- Machine Shop, Sheridan
- Machine Shop & Tool Repair Service, Sheridan
- Machinery, Supplies & Equipment - Business Production Related, Sheridan
- Machinery, Supplies & Equipment - Business Supplies Related, Sheridan
- Machinery, Supplies & Equipment - Construction & Contractor Related, Sheridan
- Mailbox Rental Services, Sheridan
- Mailing, Delivery & Courier Service, Sheridan
- Major Appliances, Sheridan - Household & Kitchen
- Malls & Shopping Centers, Sheridan
- Management Consultants & Services, Sheridan
- Manicurists & Pedicurists, Sheridan
- Manifold Business Forms Manufacturers, Sheridan
- Manufactured & Mobile Home Movers & Transporting, Sheridan
- Manufacturing, Sheridan
- Manufacturing Equipment & Supplies, Sheridan
- Manufacturing Products, Sheridan
- Marine Contractors & Designers, Sheridan
- Marriage & Family Counselors, Sheridan
- Martial Arts & Self Defense Schools, Sheridan
- Masonry Contractors, Sheridan - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Sheridan
- Mass Transit Vehicle Dealers, Sheridan
- Massage Therapists & Professional, Sheridan
- Massage Therapy, Sheridan
- Meat Market, Wholesale & Products, Sheridan
- Medical & Dental Management, Sheridan
- Medical Diagnostic Clinics, Sheridan - Clinical Labs & Centers
- Medical Groups & Clinics, Sheridan - Medical & Health Centers
- Medical Management & Business Administration Service, Sheridan
- Medical Supplies & Equipment, Sheridan
- Meeting & Event Planning Services, Sheridan - Conference Consultants
- Membership Sports & Recreation Clubs, Sheridan
- Men's & Boys Clothing & Accessories Stores, Sheridan
- Men's Clothing Stores, Sheridan - Clothes & Accessories
- Mens & Boys Jeans & Western Wear Stores, Sheridan
- Mental Health Clinics, Sheridan - Treatment Centers
- Mental Health Specialists, Sheridan - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Sheridan - Kits, Homes, Steel Buildings, etc
- Metal Plating & Polishing, Sheridan
- Metal Repair Service & Blacksmith, Sheridan - Iron Works
- Methodist Church, Sheridan
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- Mexican Restaurants, Sheridan
- Mini & Self Storage, Sheridan
- Mining, Sheridan
- Mining Contractors, Sheridan - Mining Companies, Contractors & Brokers
- Mining Equipment & Supplies, Sheridan
- Mining, Crude-Oil Production, Sheridan - Mining Companies
- Miscellaneous Business Product Repair, Sheridan
- Miscellaneous Agriculture, Sheridan
- Miscellaneous Business Services, Sheridan
- Miscellaneous Government, Sheridan
- Miscellaneous Industry, Sheridan
- Miscellaneous Manufacturing, Sheridan
- Miscellaneous Personal Services, Sheridan
- Miscellaneous Photographers, Sheridan
- Miscellaneous Professional, Sheridan
- Mobile Home Contractors, Sheridan
- Mobile Home Improvements & Repairs, Sheridan
- Mobile Home Parks & Communities , Sheridan
- Modular & Mobile Homes For Sale, Sheridan - Manufactured Homes Sale & Service
- Money Transfer Service, Sheridan
- Monuments, Tombstones, Markers & Memorials, Sheridan
- Mortgage Bankers & Correspondents, Sheridan
- Mortgage Brokers, Sheridan
- Mortgage Companies, Sheridan
- Mortgage Contracts & Services, Sheridan
- Mortgage Feasibility Consultants, Sheridan
- Mortgages & Loans, Sheridan
- Motion Picture Pre & Post Production Services, Sheridan
- Motor Vehicle, Sheridan
- Motor Vehicle Rental & Leasing, Sheridan
- Motorcycle Parts, Accessories & Dealers, Sheridan
- Movie Theaters, Sheridan
- Moving & Storage Supplies & Equipment, Sheridan
- Moving Companies, Sheridan
- Moving Truck Rental , Sheridan
- Muffler Shop & Exhaust Systems, Sheridan
- Museums, Sheridan
- Music, Sheridan
- Musical Instrument Rental, Sheridan - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Sheridan
- Musical Instruments Repair, Sales & Service, Sheridan
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