- Machinery, Supplies & Equipment - Business Supplies Related, Rockmart
- Machinery, Supplies & Equipment - Construction & Contractor Related, Rockmart
- Manicurists & Pedicurists, Rockmart
- Manufacturing, Rockmart
- Manufacturing Products, Rockmart
- Masonry Materials & Supplies, Rockmart
- Meat Market, Wholesale & Products, Rockmart
- Membership Sports & Recreation Clubs, Rockmart
- Mental Health Clinics, Rockmart - Treatment Centers
- Merle Norman Cosmetics, Rockmart
- Methodist Church, Rockmart
- Mexican Restaurants, Rockmart
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- Mini & Self Storage, Rockmart
- Ministries Church, Rockmart
- Miscellaneous Government, Rockmart
- Miscellaneous Personal Services, Rockmart
- Miscellaneous Professional, Rockmart
- Mortgage Bankers & Correspondents, Rockmart
- Motion Picture Pre & Post Production Services, Rockmart
- Motor Vehicle, Rockmart
- Motor Vehicle Rental & Leasing, Rockmart
- Moving Truck Rental , Rockmart
- Muffler Shop & Exhaust Systems, Rockmart
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