- Machine Shop & Tool Repair Service, Worthington
- Machinery, Supplies & Equipment - Business Supplies Related, Worthington
- Machinery, Supplies & Equipment - Construction & Contractor Related, Worthington
- Mailing, Delivery & Courier Service, Worthington
- Major Appliances, Worthington - Household & Kitchen
- Malls & Shopping Centers, Worthington
- Management Consultants & Services, Worthington
- Manicurists & Pedicurists, Worthington
- Manufacturers Agents & Representatives, Worthington
- Manufacturers Representative, Worthington - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Worthington
- Manufacturing Products, Worthington
- Market Research & Analysis , Worthington - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Worthington
- Massage Therapists & Professional, Worthington
- Massage Therapy, Worthington
- Material Handling Equipment, Worthington - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Worthington
- Medical & Dental Management, Worthington
- Medical & Infectious Waste Disposal, Worthington
- Medical Claims Processing & Assistance, Worthington
- Medical Supplies & Equipment, Worthington
- Membership Sports & Recreation Clubs, Worthington
- Mental Health Clinics, Worthington - Treatment Centers
- Mental Health Specialists, Worthington - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Worthington
- Merchandising & Marketing Consultants, Worthington
- Metaphysical Churches, Worthington
- Methodist Church, Worthington
- Mexican Restaurants, Worthington
- Mini & Self Storage, Worthington
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- Mining, Worthington
- Miscellaneous Business Product Repair, Worthington
- Miscellaneous Business Services, Worthington
- Miscellaneous Government, Worthington
- Miscellaneous Manufacturing, Worthington
- Miscellaneous Personal Services, Worthington
- Miscellaneous Photographers, Worthington
- Miscellaneous Professional, Worthington
- Mortgage Bankers & Correspondents, Worthington
- Mortgage Companies, Worthington
- Mortgages & Loans, Worthington
- Motion Picture & Television Production Services, Worthington
- Motor Vehicle, Worthington
- Motor Vehicle Rental & Leasing, Worthington
- Moving & Storage Supplies & Equipment, Worthington
- Moving Companies, Worthington
- Moving Supplies & Equipment Rental, Worthington
- Moving Truck Rental , Worthington
- Museums, Worthington
- Music, Worthington
- Music Entertainment, Worthington
- Music Lessons, Worthington
- Music Lessons - Instrumental, Worthington
- Music Lessons - Vocal, Worthington
- Music Schools, Worthington
- Music Teachers, Worthington
- Musical Instrument Rental, Worthington - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Worthington
- Musical Recording Services, Worthington
- Musicians, Bands & Disc Jockeys, Worthington
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