- Machine Shop, South Boston
- Machine Shop & Tool Repair Service, South Boston
- Machinery And Equipment Manufacturers, South Boston
- Machinery, Supplies & Equipment - Business Production Related, South Boston
- Machinery, Supplies & Equipment - Business Supplies Related, South Boston
- Machinery, Supplies & Equipment - Construction & Contractor Related, South Boston
- Major Appliances, South Boston - Household & Kitchen
- Malls & Shopping Centers, South Boston
- Manicurists & Pedicurists, South Boston
- Manufacturing, South Boston
- Manufacturing Products, South Boston
- Marble, South Boston
- Marine Products And Services, South Boston
- Marine Services, South Boston
- Martial Arts & Self Defense Schools, South Boston
- Masonry Contractors, South Boston - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, South Boston
- Massage Therapy, South Boston
- Meat Market, Wholesale & Products, South Boston
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, South Boston
- Medical Groups & Clinics, South Boston - Medical & Health Centers
- Medical Supplies & Equipment, South Boston
- Membership Sports & Recreation Clubs, South Boston
- Men's Clothing Stores, South Boston - Clothes & Accessories
- Mental & Developmental Information & Referral Services, South Boston
- Mental Health Specialists, South Boston - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, South Boston
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- Metal Buildings, South Boston - Kits, Homes, Steel Buildings, etc
- Metal Shapes Extruded, South Boston
- Methodist Church, South Boston
- Mexican Restaurants, South Boston
- Mini & Self Storage, South Boston
- Ministries Church, South Boston
- Miscellaneous Prosthesis & Appliances, South Boston
- Miscellaneous Business Services, South Boston
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, South Boston
- Miscellaneous Government, South Boston
- Miscellaneous Photographers, South Boston
- Miscellaneous Professional, South Boston
- Mission Churches, South Boston
- Modular & Mobile Homes For Sale, South Boston - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, South Boston
- Mortgage Bankers & Correspondents, South Boston
- Mortgages & Loans, South Boston
- Motor Vehicle, South Boston
- Motor Vehicle Rental & Leasing, South Boston
- Motorcycle Parts, Accessories & Dealers, South Boston
- Movie Theaters, South Boston
- Moving Companies, South Boston
- Moving Truck Rental , South Boston
- Museums, South Boston
- Music, South Boston
- Musical Instruments & Equipment Stores, South Boston
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