- Machine Shop & Tool Repair Service, Herndon
- Machine Tools , Herndon
- Machinery, Supplies & Equipment - Business Production Related, Herndon
- Machinery, Supplies & Equipment - Business Supplies Related, Herndon
- Machinery, Supplies & Equipment - Construction & Contractor Related, Herndon
- Mailbox Rental Services, Herndon
- Mailing, Delivery & Courier Service, Herndon
- Maintenance, Cleaning & Sanitation, Herndon
- Major Appliances, Herndon - Household & Kitchen
- Management Consultants & Services, Herndon
- Manicurists & Pedicurists, Herndon
- Manufacturing, Herndon
- Manufacturing & Industrial Consultants, Herndon
- Manufacturing Equipment & Supplies, Herndon
- Manufacturing Products, Herndon
- Marble, Herndon
- Market Research & Analysis , Herndon - Market Analysis, Business & Economic Research
- Marketing Schools, Herndon
- Marriage & Family Counselors, Herndon
- Martial Arts & Self Defense Schools, Herndon
- Masonry Contractors, Herndon - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Herndon
- Masonry Panels Prefabricated, Herndon
- Massage Therapists & Professional, Herndon
- Massage Therapy, Herndon
- Mechanical Engineer, Herndon - Mechanical Engineering Service
- Medical & Dental Management, Herndon
- Medical Billing Services, Herndon
- Medical Diagnostic Clinics, Herndon - Clinical Labs & Centers
- Medical Groups & Clinics, Herndon - Medical & Health Centers
- Medical Supplies & Equipment, Herndon
- Medical Transcription Service, Herndon
- Membership Sports & Recreation Clubs, Herndon
- Mental & Developmental Information & Referral Services, Herndon
- Mental Health Specialists, Herndon - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Powder Products, Herndon
- Metal Products, Herndon
- Metal Repair Service & Blacksmith, Herndon - Iron Works
- Metal Working Machinery, Herndon
- Methodist Church, Herndon
- Mexican Restaurants, Herndon
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- Microfilm & Imaging Service, Equipment & Supplies , Herndon
- Middle Eastern Restaurants, Herndon
- Mildew Removal & Control, Herndon - Mold Removal
- Minerals, Herndon
- Mini & Self Storage, Herndon
- Mini Golf Courses, Herndon
- Mirrors, Herndon - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Herndon
- Miscellaneous Retail Stores, Herndon
- Miscellaneous Agriculture, Herndon
- Miscellaneous Business Services, Herndon
- Miscellaneous Government, Herndon
- Miscellaneous Industry, Herndon
- Miscellaneous Manufacturing, Herndon
- Miscellaneous Personal Services, Herndon
- Miscellaneous Photographers, Herndon
- Miscellaneous Professional, Herndon
- Mobile Home Parks & Communities , Herndon
- Modular & Mobile Homes For Sale, Herndon - Manufactured Homes Sale & Service
- Money Transfer Service, Herndon
- Mongolian Restaurants, Herndon
- Mopeds, Scooter & Mini-Bikes Parts, Accessories & Dealers, Herndon
- Mortgage Bankers & Correspondents, Herndon
- Mortgage Contracts & Services, Herndon
- Mortgages & Loans, Herndon
- Motion Picture & Television Production Services, Herndon
- Motion Picture Pre & Post Production Services, Herndon
- Motor Vehicle, Herndon
- Motor Vehicle Rental & Leasing, Herndon
- Motorcycle Parts, Accessories & Dealers, Herndon
- Motorized Bicycle & Scooter, Herndon
- Movie Theaters, Herndon
- Moving & Storage Consultants, Herndon
- Moving & Storage Supplies & Equipment, Herndon
- Moving Companies, Herndon
- Moving Truck Rental , Herndon
- Muffler Shop & Exhaust Systems, Herndon
- Multimedia Publishers, Herndon - Multimedia Services & Systems
- Music, Herndon
- Musical Instruments & Equipment Stores, Herndon
- Musical Instruments Repair, Sales & Service, Herndon
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