- Machine Shop, Lorton
- Machine Shop & Tool Repair Service, Lorton
- Machine Shops Slings, Lorton
- Machinery And Equipment Manufacturers, Lorton
- Machinery, Supplies & Equipment - Business Production Related, Lorton
- Machinery, Supplies & Equipment - Business Supplies Related, Lorton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Lorton
- Mailbox Rental Services, Lorton
- Mailing, Delivery & Courier Service, Lorton
- Major Appliances, Lorton - Household & Kitchen
- Management Consultants & Services, Lorton
- Manicurists & Pedicurists, Lorton
- Manufacturing, Lorton
- Manufacturing Products, Lorton
- Marble, Lorton
- Marble Tile, Lorton
- Marinas & Marina Services, Lorton
- Marriage & Family Counselors, Lorton
- Martial Arts & Self Defense Schools, Lorton
- Masonry Contractors, Lorton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Lorton
- Meat Market, Wholesale & Products, Lorton
- Mechanical Contractors, Lorton - Install, Service & Repair
- Medical Billing Services, Lorton
- Medical Diagnostic Clinics, Lorton - Clinical Labs & Centers
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Lorton
- Medical Groups & Clinics, Lorton - Medical & Health Centers
- Medical Supplies & Equipment, Lorton
- Medical Transcription Service, Lorton
- Membership Sports & Recreation Clubs, Lorton
- Messianic Synagogues, Lorton
- Metal Buildings, Lorton - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, Lorton
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- Metal Repair Service & Blacksmith, Lorton - Iron Works
- Metal Working Machinery, Lorton
- Methodist Church, Lorton
- Mexican Restaurants, Lorton
- Middle Eastern Restaurants, Lorton
- Mini & Self Storage, Lorton
- Miscellaneous Household Item Repair, Lorton
- Miscellaneous Agriculture, Lorton
- Miscellaneous Government, Lorton
- Miscellaneous Industry, Lorton
- Miscellaneous Personal Services, Lorton
- Miscellaneous Professional, Lorton
- Mortgage Bankers & Correspondents, Lorton
- Mortgage Companies, Lorton
- Mortgages & Loans, Lorton
- Motion Picture & Television Production Services, Lorton
- Motor Vehicle, Lorton
- Motor Vehicle Rental & Leasing, Lorton
- Motorcycle Parts, Accessories & Dealers, Lorton
- Moving & Storage Consultants, Lorton
- Moving & Storage Supplies & Equipment, Lorton
- Moving Companies, Lorton
- Moving Services - Labor & Material, Lorton
- Moving Supplies & Equipment Rental, Lorton
- Moving Truck Rental , Lorton
- Mulch, Peat & Moss Products, Lorton
- Museums, Lorton
- Music, Lorton
- Music Lessons, Lorton
- Music Lessons - Instrumental, Lorton
- Musical Instrument Rental, Lorton - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Lorton
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