- Machine Shop & Tool Repair Service, Sidney
- Machinery, Supplies & Equipment - Business Production Related, Sidney
- Machinery, Supplies & Equipment - Business Supplies Related, Sidney
- Machinery, Supplies & Equipment - Construction & Contractor Related, Sidney
- Major Appliances, Sidney - Household & Kitchen
- Management Consultants & Services, Sidney
- Manicurists & Pedicurists, Sidney
- Manifold Business Forms Manufacturers, Sidney
- Manufacturing, Sidney
- Manufacturing Products, Sidney
- Marriage & Family Counselors, Sidney
- Martial Arts & Self Defense Schools, Sidney
- Masonry Materials & Supplies, Sidney
- Massage Therapists & Professional, Sidney
- Massage Therapy, Sidney
- Meat Market, Wholesale & Products, Sidney
- Medical Examiner, Sidney - Doctors, Physicians & Surgeons
- Medical Groups & Clinics, Sidney - Medical & Health Centers
- Membership Sports & Recreation Clubs, Sidney
- Men's & Boys Clothing & Accessories Stores, Sidney
- Mens & Boys Jeans & Western Wear Stores, Sidney
- Mental Health Specialists, Sidney - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Sidney
- Metal Buildings, Sidney - Kits, Homes, Steel Buildings, etc
- Methodist Church, Sidney
- Mexican Restaurants, Sidney
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- Millwork Contractors, Sidney
- Mini & Self Storage, Sidney
- Mining, Sidney
- Mining Consultants, Sidney
- Mining Contractors, Sidney - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Sidney - Mining Companies
- Miscellaneous Fabricated Wire Products Manufacturers, Sidney
- Miscellaneous Agriculture, Sidney
- Miscellaneous Business Services, Sidney
- Miscellaneous Government, Sidney
- Miscellaneous Personal Services, Sidney
- Miscellaneous Photographers, Sidney
- Miscellaneous Professional, Sidney
- Modular & Mobile Homes For Sale, Sidney - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Sidney
- Mortgage Bankers & Correspondents, Sidney
- Mortgages & Loans, Sidney
- Motor Vehicle, Sidney
- Motor Vehicle Rental & Leasing, Sidney
- Motorcycle & ATV Repair & Service, Sidney
- Motorcycle & Motor Scooters Dealers, Repair & Service, Sidney
- Motorcycle Parts, Accessories & Dealers, Sidney
- Motorcycle Repair & Service, Sidney
- Moving Truck Rental , Sidney
- Museums, Sidney
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