- Machinery And Equipment Manufacturers, Winthrop
- Machinery, Supplies & Equipment - Business Production Related, Winthrop
- Major Appliances, Winthrop - Household & Kitchen
- Management Consultants & Services, Winthrop
- Manicurists & Pedicurists, Winthrop
- Manufacturing, Winthrop
- Marinas & Marina Services, Winthrop
- Marine Contractors & Designers, Winthrop
- Marine Products And Services, Winthrop
- Marine Repair & Service Stations, Winthrop
- Marine Supplies & Equipment, Winthrop - Boat Supplies
- Marine Supplies & Equipment Repair, Winthrop - Boat Supplies & Equipment
- Marriage & Family Counselors, Winthrop
- Martial Arts & Self Defense Schools, Winthrop
- Meat Market, Wholesale & Products, Winthrop
- Medical Supplies & Equipment, Winthrop
- Membership Sports & Recreation Clubs, Winthrop
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- Mental Health Specialists, Winthrop - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Winthrop - Iron Works
- Methodist Church, Winthrop
- Mexican Restaurants, Winthrop
- Miscellaneous Household Item Repair, Winthrop
- Miscellaneous Personal Services, Winthrop
- Miscellaneous Professional, Winthrop
- Mortgage Bankers & Correspondents, Winthrop
- Motion Picture & Television Production Services, Winthrop
- Motor Vehicle, Winthrop
- Moving Companies, Winthrop
- Multimedia Publishers, Winthrop - Multimedia Services & Systems
- Music, Winthrop
- Music Lessons, Winthrop
- Music Lessons - Instrumental, Winthrop
- Music Lessons - Vocal, Winthrop
- Musical Recording Services, Winthrop
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