- Machine Shop & Tool Repair Service, Ashburn
- Machinery, Supplies & Equipment - Business Production Related, Ashburn
- Machinery, Supplies & Equipment - Business Supplies Related, Ashburn
- Machinery, Supplies & Equipment - Construction & Contractor Related, Ashburn
- Magazine Ads, Ashburn - Periodical Advertising
- Mail Delivery Service, Ashburn
- Mailbox Rental Services, Ashburn
- Mailing, Delivery & Courier Service, Ashburn
- Maintenance, Cleaning & Sanitation, Ashburn
- Make Up & Cosmetics Application, Ashburn
- Malls & Shopping Centers, Ashburn
- Management Consultants & Services, Ashburn
- Manicurists & Pedicurists, Ashburn
- Manufacturers Agents & Representatives, Ashburn
- Manufacturers Representative, Ashburn - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Ashburn
- Manufacturing & Industrial Consultants, Ashburn
- Marinas & Aquariums, Ashburn
- Market Research & Analysis , Ashburn - Market Analysis, Business & Economic Research
- Marketing Schools, Ashburn
- Marriage & Family Counselors, Ashburn
- Martial Arts & Self Defense Schools, Ashburn
- Masonry Contractors, Ashburn - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Ashburn
- Massage Therapists & Professional, Ashburn
- Massage Therapy, Ashburn
- Massage Therapy Relaxation, Ashburn
- Mechanical Contractors, Ashburn - Install, Service & Repair
- Mechanical Engineer, Ashburn - Mechanical Engineering Service
- Medical & Dental Management, Ashburn
- Medical Research, Ashburn
- Medical Research & Development, Ashburn - Medical Information & Research
- Medical Supplies & Equipment, Ashburn
- Mediterranean Restaurants, Ashburn
- Meeting & Event Planning Services, Ashburn - Conference Consultants
- Membership Sports & Recreation Clubs, Ashburn
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- Mental Health Specialists, Ashburn - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Ashburn
- Merger & Acquisition Services, Ashburn
- Methodist Church, Ashburn
- Mexican Restaurants, Ashburn
- Middle Eastern Restaurants, Ashburn
- Mildew Removal & Control, Ashburn - Mold Removal
- Millwork Contractors, Ashburn
- Mind-Body Massage, Ashburn
- Minerals, Ashburn
- Mini & Self Storage, Ashburn
- Miniatures Collectors, Ashburn
- Miscellaneous Agriculture, Ashburn
- Miscellaneous Business Services, Ashburn
- Miscellaneous Government, Ashburn
- Miscellaneous Manufacturing, Ashburn
- Miscellaneous Personal Services, Ashburn
- Miscellaneous Photographers, Ashburn
- Miscellaneous Professional, Ashburn
- Money Counting & Wrapping, Ashburn
- Mortgage Bankers & Correspondents, Ashburn
- Mortgage Contracts & Services, Ashburn
- Mortgages & Loans, Ashburn
- Motor Vehicle, Ashburn
- Motor Vehicle Rental & Leasing, Ashburn
- Movie Theaters, Ashburn
- Moving & Storage Supplies & Equipment, Ashburn
- Moving Companies, Ashburn
- Mulch, Peat & Moss Products, Ashburn
- Murals & Faux Finish Walls, Ashburn
- Museums, Ashburn
- Music, Ashburn
- Music Entertainment, Ashburn
- Music Lessons, Ashburn
- Music Lessons - Instrumental, Ashburn
- Musicians, Bands & Disc Jockeys, Ashburn
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