- Machine Shop & Tool Repair Service, Sidney
- Machine Tool Repair & Rebuild, Sidney
- Machinery And Equipment 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
- Mailing, Delivery & Courier Service, Sidney
- Major Appliances, Sidney - Household & Kitchen
- Management Consultants & Services, Sidney
- Management Training & Development, Sidney
- Manicurists & Pedicurists, Sidney
- Manufactured & Mobile Home Movers & Transporting, Sidney
- Manufacturing, Sidney
- Manufacturing Products, Sidney
- Marble, Sidney
- Marinas & Marina Services, Sidney
- Marine Electronic Equipment, Sidney
- Marine Lifts, Launching & Recovery, Sidney
- Marine Products And Services, Sidney
- Marine Repair & Service Stations, Sidney
- Marine Resource Consultants, Sidney
- Marine Supplies & Equipment, Sidney - Boat Supplies
- Marine Supplies & Equipment Repair, Sidney - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Sidney
- Masonry Contractors, Sidney - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Sidney
- Massage Parlor & Steam Bath Services, Sidney
- Massage Therapists & Professional, Sidney
- Massage Therapy, Sidney
- Maternity Clothes & Clothing Stores, Sidney - Maternity Dress, Gown, Swimwear, Underwear & More
- Medical Equipment & Supplies Rental & Leasing, Sidney
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- Medical Research Facilities, Sidney - Research & Development Centers
- Medical Supplies & Equipment, Sidney
- Membership Sports & Recreation Clubs, Sidney
- Men's & Boys Clothing & Accessories Stores, Sidney
- Men's Clothing Stores, Sidney - Clothes & Accessories
- Mens & Boys Belts & Suspenders, Sidney
- Mental Health Specialists, Sidney - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Plating & Polishing, Sidney
- Metal Repair Service & Blacksmith, Sidney - Iron Works
- Metal Specialties, Sidney
- Millwork Contractors, Sidney
- Mini & Self Storage, Sidney
- Mining Equipment & Supplies, Sidney
- Miscellaneous Business Product Repair, Sidney
- Miscellaneous Agriculture, Sidney
- Miscellaneous Manufacturing, Sidney
- Miscellaneous Personal Services, Sidney
- Miscellaneous Professional, Sidney
- Mortgage Bankers & Correspondents, Sidney
- Motion Picture & Television Production Services, Sidney
- Motion Picture Dists & Producers, Sidney
- Motor Vehicle, Sidney
- Motor Vehicle Rental & Leasing, Sidney
- Motorcycle Parts, Accessories & Dealers, Sidney
- Movie Theaters, Sidney
- Moving Companies, Sidney
- Muffler Shop & Exhaust Systems, Sidney
- Museums, Sidney
- Music, Sidney
- Music Lessons, Sidney
- Music Lessons - Instrumental, Sidney
- Musical Instruments & Equipment Stores, Sidney
- Musical Instruments Repair, Sales & Service, Sidney
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