- Machine Shop & Tool Repair Service, Decorah
- Machinery And Equipment Manufacturers, Decorah
- Machinery Repair & Rebuild, Decorah
- Machinery, Supplies & Equipment - Business Production Related, Decorah
- Machinery, Supplies & Equipment - Business Supplies Related, Decorah
- Machinery, Supplies & Equipment - Construction & Contractor Related, Decorah
- Mail Delivery Service, Decorah
- Major Appliances, Decorah - Household & Kitchen
- Management Consultants & Services, Decorah
- Manicurists & Pedicurists, Decorah
- Manufacturing, Decorah
- Marriage & Family Counselors, Decorah
- Masonry Materials & Supplies, Decorah
- Massage Therapists & Professional, Decorah
- Massage Therapy, Decorah
- Meat Market, Wholesale & Products, Decorah
- Mechanical Engineer, Decorah - Mechanical Engineering Service
- Medical Supplies & Equipment, Decorah
- Membership Sports & Recreation Clubs, Decorah
- Men's Clothing Stores, Decorah - Clothes & Accessories
- Mental & Developmental Information & Referral Services, Decorah
- Mental Health Specialists, Decorah - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merchandise Sales Events, Decorah
- Methodist Church, Decorah
- Mexican Restaurants, Decorah
- Miscellaneous Agriculture, Decorah
- Miscellaneous Business Services, Decorah
- Miscellaneous Government, Decorah
- Miscellaneous Personal Services, Decorah
- Miscellaneous Photographers, Decorah
- Miscellaneous Professional, Decorah
- Monuments, Tombstones, Markers & Memorials, Decorah
- Mortgage Bankers & Correspondents, Decorah
- Mortgage Contracts & Services, Decorah
- Motion Picture Pre & Post Production Services, Decorah
- Motor Vehicle, Decorah
- Motor Vehicle Rental & Leasing, Decorah
- Motorcycle Parts, Accessories & Dealers, Decorah
- Moving Companies, Decorah
- Moving Truck Rental , Decorah
- Museums, Decorah
- Music, Decorah
- Musical Instrument Rental, Decorah - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Decorah
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