- Machine Shop & Tool Repair Service, Windsor Mill
- Machinery, Supplies & Equipment - Business Production Related, Windsor Mill
- Machinery, Supplies & Equipment - Business Supplies Related, Windsor Mill
- Machinery, Supplies & Equipment - Construction & Contractor Related, Windsor Mill
- Mailing, Delivery & Courier Service, Windsor Mill
- Maintenance, Cleaning & Sanitation, Windsor Mill
- Malls & Shopping Centers, Windsor Mill
- Management Consultants & Services, Windsor Mill
- Manicurists & Pedicurists, Windsor Mill
- Manifold Business Forms Manufacturers, Windsor Mill
- Manufacturing, Windsor Mill
- Manufacturing Equipment & Supplies, Windsor Mill
- Marriage & Family Counselors, Windsor Mill
- Martial Arts & Self Defense Schools, Windsor Mill
- Mechanical Engineer, Windsor Mill - Mechanical Engineering Service
- Medical & Dental Assistant Schools, Windsor Mill
- Medical & Dental Management, Windsor Mill
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Windsor Mill
- Medical Groups & Clinics, Windsor Mill - Medical & Health Centers
- Medical Supplies & Equipment, Windsor Mill
- Men's Clothing Stores, Windsor Mill - Clothes & Accessories
- Mental & Developmental Information & Referral Services, Windsor Mill
- Mental Health Specialists, Windsor Mill - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Windsor Mill
- Metal Tablets, Windsor Mill
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- Methodist Church, Windsor Mill
- Mexican Restaurants, Windsor Mill
- Mini & Self Storage, Windsor Mill
- Ministries Church, Windsor Mill
- Miscellaneous Business Services, Windsor Mill
- Miscellaneous Government, Windsor Mill
- Miscellaneous Manufacturing, Windsor Mill
- Miscellaneous Personal Services, Windsor Mill
- Miscellaneous Photographers, Windsor Mill
- Miscellaneous Professional, Windsor Mill
- Money Counting & Wrapping, Windsor Mill
- Monuments, Tombstones, Markers & Memorials, Windsor Mill
- Mortgage Bankers & Correspondents, Windsor Mill
- Mortgage Contracts & Services, Windsor Mill
- Mortgages & Loans, Windsor Mill
- Mortgages Commercial & Industrial, Windsor Mill
- Motion Picture Pre & Post Production Services, Windsor Mill
- Motor Vehicle, Windsor Mill
- Motor Vehicle Rental & Leasing, Windsor Mill
- Moving Companies, Windsor Mill
- Moving Supplies & Equipment Rental, Windsor Mill
- Moving Truck Rental , Windsor Mill
- Mulch, Peat & Moss Products, Windsor Mill
- Music, Windsor Mill
- Musical Recording Services, Windsor Mill
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