- Machine Shop & Tool Repair Service, Winfield
- Machinery And Equipment Manufacturers, Winfield
- Machinery, Supplies & Equipment - Business Production Related, Winfield
- Machinery, Supplies & Equipment - Business Supplies Related, Winfield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Winfield
- Maintenance, Cleaning & Sanitation, Winfield
- Major Appliances, Winfield - Household & Kitchen
- Management Consultants & Services, Winfield
- Manicurists & Pedicurists, Winfield
- Manufacturing, Winfield
- Manufacturing Products, Winfield
- Marriage & Family Counselors, Winfield
- Masonry Materials & Supplies, Winfield
- Massage Therapists & Professional, Winfield
- Massage Therapy, Winfield
- Meat Market, Wholesale & Products, Winfield
- Medical Diagnostic Clinics, Winfield - Clinical Labs & Centers
- Medical Supplies & Equipment, Winfield
- Membership Sports & Recreation Clubs, Winfield
- Mental Health Clinics, Winfield - Treatment Centers
- Merchandise Sales Events, Winfield
- Metal Buildings, Winfield - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Winfield - Iron Works
- Methodist Church, Winfield
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- Mexican Food, Winfield
- Mexican Restaurants, Winfield
- Midwives, Winfield
- Mildew Removal & Control, Winfield - Mold Removal
- Mini & Self Storage, Winfield
- Mining, Winfield
- Miscellaneous Business Services, Winfield
- Miscellaneous Government, Winfield
- Miscellaneous Motor Vehicles, Winfield
- Miscellaneous Personal Services, Winfield
- Miscellaneous Photographers, Winfield
- Miscellaneous Professional, Winfield
- Money Change Machines, Winfield
- Monuments, Tombstones, Markers & Memorials, Winfield
- Motor Vehicle, Winfield
- Motor Vehicle Rental & Leasing, Winfield
- Motorcycle & ATV Repair & Service, Winfield
- Motorcycle & Motor Scooters Dealers, Repair & Service, Winfield
- Motorcycle Parts, Accessories & Dealers, Winfield
- Motorcycle Repair & Service, Winfield
- Movie Theaters, Winfield
- Moving Truck Rental , Winfield
- Museums, Winfield
- Musical Instruments Repair, Sales & Service, Winfield
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