- Machine Shop & Tool Repair Service, Port Clinton
- Machinery, Supplies & Equipment - Business Production Related, Port Clinton
- Machinery, Supplies & Equipment - Business Supplies Related, Port Clinton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Port Clinton
- Magazine & Newspaper Stands, Port Clinton - Dealers & Distributors
- Major Appliances, Port Clinton - Household & Kitchen
- Management Consultants & Services, Port Clinton
- Manicurists & Pedicurists, Port Clinton
- Manufacturing, Port Clinton
- Marinas & Marina Services, Port Clinton
- Marine Contractors & Designers, Port Clinton
- Marine Electronic Equipment, Port Clinton
- Marine Engineers, Port Clinton
- Marine Products And Services, Port Clinton
- Marine Repair & Service Stations, Port Clinton
- Marine Supplies & Equipment, Port Clinton - Boat Supplies
- Marine Supplies & Equipment Repair, Port Clinton - Boat Supplies & Equipment
- Marriage & Family Counselors, Port Clinton
- Masonry Contractors, Port Clinton - Stone Mason, Brick Mason - Install & Repair
- Membership Sports & Recreation Clubs, Port Clinton
- Mental Health Specialists, Port Clinton - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Port Clinton
- Metal Buildings, Port Clinton - Kits, Homes, Steel Buildings, etc
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- Methodist Church, Port Clinton
- Mexican Restaurants, Port Clinton
- Midwives, Port Clinton
- Mini Golf Courses, Port Clinton
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Port Clinton
- Miscellaneous Government, Port Clinton
- Miscellaneous Industry, Port Clinton
- Miscellaneous Personal Services, Port Clinton
- Miscellaneous Professional, Port Clinton
- Mobile Home Parks & Communities , Port Clinton
- Mortgage Bankers & Correspondents, Port Clinton
- Mortgage Brokers, Port Clinton
- Mortgage Companies, Port Clinton
- Mortgage Loan Processors, Port Clinton
- Mortgages & Loans, Port Clinton
- Motor Vehicle, Port Clinton
- Motor Vehicle Rental & Leasing, Port Clinton
- Motorcycle Parts, Accessories & Dealers, Port Clinton
- Moving Supplies & Equipment Rental, Port Clinton
- Moving Truck Rental , Port Clinton
- Muffler Shop & Exhaust Systems, Port Clinton
- Museums, Port Clinton
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