- Machine Shop & Tool Repair Service, Windsor Locks
- Machine Tools , Windsor Locks
- Machinery, Supplies & Equipment - Business Production Related, Windsor Locks
- Machinery, Supplies & Equipment - Business Supplies Related, Windsor Locks
- Machinery, Supplies & Equipment - Construction & Contractor Related, Windsor Locks
- Mailing, Delivery & Courier Service, Windsor Locks
- Major Appliances, Windsor Locks - Household & Kitchen
- Management Consultants & Services, Windsor Locks
- Manicurists & Pedicurists, Windsor Locks
- Manufacturing, Windsor Locks
- Manufacturing Products, Windsor Locks
- Marble, Windsor Locks
- Marriage & Family Counselors, Windsor Locks
- Masonry Materials & Supplies, Windsor Locks
- Measuring Equipment, Windsor Locks
- Mechanical Engineer, Windsor Locks - Mechanical Engineering Service
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- Merchandise Sales Events, Windsor Locks
- Mexican Restaurants, Windsor Locks
- Mini & Self Storage, Windsor Locks
- Miscellaneous Business Product Repair, Windsor Locks
- Miscellaneous Fabricated Wire Products Manufacturers, Windsor Locks
- Miscellaneous Personal Services, Windsor Locks
- Miscellaneous Photographers, Windsor Locks
- Miscellaneous Professional, Windsor Locks
- Mortgage Bankers & Correspondents, Windsor Locks
- Motor Vehicle, Windsor Locks
- Motor Vehicle Rental & Leasing, Windsor Locks
- Moving Companies, Windsor Locks
- Moving Truck Rental , Windsor Locks
- Muffler Shop & Exhaust Systems, Windsor Locks
- Mulch, Peat & Moss Products, Windsor Locks
- Museums, Windsor Locks
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