- Machine Shop & Tool Repair Service, Marshfield
- Machinery And Equipment Manufacturers, Marshfield
- Machinery, Supplies & Equipment - Business Production Related, Marshfield
- Machinery, Supplies & Equipment - Business Supplies Related, Marshfield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Marshfield
- Major Appliances, Marshfield - Household & Kitchen
- Malls & Shopping Centers, Marshfield
- Management Consultants & Services, Marshfield
- Manicurists & Pedicurists, Marshfield
- Manufacturing, Marshfield
- Manufacturing Products, Marshfield
- Marriage & Family Counselors, Marshfield
- Martial Arts & Self Defense Schools, Marshfield
- Masonry Materials & Supplies, Marshfield
- Massage Therapists & Professional, Marshfield
- Massage Therapy, Marshfield
- Material Handling Equipment, Marshfield - Conveyor Belt, Pallet Jack, Forklift, etc
- Maytag Appliances, Marshfield
- Meat Market, Wholesale & Products, Marshfield
- Medical & Dental Management, Marshfield
- Medical & Health Service Organizations, Marshfield
- Medical Groups & Clinics, Marshfield - Medical & Health Centers
- Medical Supplies & Equipment, Marshfield
- Meeting & Event Planning Services, Marshfield - Conference Consultants
- Membership Sports & Recreation Clubs, Marshfield
- Mental Health Clinics, Marshfield - Treatment Centers
- Mental Health Specialists, Marshfield - Psychologist, Psychiatrist, Psychotherapist, etc
- Merle Norman Cosmetics, Marshfield
- Metal Repair Service & Blacksmith, Marshfield - Iron Works
- Metal Working Machinery, Marshfield
- Methodist Church, Marshfield
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- Mexican Food & Goods Products, Marshfield
- Mexican Restaurants, Marshfield
- Mini & Self Storage, Marshfield
- Mining, Marshfield
- Miscellaneous Prosthesis & Appliances, Marshfield
- Miscellaneous Agriculture, Marshfield
- Miscellaneous Business Services, Marshfield
- Miscellaneous Government, Marshfield
- Miscellaneous Industry, Marshfield
- Miscellaneous Manufacturing, Marshfield
- Miscellaneous Personal Services, Marshfield
- Miscellaneous Photographers, Marshfield
- Miscellaneous Professional, Marshfield
- Mobile Home Parks & Communities , Marshfield
- Moldings Materials, Marshfield
- Monuments, Tombstones, Markers & Memorials, Marshfield
- Mortgage Bankers & Correspondents, Marshfield
- Motion Picture Pre & Post Production Services, Marshfield
- Motor Vehicle, Marshfield
- Motor Vehicle Rental & Leasing, Marshfield
- Motorcycle Parts, Accessories & Dealers, Marshfield
- Movie Theaters, Marshfield
- Moving Companies, Marshfield
- Moving Supplies & Equipment Rental, Marshfield
- Moving Truck Rental , Marshfield
- Muffler Shop & Exhaust Systems, Marshfield
- Museums, Marshfield
- Music, Marshfield
- Musical Instrument Rental, Marshfield - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Marshfield
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