- Machine Shop, Sandusky
- Machine Shop & Tool Repair Service, Sandusky
- Machinery And Equipment Manufacturers, Sandusky
- Machinery Movers & Erectors, Sandusky
- Machinery, Supplies & Equipment - Business Production Related, Sandusky
- Machinery, Supplies & Equipment - Business Supplies Related, Sandusky
- Machinery, Supplies & Equipment - Construction & Contractor Related, Sandusky
- Mailing List Service, Brokers & Compilers, Sandusky
- Mailing, Delivery & Courier Service, Sandusky
- Maintenance, Cleaning & Sanitation, Sandusky
- Major Appliances, Sandusky - Household & Kitchen
- Malls & Shopping Centers, Sandusky
- Management Consultants & Services, Sandusky
- Manicurists & Pedicurists, Sandusky
- Manufacturing, Sandusky
- Manufacturing Products, Sandusky
- Marinas & Marina Services, Sandusky
- Marine Contractors & Designers, Sandusky
- Marine Electronic Equipment, Sandusky
- Marine Products And Services, Sandusky
- Marine Services, Sandusky
- Marine Supplies & Equipment, Sandusky - Boat Supplies
- Marine Surveyors & Adjustors, Sandusky
- Marriage & Family Counselors, Sandusky
- Martial Arts & Self Defense Schools, Sandusky
- Masonry Materials & Supplies, Sandusky
- Massage Therapists & Professional, Sandusky
- Massage Therapy, Sandusky
- Meat Market, Wholesale & Products, Sandusky
- Medical & Dental Assistant Schools, Sandusky
- Medical & Dental Management, Sandusky
- Medical & Health Service Organizations, Sandusky
- Medical Equipment Manufacturers, Sandusky
- Medical Groups & Clinics, Sandusky - Medical & Health Centers
- Medical Supplies & Equipment, Sandusky
- Membership Sports & Recreation Clubs, Sandusky
- Men's Clothing Stores, Sandusky - Clothes & Accessories
- Mental Health Clinics, Sandusky - Treatment Centers
- Mental Health Specialists, Sandusky - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Pricing Equipment, Sandusky
- Metal Plating & Polishing, Sandusky
- Metal Roofs, Sandusky
- Metaphysical Churches, Sandusky
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- Methodist Church, Sandusky
- Mexican Food, Sandusky
- Mexican Restaurants, Sandusky
- Mildew Removal & Control, Sandusky - Mold Removal
- Mini & Self Storage, Sandusky
- Mini Golf Courses, Sandusky
- Miscellaneous Household Item Repair, Sandusky
- Miscellaneous Prosthesis & Appliances, Sandusky
- Miscellaneous Agriculture, Sandusky
- Miscellaneous Business Services, Sandusky
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Sandusky
- Miscellaneous Government, Sandusky
- Miscellaneous Manufacturing, Sandusky
- Miscellaneous Personal Services, Sandusky
- Miscellaneous Photographers, Sandusky
- Miscellaneous Professional, Sandusky
- Mission Churches, Sandusky
- Mobile Home Parks & Communities , Sandusky
- Monuments, Tombstones, Markers & Memorials, Sandusky
- Mortgage Bankers & Correspondents, Sandusky
- Mortgages & Loans, Sandusky
- Motion Picture Pre & Post Production Services, Sandusky
- Motor Vehicle, Sandusky
- Motor Vehicle Rental & Leasing, Sandusky
- Motorcycle & Motor Scooters Dealers, Repair & Service, Sandusky
- Motorcycle Parts, Accessories & Dealers, Sandusky
- Motorcycle Repair & Service, Sandusky
- Movie Theaters, Sandusky
- Moving Companies, Sandusky
- Moving Supplies & Equipment Rental, Sandusky
- Moving Truck Rental , Sandusky
- Mowing Service, Sandusky
- Muffler Shop & Exhaust Systems, Sandusky
- Mulch, Peat & Moss Products, Sandusky
- Museums, Sandusky
- Music, Sandusky
- Music Entertainment, Sandusky
- Music Lessons, Sandusky
- Music Lessons - Instrumental, Sandusky
- Musical Instruments & Equipment Stores, Sandusky
- Musical Instruments Repair, Sales & Service, Sandusky
- Musical Recording Services, Sandusky
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