- Machine Shop, Petal
- Machinery, Supplies & Equipment - Business Production Related, Petal
- Machinery, Supplies & Equipment - Construction & Contractor Related, Petal
- Mailing, Delivery & Courier Service, Petal
- Management Consultants & Services, Petal
- Manicurists & Pedicurists, Petal
- Manufactured & Mobile Home Movers & Transporting, Petal
- Manufacturing, Petal
- Martial Arts & Self Defense Schools, Petal
- Masonry Materials & Supplies, Petal
- Massage Therapy, Petal
- Mastectomy Apparel, Forms, Prostheses & Supplies, Petal
- Meat Market, Wholesale & Products, Petal
- Medical & Dental Management, Petal
- Medical Management & Business Administration Service, Petal
- Medical Supplies & Equipment, Petal
- Membership Sports & Recreation Clubs, Petal
- Merle Norman Cosmetics, Petal
- Methodist Church, Petal
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- Mexican Restaurants, Petal
- Millwork Contractors, Petal
- Mining, Petal
- Mining Equipment & Supplies, Petal
- Miscellaneous Agriculture, Petal
- Miscellaneous Government, Petal
- Miscellaneous Personal Services, Petal
- Miscellaneous Photographers, Petal
- Miscellaneous Professional, Petal
- Mission Churches, Petal
- Mortgage Bankers & Correspondents, Petal
- Motor Vehicle, Petal
- Motor Vehicle Rental & Leasing, Petal
- Motorcycle & Motor Scooters Dealers, Repair & Service, Petal
- Motorcycle Parts, Accessories & Dealers, Petal
- Motorcycle Repair & Service, Petal
- Moving Supplies & Equipment Rental, Petal
- Moving Truck Rental , Petal
- Muffler Shop & Exhaust Systems, Petal
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