- Machine Shop & Tool Repair Service, Jacksonville
- Machinery Movers & Erectors, Jacksonville
- Machinery, Supplies & Equipment - Business Production Related, Jacksonville
- Machinery, Supplies & Equipment - Business Supplies Related, Jacksonville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Jacksonville
- Magazine Printing & Publishing, Jacksonville
- Mailing, Delivery & Courier Service, Jacksonville
- Maintenance, Cleaning & Sanitation, Jacksonville
- Major Appliances, Jacksonville - Household & Kitchen
- Management Consultants & Services, Jacksonville
- Manicurists & Pedicurists, Jacksonville
- Manufacturing, Jacksonville
- Manufacturing & Industrial Consultants, Jacksonville
- Manufacturing Products, Jacksonville
- Marinas & Marina Services, Jacksonville
- Marriage & Family Counselors, Jacksonville
- Masonry Materials & Supplies, Jacksonville
- Massage Therapists & Professional, Jacksonville
- Massage Therapy, Jacksonville
- Material Handling Equipment, Jacksonville - Conveyor Belt, Pallet Jack, Forklift, etc
- Maytag Appliances, Jacksonville
- Meat Market, Wholesale & Products, Jacksonville
- Medical & Dental Management, Jacksonville
- Medical Diagnostic Clinics, Jacksonville - Clinical Labs & Centers
- Medical Supplies & Equipment, Jacksonville
- Membership Sports & Recreation Clubs, Jacksonville
- Men's Clothing Stores, Jacksonville - Clothes & Accessories
- Mental & Developmental Information & Referral Services, Jacksonville
- Mental Health Clinics, Jacksonville - Treatment Centers
- Mental Health Specialists, Jacksonville - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Jacksonville
- Merchandise Sales Events, Jacksonville
- Merle Norman Cosmetics, Jacksonville
- Metal Buildings, Jacksonville - Kits, Homes, Steel Buildings, etc
- Metals Base, Jacksonville
- Methodist Church, Jacksonville
- Mexican Restaurants, Jacksonville
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- Mildew Removal & Control, Jacksonville - Mold Removal
- Mini & Self Storage, Jacksonville
- Mining, Jacksonville
- Miscellaneous Agriculture, Jacksonville
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Jacksonville
- Miscellaneous Government, Jacksonville
- Miscellaneous Industry, Jacksonville
- Miscellaneous Personal Services, Jacksonville
- Miscellaneous Photographers, Jacksonville
- Miscellaneous Professional, Jacksonville
- Mobile Home Parks & Communities , Jacksonville
- Mobile Lube Systems, Jacksonville
- Modular & Mobile Homes For Sale, Jacksonville - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Jacksonville
- Mortgage Bankers & Correspondents, Jacksonville
- Mortgage Brokers, Jacksonville
- Mortgage Companies, Jacksonville
- Mortgage Feasibility Consultants, Jacksonville
- Mortgages & Loans, Jacksonville
- Motor Vehicle, Jacksonville
- Motor Vehicle Rental & Leasing, Jacksonville
- Motorcycle & ATV Repair & Service, Jacksonville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Jacksonville
- Motorcycle Parts, Accessories & Dealers, Jacksonville
- Motorcycle Repair & Service, Jacksonville
- Movie Theaters, Jacksonville
- Moving & Storage Consultants, Jacksonville
- Moving Companies, Jacksonville
- Moving Services - Labor & Material, Jacksonville
- Moving Truck Rental , Jacksonville
- Muffler Shop & Exhaust Systems, Jacksonville
- Museums, Jacksonville
- Music, Jacksonville
- Music Distribution, Jacksonville
- Musical Instruments & Equipment Stores, Jacksonville
- Musical Recording Services, Jacksonville
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