- Machinery And Equipment Manufacturers, Royston
- Machinery, Supplies & Equipment - Business Supplies Related, Royston
- Machinery, Supplies & Equipment - Construction & Contractor Related, Royston
- Major Appliances, Royston - Household & Kitchen
- Manicurists & Pedicurists, Royston
- Manufacturing, Royston
- Marriage & Family Counselors, Royston
- Masonry Materials & Supplies, Royston
- Medical Supplies & Equipment, Royston
- Men's & Boys Clothing & Accessories Stores, Royston
- Mens & Boys Jeans & Western Wear Stores, Royston
- Mental Health Specialists, Royston - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merle Norman Cosmetics, Royston
- Methodist Church, Royston
- Miscellaneous Government, Royston
- Miscellaneous Personal Services, Royston
- Mortgage Bankers & Correspondents, Royston
- Motor Vehicle, Royston
- Motor Vehicle Rental & Leasing, Royston
- Movie Theaters, Royston
- Moving Truck Rental , Royston
- Muffler Shop & Exhaust Systems, Royston
- Museums, Royston
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