- Machine Shop & Tool Repair Service, Sidney
- Machine Tools , Sidney
- Machinery And Equipment Manufacturers, Sidney
- Machinery Custom Design Manufacturers, Sidney
- Machinery Movers & Erectors, Sidney
- Machinery Repair & Rebuild, Sidney
- Machinery, Supplies & Equipment - Business Production Related, Sidney
- Machinery, Supplies & Equipment - Business Supplies Related, Sidney
- Machinery, Supplies & Equipment - Construction & Contractor Related, Sidney
- Magazine & Newspaper Stands, Sidney - Dealers & Distributors
- Mailbox Rental Services, Sidney
- Mailing, Delivery & Courier Service, Sidney
- Major Appliances, Sidney - Household & Kitchen
- Management Consultants & Services, Sidney
- Manicurists & Pedicurists, Sidney
- Manifold Business Forms Manufacturers, Sidney
- Manufacturers Agents & Representatives, Sidney
- Manufacturers Representative, Sidney - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Sidney
- Manufacturing & Industrial Consultants, Sidney
- Manufacturing Products, Sidney
- Marriage & Family Counselors, Sidney
- Masonry Contractors, Sidney - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Sidney
- Massage Therapists & Professional, Sidney
- Massage Therapy, Sidney
- Material Handling Equipment, Sidney - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Sidney
- Mechanical Contractors, Sidney - Install, Service & Repair
- Medical Massage, Sidney
- Medical Supplies & Equipment, Sidney
- Membership Sports & Recreation Clubs, Sidney
- Men's Clothing Stores, Sidney - Clothes & Accessories
- Mental Health Specialists, Sidney - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Sidney
- Metal Finishers, Sidney
- Metal Pigment & Paint Products, Sidney
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- Metal Plating & Polishing, Sidney
- Metal Working Machinery, Sidney
- Methodist Church, Sidney
- Mexican & Latin American Goods & Products Stores, Sidney
- Mexican Restaurants, Sidney
- Mini & Self Storage, Sidney
- Mirrors, Sidney - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Sidney
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Sidney
- Miscellaneous Government, Sidney
- Miscellaneous Manufacturing, Sidney
- Miscellaneous Personal Services, Sidney
- Miscellaneous Photographers, Sidney
- Miscellaneous Professional, Sidney
- Mission Churches, Sidney
- Mobile Home Parks & Communities , Sidney
- Modular & Mobile Homes For Sale, Sidney - Manufactured Homes Sale & Service
- Money Transfer Service, Sidney
- Monuments, Tombstones, Markers & Memorials, Sidney
- Mortgage Bankers & Correspondents, Sidney
- Mortgage Companies, Sidney
- Mortgages & Loans, Sidney
- Motion Picture Pre & Post Production Services, Sidney
- Motor Vehicle, Sidney
- Motor Vehicle Rental & Leasing, Sidney
- Motorcycle Parts, Accessories & Dealers, Sidney
- Movie Theaters, Sidney
- Moving & Storage Supplies & Equipment, Sidney
- Moving Companies, Sidney
- Moving Services - Labor & Material, Sidney
- Moving Supplies & Equipment Rental, Sidney
- Moving Truck Rental , Sidney
- Multimedia Publishers, Sidney - Multimedia Services & Systems
- Music, Sidney
- Musical Instrument Rental, Sidney - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Sidney
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