- Machine Shop, Marshalltown
- Machine Shop & Tool Repair Service, Marshalltown
- Machinery And Equipment Manufacturers, Marshalltown
- Machinery Movers & Erectors, Marshalltown
- Machinery, Supplies & Equipment - Business Production Related, Marshalltown
- Machinery, Supplies & Equipment - Business Supplies Related, Marshalltown
- Machinery, Supplies & Equipment - Construction & Contractor Related, Marshalltown
- Mailbox Rental Services, Marshalltown
- Mailing, Delivery & Courier Service, Marshalltown
- Major Appliances, Marshalltown - Household & Kitchen
- Malls & Shopping Centers, Marshalltown
- Management Consultants & Services, Marshalltown
- Manicurists & Pedicurists, Marshalltown
- Manufacturing, Marshalltown
- Manufacturing Products, Marshalltown
- Marriage & Family Counselors, Marshalltown
- Masonry Contractors, Marshalltown - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Marshalltown
- Mass Transit Vehicle Dealers, Marshalltown
- Massage Therapists & Professional, Marshalltown
- Massage Therapy, Marshalltown
- Mats & Matting, Marshalltown
- Meat Market, Wholesale & Products, Marshalltown
- Meat Packers, Marshalltown
- Medical Supplies & Equipment, Marshalltown
- Mental & Developmental Information & Referral Services, Marshalltown
- Mental Health Specialists, Marshalltown - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Marshalltown
- Metal Buildings, Marshalltown - Wood Buildings
- Metal Buildings, Marshalltown - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Marshalltown - Iron Works
- Metal Working Machinery, Marshalltown
- Methodist Church, Marshalltown
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- Mexican Restaurants, Marshalltown
- Mining, Marshalltown
- Miscellaneous Government, Marshalltown
- Miscellaneous Personal Services, Marshalltown
- Miscellaneous Photographers, Marshalltown
- Miscellaneous Professional, Marshalltown
- Mobile Home Parks & Communities , Marshalltown
- Modular Buildings, Marshalltown - Modular Homes Buildings & Offices
- Moldings Materials, Marshalltown
- Money Transfer Service, Marshalltown
- Monuments, Tombstones, Markers & Memorials, Marshalltown
- Mortgage Bankers & Correspondents, Marshalltown
- Mortgage Contracts & Services, Marshalltown
- Mortgage Feasibility Consultants, Marshalltown
- Mortgages & Loans, Marshalltown
- Motion Picture Pre & Post Production Services, Marshalltown
- Motor Vehicle, Marshalltown
- Motor Vehicle Rental & Leasing, Marshalltown
- Motorcycle & ATV Repair & Service, Marshalltown
- Motorcycle & Motor Scooters Dealers, Repair & Service, Marshalltown
- Motorcycle Parts, Accessories & Dealers, Marshalltown
- Motorcycle Repair & Service, Marshalltown
- Movie Theaters, Marshalltown
- Moving & Storage Supplies & Equipment, Marshalltown
- Moving Truck Rental , Marshalltown
- Muffler Shop & Exhaust Systems, Marshalltown
- Museums, Marshalltown
- Music, Marshalltown
- Music Schools, Marshalltown
- Musical Instrument Rental, Marshalltown - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Marshalltown
- Musical Instruments - Guitars, Marshalltown
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