- Machinery And Equipment Manufacturers, Sheridan
- Machinery, Supplies & Equipment - Business Supplies Related, Sheridan
- Machinery, Supplies & Equipment - Construction & Contractor Related, Sheridan
- Management Consultants & Services, Sheridan
- Manicurists & Pedicurists, Sheridan
- Manufacturing, Sheridan
- Manufacturing Products, Sheridan
- Marriage & Family Counselors, Sheridan
- Masonry Materials & Supplies, Sheridan
- Material Handling & Heavy Machinery & Equipment, Sheridan
- Medical Alert Systems, Sheridan - Medical Alarms - PERS
- Medical Groups & Clinics, Sheridan - Medical & Health Centers
- Medical Supplies & Equipment, Sheridan
- Membership Sports & Recreation Clubs, Sheridan
- Men's & Boys Clothing & Accessories Stores, Sheridan
- Mens & Boys Jeans & Western Wear Stores, Sheridan
- Mental Health Clinics, Sheridan - Treatment Centers
- Mental Health Specialists, Sheridan - Psychologist, Psychiatrist, Psychotherapist, etc
- Merle Norman Cosmetics, Sheridan
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- Metal Buildings, Sheridan - Kits, Homes, Steel Buildings, etc
- Metal Products, Sheridan
- Methodist Church, Sheridan
- Mexican Restaurants, Sheridan
- Mini & Self Storage, Sheridan
- Ministries Church, Sheridan
- Miscellaneous Government, Sheridan
- Miscellaneous Personal Services, Sheridan
- Miscellaneous Photographers, Sheridan
- Miscellaneous Professional, Sheridan
- Mission Churches, Sheridan
- Mobile Home Parks & Communities , Sheridan
- Monuments, Tombstones, Markers & Memorials, Sheridan
- Mortgage Bankers & Correspondents, Sheridan
- Mortgages & Loans, Sheridan
- Motor Vehicle, Sheridan
- Motor Vehicle Rental & Leasing, Sheridan
- Moving Companies, Sheridan
- Moving Truck Rental , Sheridan
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