- Machine Shop, Wadena
- Machine Shop & Tool Repair Service, Wadena
- Machinery, Supplies & Equipment - Business Production Related, Wadena
- Machinery, Supplies & Equipment - Construction & Contractor Related, Wadena
- Major Appliances, Wadena - Household & Kitchen
- Management Consultants & Services, Wadena
- Manufacturing, Wadena
- Marriage & Family Counselors, Wadena
- Martial Arts & Self Defense Schools, Wadena
- Masonry Materials & Supplies, Wadena
- Massage Therapists & Professional, Wadena
- Massage Therapy, Wadena
- Medical Supplies & Equipment, Wadena
- Membership Sports & Recreation Clubs, Wadena
- Methodist Church, Wadena
- Mexican Restaurants, Wadena
- Miscellaneous Business Services, Wadena
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- Miscellaneous Government, Wadena
- Miscellaneous Industry, Wadena
- Miscellaneous Personal Services, Wadena
- Miscellaneous Photographers, Wadena
- Miscellaneous Professional, Wadena
- Mortgage Bankers & Correspondents, Wadena
- Mortgage Contracts & Services, Wadena
- Motor Vehicle, Wadena
- Motor Vehicle Rental & Leasing, Wadena
- Motorcycle & ATV Repair & Service, Wadena
- Motorcycle & Motor Scooters Dealers, Repair & Service, Wadena
- Motorcycle Repair & Service, Wadena
- Movie Theaters, Wadena
- Moving Companies, Wadena
- Moving Supplies & Equipment Rental, Wadena
- Moving Truck Rental , Wadena
- Museums, Wadena
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