- Mail Delivery Service, Oberlin
- Major Appliances, Oberlin - Household & Kitchen
- Management Consultants & Services, Oberlin
- Manufacturing, Oberlin
- Marriage & Family Counselors, Oberlin
- Masonry Materials & Supplies, Oberlin
- Merchandise Sales Events, Oberlin
- Metal Buildings, Oberlin - Wood Buildings
- Methodist Church, Oberlin
- Miscellaneous Government, Oberlin
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- Mortgage Bankers & Correspondents, Oberlin
- Motor Vehicle, Oberlin
- Motor Vehicle Rental & Leasing, Oberlin
- Motorcycle Parts, Accessories & Dealers, Oberlin
- Motorcycle Repair & Service, Oberlin
- Movie Theaters, Oberlin
- Moving Supplies & Equipment Rental, Oberlin
- Moving Truck Rental , Oberlin
- Mowers & Tractors, Oberlin
- Museums, Oberlin
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