- Machine Shop & Tool Repair Service, Sylvania
- Machinery, Supplies & Equipment - Business Supplies Related, Sylvania
- Machinery, Supplies & Equipment - Construction & Contractor Related, Sylvania
- Mail Delivery Service, Sylvania
- Mailing, Delivery & Courier Service, Sylvania
- Management Consultants & Services, Sylvania
- Manicurists & Pedicurists, Sylvania
- Manufacturing, Sylvania
- Marine Products And Services, Sylvania
- Marine Repair & Service Stations, Sylvania
- Marine Services, Sylvania
- Marine Supplies & Equipment, Sylvania - Boat Supplies
- Marine Supplies & Equipment Repair, Sylvania - Boat Supplies & Equipment
- Masonry Contractors, Sylvania - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Sylvania
- Membership Sports & Recreation Clubs, Sylvania
- Mental Health Specialists, Sylvania - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Sylvania
- Merchandise Sales Events, Sylvania
- Metal Buildings, Sylvania - Kits, Homes, Steel Buildings, etc
- Methodist Church, Sylvania
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- Mexican Restaurants, Sylvania
- Mini & Self Storage, Sylvania
- Mining, Sylvania
- Ministries Church, Sylvania
- Miscellaneous Government, Sylvania
- Miscellaneous Industry, Sylvania
- Miscellaneous Personal Services, Sylvania
- Miscellaneous Photographers, Sylvania
- Miscellaneous Professional, Sylvania
- Missing Persons Organizations, Sylvania
- Modular & Mobile Homes For Sale, Sylvania - Manufactured Homes Sale & Service
- Money Transfer Service, Sylvania
- Monuments, Tombstones, Markers & Memorials, Sylvania
- Mortgages & Loans, Sylvania
- Motor Vehicle, Sylvania
- Motor Vehicle Rental & Leasing, Sylvania
- Moving Companies, Sylvania
- Moving Services - Labor & Material, Sylvania
- Moving Supplies & Equipment Rental, Sylvania
- Moving Truck Rental , Sylvania
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