies & Equipment - Business Production Related, Reston
- Machinery, Supplies & Equipment - Business Supplies Related, Reston
- Machinery, Supplies & Equipment - Construction & Contractor Related, Reston
- Magazine & Newspaper Stands, Reston - Dealers & Distributors
- Mailbox Rental Services, Reston
- Mailing List Service, Brokers & Compilers, Reston
- Mailing, Delivery & Courier Service, Reston
- Malls & Shopping Centers, Reston
- Malpractice Attorneys & Lawyers, Reston
- Malpractice Attorneys & Lawyers, Reston
- Malpractice Lawyers & Attorneys, Reston
- Management Consultants & Services, Reston
- Management Training & Development, Reston
- Mandarin Restaurants, Reston
- Manicurists & Pedicurists, Reston
- Manufacturers Agents & Representatives, Reston
- Manufacturers Representative, Reston - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Reston
- Manufacturing & Industrial Consultants, Reston
- Manufacturing Products, Reston
- Marine Documentation & Registries, Reston
- Market Research & Analysis , Reston - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Reston
- Martial Arts & Self Defense Schools, Reston
- Masonry Contractors, Reston - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Reston
- Massage Therapy, Reston
- Meat Market, Wholesale & Products, Reston
- Mechanical Contractors, Reston - Install, Service & Repair
- Media Research, Reston
- Medical & Dental Management, Reston
- Medical & Health Service Organizations, Reston
- Medical Billing Services, Reston
- Medical Diagnostic Clinics, Reston - Clinical Labs & Centers
- Medical Groups & Clinics, Reston - Medical & Health Centers
- Medical Research, Reston
- Medical Research & Development, Reston - Medical Information & Research
- Medical Supplies & Equipment, Reston
- Membership Sports & Recreation Clubs, Reston
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- Men's & Boys Clothing & Accessories Stores, Reston
- Men's Clothing Stores, Reston - Clothes & Accessories
- Mens & Boys Hats, Gloves & Neckwear, Reston
- Mental Health Specialists, Reston - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Reston - Iron Works
- Metaphysical Churches, Reston
- Mexican Restaurants, Reston
- Middle Eastern Restaurants, Reston
- Mini & Self Storage, Reston
- Miscellaneous Household Item Repair, Reston
- Miscellaneous Business Services, Reston
- Miscellaneous Government, Reston
- Miscellaneous Manufacturing, Reston
- Miscellaneous Personal Services, Reston
- Miscellaneous Photographers, Reston
- Miscellaneous Professional, Reston
- Modular & Mobile Homes For Sale, Reston - Manufactured Homes Sale & Service
- Modular Buildings, Reston - Modular Homes Buildings & Offices
- Mortgage Bankers & Correspondents, Reston
- Mortgage Contracts & Services, Reston
- Mortgages & Loans, Reston
- Motion Picture & Television Production Services, Reston
- Motion Picture Pre & Post Production Services, Reston
- Motor Vehicle, Reston
- Motor Vehicle Rental & Leasing, Reston
- Motorcycle Parts, Accessories & Dealers, Reston
- Movie Theaters, Reston
- Moving & Storage Supplies & Equipment, Reston
- Moving Companies, Reston
- Moving Supplies & Equipment Rental, Reston
- Moving Truck Rental , Reston
- Muffler Shop & Exhaust Systems, Reston
- Multimedia Publishers, Reston - Multimedia Services & Systems
- Museums, Reston
- Music, Reston
- Music Entertainment, Reston
- Music Lessons, Reston
- Music Lessons - Instrumental, Reston
- Musical Instruments & Equipment Stores, Reston
- Musicians, Bands & Disc Jockeys, Reston
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