- Machine Shop & Tool Repair Service, Windsor
- Machinery Movers & Erectors, Windsor
- Machinery, Supplies & Equipment - Business Production Related, Windsor
- Machinery, Supplies & Equipment - Business Supplies Related, Windsor
- Machinery, Supplies & Equipment - Construction & Contractor Related, Windsor
- Mailing, Delivery & Courier Service, Windsor
- Manufacturing, Windsor
- Masonry Contractors, Windsor - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Windsor
- Massage Therapists & Professional, Windsor
- Massage Therapy, Windsor
- Meat Market, Wholesale & Products, Windsor
- Medical Supplies & Equipment, Windsor
- Men's Clothing Stores, Windsor - Clothes & Accessories
- Mental Health Clinics, Windsor - Treatment Centers
- Mental Health Specialists, Windsor - Psychologist, Psychiatrist, Psychotherapist, etc
- Mini & Self Storage, Windsor
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- Miscellaneous Agriculture, Windsor
- Miscellaneous Business Services, Windsor
- Miscellaneous Government, Windsor
- Miscellaneous Personal Services, Windsor
- Miscellaneous Professional, Windsor
- Mobile Home Parks & Communities , Windsor
- Monuments, Tombstones, Markers & Memorials, Windsor
- Mortgage Bankers & Correspondents, Windsor
- Mortgage Brokers, Windsor
- Motor Vehicle, Windsor
- Motor Vehicle Rental & Leasing, Windsor
- Motorcycle Parts, Accessories & Dealers, Windsor
- Moving Truck Rental , Windsor
- Museums, Windsor
- Music, Windsor
- Musical Instruments & Equipment Stores, Windsor
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