- Machine Shop & Tool Repair Service, Alexandria
- Machinery, Supplies & Equipment - Business Supplies Related, Alexandria
- Machinery, Supplies & Equipment - Construction & Contractor Related, Alexandria
- Mailing, Delivery & Courier Service, Alexandria
- Major Appliances, Alexandria - Household & Kitchen
- Management Consultants & Services, Alexandria
- Manufacturers Agents & Representatives, Alexandria
- Manufacturers Representative, Alexandria - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Alexandria
- Manufacturing Products, Alexandria
- Masonry Materials & Supplies, Alexandria
- Medical Supplies & Equipment, Alexandria
- Mens & Womens Clothing, Alexandria
- Mental Health Clinics, Alexandria - Treatment Centers
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- Mental Health Specialists, Alexandria - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Alexandria - Iron Works
- Mini & Self Storage, Alexandria
- Miscellaneous Government, Alexandria
- Miscellaneous Manufacturing, Alexandria
- Miscellaneous Professional, Alexandria
- Moldings Materials, Alexandria
- Motor Sports, Alexandria
- Motor Vehicle, Alexandria
- Motor Vehicle Rental & Leasing, Alexandria
- Motorcycle Parts, Accessories & Dealers, Alexandria
- Moving Truck Rental , Alexandria
- Music, Alexandria
- Musical Instruments & Equipment Stores, Alexandria
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