- Machine Shop, South River
- Machine Shop & Tool Repair Service, South River
- Machine Tools , South River
- Machinery, Supplies & Equipment - Business Production Related, South River
- Machinery, Supplies & Equipment - Business Supplies Related, South River
- Machinery, Supplies & Equipment - Construction & Contractor Related, South River
- Mailing, Delivery & Courier Service, South River
- Maintenance, Cleaning & Sanitation, South River
- Major Appliance Repair & Service, South River
- Major Appliances, South River - Household & Kitchen
- Malls & Shopping Centers, South River
- Management Consultants & Services, South River
- Manicurists & Pedicurists, South River
- Manufacturing, South River
- Marinas & Marina Services, South River
- Marking, Stamping & Engraving Equipment, South River
- Marriage & Family Counselors, South River
- Martial Arts & Self Defense Schools, South River
- Masonry Contractors, South River - Stone Mason, Brick Mason - Install & Repair
- Material Handling Equipment, South River - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, South River
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- Medical Groups & Clinics, South River - Medical & Health Centers
- Medical Supplies & Equipment, South River
- Membership Sports & Recreation Clubs, South River
- Methodist Church, South River
- Mexican Restaurants, South River
- Middle Eastern Restaurants, South River
- Mildew Removal & Control, South River - Mold Removal
- Miscellaneous Household Item Repair, South River
- Miscellaneous Business Services, South River
- Miscellaneous Personal Services, South River
- Miscellaneous Professional, South River
- Mortgage Bankers & Correspondents, South River
- Motor Vehicle, South River
- Motor Vehicle Rental & Leasing, South River
- Moving Supplies & Equipment Rental, South River
- Moving Truck Rental , South River
- Museums, South River
- Music, South River
- Music Lessons, South River
- Music Lessons - Instrumental, South River
- Musical Recording Services, South River
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