- Machine Shop & Tool Repair Service, Jacksonville
- Machinery, Supplies & Equipment - Business Supplies Related, Jacksonville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Jacksonville
- Management Consultants & Services, Jacksonville
- Management Training & Development, Jacksonville
- Manicurists & Pedicurists, Jacksonville
- Manufacturing, Jacksonville
- Manufacturing Products, Jacksonville
- Medical & Dental Assistant Schools, Jacksonville
- Mental Health Clinics, Jacksonville - Treatment Centers
- Mental Health Specialists, Jacksonville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Jacksonville
- Methodist Church, Jacksonville
- Mexican Restaurants, Jacksonville
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- Miscellaneous Business Services, Jacksonville
- Miscellaneous Government, Jacksonville
- Miscellaneous Personal Services, Jacksonville
- Miscellaneous Professional, Jacksonville
- Mission Churches, Jacksonville
- Monuments, Tombstones, Markers & Memorials, Jacksonville
- Mortgage Bankers & Correspondents, Jacksonville
- Mortgages & Loans, Jacksonville
- Motor Vehicle, Jacksonville
- Motor Vehicle Rental & Leasing, Jacksonville
- Moving & Storage Supplies & Equipment, Jacksonville
- Moving Companies, Jacksonville
- Moving Truck Rental , Jacksonville
- Muffler Shop & Exhaust Systems, Jacksonville
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