- Machine Shop, Cleveland
- Machine Shop & Tool Repair Service, Cleveland
- Machinery, Supplies & Equipment - Business Production Related, Cleveland
- Machinery, Supplies & Equipment - Business Supplies Related, Cleveland
- Machinery, Supplies & Equipment - Construction & Contractor Related, Cleveland
- Mail Delivery Service, Cleveland
- Maintenance, Cleaning & Sanitation, Cleveland
- Major Appliances, Cleveland - Household & Kitchen
- Management Consultants & Services, Cleveland
- Manicurists & Pedicurists, Cleveland
- Manufactured & Mobile Home Movers & Transporting, Cleveland
- Manufacturing, Cleveland
- Marriage & Family Counselors, Cleveland
- Martial Arts & Self Defense Schools, Cleveland
- Masonry Contractors, Cleveland - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Cleveland
- Material Handling Equipment, Cleveland - Conveyor Belt, Pallet Jack, Forklift, etc
- Medical Transcription Service, Cleveland
- Membership Sports & Recreation Clubs, Cleveland
- Mental Health Specialists, Cleveland - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Cleveland
- Merchandise Sales Events, Cleveland
- Messenger Service, Cleveland - Message Receiving & Forwarding Service
- Metal Buildings, Cleveland - Wood Buildings
- Metal Buildings, Cleveland - Kits, Homes, Steel Buildings, etc
- Methodist Church, Cleveland
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- Mexican Restaurants, Cleveland
- Millwork Contractors, Cleveland
- Mini & Self Storage, Cleveland
- Mining, Cleveland
- Mining Contractors, Cleveland - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Cleveland - Mining Companies
- Miscellaneous Household Item Repair, Cleveland
- Miscellaneous Business Services, Cleveland
- Miscellaneous Government, Cleveland
- Miscellaneous Industry, Cleveland
- Miscellaneous Personal Services, Cleveland
- Miscellaneous Photographers, Cleveland
- Miscellaneous Professional, Cleveland
- Mission Churches, Cleveland
- Mortgage Bankers & Correspondents, Cleveland
- Mortgage Brokers, Cleveland
- Motivational Speakers & Consultants, Cleveland - Speakers, Lectures & Seminars
- Motor Vehicle, Cleveland
- Motor Vehicle Rental & Leasing, Cleveland
- Motorcycle & ATV Repair & Service, Cleveland
- Motorcycle Repair & Service, Cleveland
- Moving Companies, Cleveland
- Moving Truck Rental , Cleveland
- Muffler Shop & Exhaust Systems, Cleveland
- Music, Cleveland
- Musical Instruments & Equipment Stores, Cleveland
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