- Machine Shop, Jacksonville
- Machine Shop & Tool Repair Service, Jacksonville
- Machinery And Equipment Manufacturers, Jacksonville
- Machinery Custom Design Manufacturers, Jacksonville
- Machinery, Supplies & Equipment - Business Production Related, Jacksonville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Jacksonville
- Mailing, Delivery & Courier Service, Jacksonville
- Management Consultants & Services, Jacksonville
- Manicurists & Pedicurists, Jacksonville
- Manufacturing, Jacksonville
- Manufacturing Products, Jacksonville
- Marriage & Family Counselors, Jacksonville
- Masonry Materials & Supplies, Jacksonville
- Mechanical Contractors, Jacksonville - Install, Service & Repair
- Medical Records Service , Jacksonville
- Medical Supplies & Equipment, Jacksonville
- Medical Transcription Service, Jacksonville
- Membership Sports & Recreation Clubs, Jacksonville
- Men's & Boys Clothing & Accessories Stores, Jacksonville
- Mens & Boys Jeans & Western Wear Stores, Jacksonville
- Mental & Developmental Information & Referral Services, Jacksonville
- Mental Health Clinics, Jacksonville - Treatment Centers
- Mental Health Specialists, Jacksonville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Jacksonville
- Merger & Acquisition Services, Jacksonville
- Merle Norman Cosmetics, Jacksonville
- Metal Plating & Polishing, Jacksonville
- Metal Specialties, Jacksonville
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- Methodist Church, Jacksonville
- Mexican Food & Goods Products, Jacksonville
- Mexican Restaurants, Jacksonville
- Mining, Jacksonville
- Ministries Church, Jacksonville
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Jacksonville
- Miscellaneous Government, Jacksonville
- Miscellaneous Industry, Jacksonville
- Miscellaneous Manufacturing, Jacksonville
- Miscellaneous Personal Services, Jacksonville
- Miscellaneous Photographers, Jacksonville
- Miscellaneous Professional, Jacksonville
- Mission Churches, Jacksonville
- Modular & Mobile Homes For Sale, Jacksonville - Manufactured Homes Sale & Service
- Moldings Materials, Jacksonville
- Mortgage Bankers & Correspondents, Jacksonville
- Mortgage Companies, Jacksonville
- Motor Vehicle, Jacksonville
- Motor Vehicle Rental & Leasing, Jacksonville
- Motorcycle Parts, Accessories & Dealers, Jacksonville
- Movie Theaters, Jacksonville
- Moving & Storage Supplies & Equipment, Jacksonville
- Moving Supplies & Equipment Rental, Jacksonville
- Moving Truck Rental , Jacksonville
- Muffler Shop & Exhaust Systems, Jacksonville
- Mulch, Peat & Moss Products, Jacksonville
- Music, Jacksonville
- Musical Instruments Repair, Sales & Service, Jacksonville
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