- Machine Shop, Worthington
- Machine Shop & Tool Repair Service, Worthington
- Machinery, Supplies & Equipment - Business Production Related, Worthington
- Machinery, Supplies & Equipment - Business Supplies Related, Worthington
- Machinery, Supplies & Equipment - Construction & Contractor Related, Worthington
- Mail Delivery Service, Worthington
- Major Appliances, Worthington - Household & Kitchen
- Malls & Shopping Centers, Worthington
- Manicurists & Pedicurists, Worthington
- Manufacturing, Worthington
- Manufacturing Products, Worthington
- Marriage & Family Counselors, Worthington
- Masonry Materials & Supplies, Worthington
- Massage Therapy, Worthington
- Maternity Clothes & Clothing Stores, Worthington - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, Worthington
- Meat Packers, Worthington
- Medical & Health Service Organizations, Worthington
- Medical Equipment Manufacturers, Worthington
- Medical Groups & Clinics, Worthington - Medical & Health Centers
- Medical Supplies & Equipment, Worthington
- Membership Sports & Recreation Clubs, Worthington
- Men's Clothing Stores, Worthington - Clothes & Accessories
- Mental Health Clinics, Worthington - Treatment Centers
- Mental Health Specialists, Worthington - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Worthington
- Methodist Church, Worthington
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- Mexican Food, Worthington
- Mexican Restaurants, Worthington
- Mining, Worthington
- Miscellaneous Government, Worthington
- Miscellaneous Industry, Worthington
- Miscellaneous Manufacturing, Worthington
- Miscellaneous Photographers, Worthington
- Miscellaneous Professional, Worthington
- Mission Churches, Worthington
- Mobile Home Parks & Communities , Worthington
- Modular Buildings, Worthington - Modular Homes Buildings & Offices
- Monuments, Tombstones, Markers & Memorials, Worthington
- Mortgage Bankers & Correspondents, Worthington
- Mortgage Contracts & Services, Worthington
- Mortgages & Loans, Worthington
- Motion Picture & Television Production Services, Worthington
- Motor Vehicle, Worthington
- Motor Vehicle Rental & Leasing, Worthington
- Movie Theaters, Worthington
- Moving Companies, Worthington
- Moving Truck Rental , Worthington
- Muffler Shop & Exhaust Systems, Worthington
- Museums, Worthington
- Music, Worthington
- Musical Instrument Rental, Worthington - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Worthington
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