- Machine Shop, Carthage
- Mail Delivery Service, Carthage
- Management Consultants & Services, Carthage
- Manicurists & Pedicurists, Carthage
- Manufacturing, Carthage
- Masonry Materials & Supplies, Carthage
- Medical Groups & Clinics, Carthage - Medical & Health Centers
- Membership Sports & Recreation Clubs, Carthage
- Methodist Church, Carthage
- Mexican Restaurants, Carthage
- Miscellaneous Business Credit Institutions & Services, Carthage
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- Miscellaneous Agriculture, Carthage
- Miscellaneous Government, Carthage
- Miscellaneous Personal Services, Carthage
- Miscellaneous Professional, Carthage
- Mortgage Bankers & Correspondents, Carthage
- Mortgages & Loans, Carthage
- Motor Vehicle, Carthage
- Motor Vehicle Rental & Leasing, Carthage
- Moving Supplies & Equipment Rental, Carthage
- Moving Truck Rental , Carthage
- Muffler Shop & Exhaust Systems, Carthage
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