- Machine Shop & Tool Repair Service, Christiansburg
- Machine Tool Repair & Rebuild, Christiansburg
- Machine Tools , Christiansburg
- Machinery Repair & Rebuild, Christiansburg
- Machinery, Supplies & Equipment - Business Production Related, Christiansburg
- Machinery, Supplies & Equipment - Business Supplies Related, Christiansburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Christiansburg
- Mailing, Delivery & Courier Service, Christiansburg
- Major Appliance Repair & Service, Christiansburg
- Major Appliances, Christiansburg - Household & Kitchen
- Malls & Shopping Centers, Christiansburg
- Management Consultants & Services, Christiansburg
- Manicurists & Pedicurists, Christiansburg
- Manufacturing, Christiansburg
- Marble, Christiansburg
- Marine Contractors & Designers, Christiansburg
- Marriage & Family Counselors, Christiansburg
- Masonry Contractors, Christiansburg - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Christiansburg
- Massage Therapists & Professional, Christiansburg
- Massage Therapy, Christiansburg
- Maytag Appliances, Christiansburg
- Mechanical Contractors, Christiansburg - Install, Service & Repair
- Medical & Dental Management, Christiansburg
- Medical & Health Service Organizations, Christiansburg
- Medical Diagnostic Clinics, Christiansburg - Clinical Labs & Centers
- Medical Equipment Manufacturers, Christiansburg
- Medical Groups & Clinics, Christiansburg - Medical & Health Centers
- Medical Supplies & Equipment, Christiansburg
- Membership Sports & Recreation Clubs, Christiansburg
- Men's & Boys Clothing & Accessories Stores, Christiansburg
- Mennonite Church, Christiansburg
- Mens & Boys Jeans & Western Wear Stores, Christiansburg
- Mental Health Clinics, Christiansburg - Treatment Centers
- Mental Health Specialists, Christiansburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Christiansburg
- Metal Working Machinery, Christiansburg
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- Methodist Church, Christiansburg
- Mexican Restaurants, Christiansburg
- Mini & Self Storage, Christiansburg
- Mining, Christiansburg
- Mirrors, Christiansburg - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Prosthesis & Appliances, Christiansburg
- Miscellaneous Business Services, Christiansburg
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Christiansburg
- Miscellaneous Government, Christiansburg
- Miscellaneous Personal Services, Christiansburg
- Miscellaneous Photographers, Christiansburg
- Miscellaneous Professional, Christiansburg
- Mobile Home Contractors, Christiansburg
- Mobile Home Improvements & Repairs, Christiansburg
- Mobile Home Parks & Communities , Christiansburg
- Mobile Homes Anchoring Service, Christiansburg
- Modular & Mobile Homes For Sale, Christiansburg - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Christiansburg
- Mortgage Bankers & Correspondents, Christiansburg
- Mortgages & Loans, Christiansburg
- Motion Picture Pre & Post Production Services, Christiansburg
- Motor Vehicle, Christiansburg
- Motor Vehicle Rental & Leasing, Christiansburg
- Motorcycle Parts, Accessories & Dealers, Christiansburg
- Movie Theaters, Christiansburg
- Moving & Storage Supplies & Equipment, Christiansburg
- Moving Companies, Christiansburg
- Moving Supplies & Equipment Rental, Christiansburg
- Moving Truck Rental , Christiansburg
- Mowers & Tractors, Christiansburg
- Muffler Shop & Exhaust Systems, Christiansburg
- Mulch, Peat & Moss Products, Christiansburg
- Museums, Christiansburg
- Music, Christiansburg
- Musical Instrument Rental, Christiansburg - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Christiansburg
- Musical Instruments Repair, Sales & Service, Christiansburg
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