- Machine Shop & Tool Repair Service, Windsor
- Machinery And Equipment Manufacturers, 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
- Mailbox Rental Services, Windsor
- Mailing, Delivery & Courier Service, Windsor
- Major Appliances, Windsor - Household & Kitchen
- Management Consultants & Services, Windsor
- Manicurists & Pedicurists, Windsor
- Manufacturers Agents & Representatives, Windsor
- Manufacturers Representative, Windsor - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Windsor
- Manufacturing Products, Windsor
- Marketing Consultants Professional Practices, Windsor
- Marriage & Family Counselors, Windsor
- Martial Arts & Self Defense Schools, Windsor
- Mary Kay Cosmetics, Windsor
- Masonry Materials & Supplies, Windsor
- Massage Therapists & Professional, Windsor
- Massage Therapy, Windsor
- Mastectomy Apparel, Forms, Prostheses & Supplies, Windsor
- Material Handling Equipment, Windsor - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Windsor - Maternity Dress, Gown, Swimwear, Underwear & More
- Mechanical Engineer, Windsor - Mechanical Engineering Service
- Medical & Dental Management, Windsor
- Medical Supplies & Equipment, Windsor
- Membership Sports & Recreation Clubs, Windsor
- Mental Health Specialists, Windsor - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Pricing Equipment, Windsor
- Metal Boxes & Containers, Windsor
- Metal Coating & Allied Services, Windsor
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- Metal Finishers, Windsor
- Metal Plating & Polishing, Windsor
- Metal Products, Windsor
- Metal Services, Windsor
- Methodist Church, Windsor
- Mexican Restaurants, Windsor
- Mini & Self Storage, Windsor
- Mining, Windsor
- Miscellaneous Business Product Repair, Windsor
- Miscellaneous Household Item Repair, Windsor
- Miscellaneous Agriculture, Windsor
- Miscellaneous Business Services, Windsor
- Miscellaneous Industry, Windsor
- Miscellaneous Manufacturing, Windsor
- Miscellaneous Personal Services, Windsor
- Miscellaneous Professional, Windsor
- Mobile Home Contractors, Windsor
- Mobile Home Improvements & Repairs, Windsor
- Mortgage Bankers & Correspondents, Windsor
- Mortgage Contracts & Services, Windsor
- Mortgages & Loans, Windsor
- Motor Vehicle, Windsor
- Motor Vehicle Rental & Leasing, Windsor
- Motorcycle Parts, Accessories & Dealers, Windsor
- Movie Theaters, Windsor
- Moving & Storage Supplies & Equipment, Windsor
- Moving Supplies & Equipment Rental, Windsor
- Moving Truck Rental , Windsor
- Muffler Shop & Exhaust Systems, Windsor
- Museums, Windsor
- Music, Windsor
- Musical Instrument Rental, Windsor - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Windsor
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