- Machine Shop, Titusville
- Machine Shop & Tool Repair Service, Titusville
- Machinery, Supplies & Equipment - Business Supplies Related, Titusville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Titusville
- Mail Delivery Service, Titusville
- Management Consultants & Services, Titusville
- Manufacturing, Titusville
- Manufacturing Products, Titusville
- Marriage & Family Counselors, Titusville
- Masonry Materials & Supplies, Titusville
- Mechanical Engineer, Titusville - Mechanical Engineering Service
- Medical Supplies & Equipment, Titusville
- Men's Clothing Stores, Titusville - Clothes & Accessories
- Mental Health Clinics, Titusville - Treatment Centers
- Mental Health Specialists, Titusville - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Titusville
- Mexican Restaurants, Titusville
- Milk Bars, Titusville
- Millwrights, Titusville
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- Mining, Titusville
- Miscellaneous Government, Titusville
- Miscellaneous Industry, Titusville
- Miscellaneous Personal Services, Titusville
- Miscellaneous Professional, Titusville
- Mobile Home Parks & Communities , Titusville
- Modular & Mobile Homes For Sale, Titusville - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Titusville
- Mortgage Bankers & Correspondents, Titusville
- Motor Vehicle, Titusville
- Motor Vehicle Rental & Leasing, Titusville
- Motorcycle & ATV Repair & Service, Titusville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Titusville
- Motorcycle Parts, Accessories & Dealers, Titusville
- Motorcycle Repair & Service, Titusville
- Moving Supplies & Equipment Rental, Titusville
- Moving Truck Rental , Titusville
- Muffler Shop & Exhaust Systems, Titusville
- Museums, Titusville
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