- Machinery Movers & Erectors, Barnwell
- Manicurists & Pedicurists, Barnwell
- Manufacturing, Barnwell
- Masonry Materials & Supplies, Barnwell
- Medical Research, Barnwell
- Medical Research & Development, Barnwell - Medical Information & Research
- Mental Health Clinics, Barnwell - Treatment Centers
- Merle Norman Cosmetics, Barnwell
- Metal Repair Service & Blacksmith, Barnwell - Iron Works
- Methodist Church, Barnwell
- Mexican Restaurants, Barnwell
- Mini & Self Storage, Barnwell
- Ministries Church, Barnwell
- Miscellaneous Business Services, Barnwell
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- Miscellaneous Government, Barnwell
- Miscellaneous Personal Services, Barnwell
- Miscellaneous Photographers, Barnwell
- Mobile Home Parks & Communities , Barnwell
- Moisture & Vapor Control, Barnwell
- Mortgage Bankers & Correspondents, Barnwell
- Motor Vehicle, Barnwell
- Motor Vehicle Rental & Leasing, Barnwell
- Motorcycle Parts, Accessories & Dealers, Barnwell
- Movie Theaters, Barnwell
- Moving Truck Rental , Barnwell
- Museums, Barnwell
- Music, Barnwell
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