- Machine Shop, Fredericksburg
- Machine Shop & Tool Repair Service, Fredericksburg
- Machinery, Supplies & Equipment - Business Production Related, Fredericksburg
- Machinery, Supplies & Equipment - Business Supplies Related, Fredericksburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Fredericksburg
- Magazine & Newspaper Stands, Fredericksburg - Dealers & Distributors
- Magicians & Hypnotist Entertainers, Fredericksburg
- Mailbox Rental Services, Fredericksburg
- Mailing, Delivery & Courier Service, Fredericksburg
- Major Appliances, Fredericksburg - Household & Kitchen
- Management Consultants & Services, Fredericksburg
- Manicurists & Pedicurists, Fredericksburg
- Manufacturing, Fredericksburg
- Manufacturing Products, Fredericksburg
- Markets & Grocers Equipment, Fredericksburg
- Marriage & Family Counselors, Fredericksburg
- Masonry Materials & Supplies, Fredericksburg
- Massage Therapists & Professional, Fredericksburg
- Massage Therapy, Fredericksburg
- Meat Market, Wholesale & Products, Fredericksburg
- Medical Equipment & Supplies Rental & Leasing, Fredericksburg
- Medical Equipment Manufacturers, Fredericksburg
- Medical Research Facilities, Fredericksburg - Research & Development Centers
- Medical Supplies & Equipment, Fredericksburg
- Meeting & Event Planning Services, Fredericksburg - Conference Consultants
- Membership Sports & Recreation Clubs, Fredericksburg
- Memory Improvement Instruction, Fredericksburg
- Men's & Boys Clothing & Accessories Stores, Fredericksburg
- Men's Clothing Stores, Fredericksburg - Clothes & Accessories
- Mens & Boys Hats, Gloves & Neckwear, Fredericksburg
- Mental & Developmental Information & Referral Services, Fredericksburg
- Mental Health Clinics, Fredericksburg - Treatment Centers
- Mental Health Specialists, Fredericksburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Fredericksburg
- Metal Buildings, Fredericksburg - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Fredericksburg - Iron Works
- Methodist Church, Fredericksburg
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- Mexican Restaurants, Fredericksburg
- Mini & Self Storage, Fredericksburg
- Mining, Fredericksburg
- Miscellaneous Retail Stores, Fredericksburg
- Miscellaneous Agriculture, Fredericksburg
- Miscellaneous Business Services, Fredericksburg
- Miscellaneous Government, Fredericksburg
- Miscellaneous Manufacturing, Fredericksburg
- Miscellaneous Personal Services, Fredericksburg
- Miscellaneous Photographers, Fredericksburg
- Miscellaneous Professional, Fredericksburg
- Mission Churches, Fredericksburg
- Mobile Home Parks & Communities , Fredericksburg
- Money Transfer Service, Fredericksburg
- Monuments, Tombstones, Markers & Memorials, Fredericksburg
- Mortgage Bankers & Correspondents, Fredericksburg
- Mortgage Companies, Fredericksburg
- Motion Picture & Television Production Services, Fredericksburg
- Motor Vehicle, Fredericksburg
- Motor Vehicle Rental & Leasing, Fredericksburg
- Motorcycle & ATV Repair & Service, Fredericksburg
- Motorcycle Parts, Accessories & Dealers, Fredericksburg
- Motorcycle Repair & Service, Fredericksburg
- Movie Theaters, Fredericksburg
- Moving & Storage Supplies & Equipment, Fredericksburg
- Moving Supplies & Equipment Rental, Fredericksburg
- Moving Truck Rental , Fredericksburg
- Muffler Shop & Exhaust Systems, Fredericksburg
- Museums, Fredericksburg
- Music, Fredericksburg
- Music Lessons, Fredericksburg
- Music Lessons - Instrumental, Fredericksburg
- Musical Instruments & Equipment Stores, Fredericksburg
- Musical Instruments - Guitars, Fredericksburg
- Musical Instruments Repair, Sales & Service, Fredericksburg
- Musical Recording Services, Fredericksburg
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