- Machine Shop & Tool Repair Service, Winchester
- Machine Tools , Winchester
- Machine Tools Manufacturers Metal Cutting Types, Winchester
- Machinery And Equipment Manufacturers, Winchester
- Machinery, Supplies & Equipment - Business Production Related, Winchester
- Machinery, Supplies & Equipment - Business Supplies Related, Winchester
- Magazine & Newspaper Stands, Winchester - Dealers & Distributors
- Mailing, Delivery & Courier Service, Winchester
- Major Appliances, Winchester - Household & Kitchen
- Management Consultants & Services, Winchester
- Manicurists & Pedicurists, Winchester
- Manufacturing, Winchester
- Manufacturing Products, Winchester
- Manufacturing Services, Winchester
- Market Research & Analysis , Winchester - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Winchester
- Martial Arts & Self Defense Schools, Winchester
- Masonry Contractors, Winchester - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Winchester
- Massage Therapists & Professional, Winchester
- Massage Therapy, Winchester
- Mechanical Contractors, Winchester - Install, Service & Repair
- Medical & Dental Management, Winchester
- Medical Diagnostic Clinics, Winchester - Clinical Labs & Centers
- Medical Management & Business Administration Service, Winchester
- Medical Research, Winchester
- Medical Research & Development, Winchester - Medical Information & Research
- Medical Supplies & Equipment, Winchester
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- Membership Sports & Recreation Clubs, Winchester
- Men's Clothing Stores, Winchester - Clothes & Accessories
- Mental Health Specialists, Winchester - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Finishers, Winchester
- Metal Plating & Polishing, Winchester
- Metaphysical Churches, Winchester
- Methodist Church, Winchester
- Micro Breweries, Winchester
- Miscellaneous Household Item Repair, Winchester
- Miscellaneous Business Services, Winchester
- Miscellaneous Government, Winchester
- Miscellaneous Personal Services, Winchester
- Miscellaneous Photographers, Winchester
- Miscellaneous Professional, Winchester
- Money Counting & Wrapping, Winchester
- Mortgage Bankers & Correspondents, Winchester
- Motion Picture Pre & Post Production Services, Winchester
- Motor Vehicle, Winchester
- Motor Vehicle Rental & Leasing, Winchester
- Moving Companies, Winchester
- Muffler Shop & Exhaust Systems, Winchester
- Music, Winchester
- Music Lessons, Winchester
- Music Lessons - Instrumental, Winchester
- Musical Instrument Rental, Winchester - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Winchester
- Musical Instruments - Guitars, Winchester
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