- Machine Shop, Blacksburg
- Machine Shop & Tool Repair Service, Blacksburg
- Machine Tools , Blacksburg
- Machinery And Equipment Manufacturers, Blacksburg
- Machinery Custom Design Manufacturers, Blacksburg
- Machinery Movers & Erectors, Blacksburg
- Machinery, Supplies & Equipment - Business Production Related, Blacksburg
- Machinery, Supplies & Equipment - Business Supplies Related, Blacksburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Blacksburg
- Mailbox Rental Services, Blacksburg
- Mailing, Delivery & Courier Service, Blacksburg
- Maintenance, Cleaning & Sanitation, Blacksburg
- Major Appliances, Blacksburg - Household & Kitchen
- Malls & Shopping Centers, Blacksburg
- Management Consultants & Services, Blacksburg
- Manicurists & Pedicurists, Blacksburg
- Manufacturers Agents & Representatives, Blacksburg
- Manufacturers Representative, Blacksburg - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Blacksburg
- Marriage & Family Counselors, Blacksburg
- Masonry Materials & Supplies, Blacksburg
- Massage Therapists & Professional, Blacksburg
- Massage Therapy, Blacksburg
- Medical & Dental Management, Blacksburg
- Medical Diagnostic Clinics, Blacksburg - Clinical Labs & Centers
- Medical Research, Blacksburg
- Medical Research & Development, Blacksburg - Medical Information & Research
- Medical Supplies & Equipment, Blacksburg
- Membership Sports & Recreation Clubs, Blacksburg
- Men's Clothing Stores, Blacksburg - Clothes & Accessories
- Mental Health Specialists, Blacksburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Blacksburg
- Merchandising & Pricing Equipment, Blacksburg
- Metaphysical Churches, Blacksburg
- Methodist Church, Blacksburg
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- Mexican Restaurants, Blacksburg
- Microwave Oven Repair & Service, Blacksburg
- Middle Eastern Restaurants, Blacksburg
- Mini & Self Storage, Blacksburg
- Mining, Blacksburg
- Mining Services, Blacksburg
- Miscellaneous Household Item Repair, Blacksburg
- Miscellaneous Business Services, Blacksburg
- Miscellaneous Government, Blacksburg
- Miscellaneous Manufacturing, Blacksburg
- Miscellaneous Personal Services, Blacksburg
- Miscellaneous Photographers, Blacksburg
- Miscellaneous Professional, Blacksburg
- Monuments, Tombstones, Markers & Memorials, Blacksburg
- Mortgage Bankers & Correspondents, Blacksburg
- Mortgage Companies, Blacksburg
- Mortgages & Loans, Blacksburg
- Motor Vehicle, Blacksburg
- Motor Vehicle Rental & Leasing, Blacksburg
- Motorcycle & Motor Scooters Dealers, Repair & Service, Blacksburg
- Motorcycle Parts, Accessories & Dealers, Blacksburg
- Motorcycle Repair & Service, Blacksburg
- Moving & Storage Supplies & Equipment, Blacksburg
- Moving Companies, Blacksburg
- Moving Supplies & Equipment Rental, Blacksburg
- Moving Truck Rental , Blacksburg
- Muffler Shop & Exhaust Systems, Blacksburg
- Museums, Blacksburg
- Music, Blacksburg
- Music Entertainment, Blacksburg
- Music Lessons, Blacksburg
- Music Lessons - Instrumental, Blacksburg
- Musical Instrument Rental, Blacksburg - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Blacksburg
- Musical Instruments Repair, Sales & Service, Blacksburg
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