- Machine Shop, South Sioux City
- Machine Shop & Tool Repair Service, South Sioux City
- Machinery Movers & Erectors, South Sioux City
- Machinery, Supplies & Equipment - Business Production Related, South Sioux City
- Machinery, Supplies & Equipment - Business Supplies Related, South Sioux City
- Machinery, Supplies & Equipment - Construction & Contractor Related, South Sioux City
- Major Appliances, South Sioux City - Household & Kitchen
- Management Consultants & Services, South Sioux City
- Manicurists & Pedicurists, South Sioux City
- Manufacturing, South Sioux City
- Manufacturing Products, South Sioux City
- Maps & Globes, South Sioux City
- Marine Supplies & Equipment, South Sioux City - Boat Supplies
- Marriage & Family Counselors, South Sioux City
- Masonry Contractors, South Sioux City - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, South Sioux City
- Meat Market, Wholesale & Products, South Sioux City
- Mechanical Contractors, South Sioux City - Install, Service & Repair
- Mental Health Specialists, South Sioux City - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, South Sioux City
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- Metals, South Sioux City
- Methodist Church, South Sioux City
- Mexican Food, South Sioux City
- Mexican Restaurants, South Sioux City
- Mini & Self Storage, South Sioux City
- Miscellaneous Business Services, South Sioux City
- Miscellaneous Government, South Sioux City
- Miscellaneous Industry, South Sioux City
- Miscellaneous Personal Services, South Sioux City
- Miscellaneous Photographers, South Sioux City
- Miscellaneous Professional, South Sioux City
- Monuments, Tombstones, Markers & Memorials, South Sioux City
- Mortgage Bankers & Correspondents, South Sioux City
- Motor Vehicle, South Sioux City
- Motor Vehicle Rental & Leasing, South Sioux City
- Motorcycle & Motor Scooters Dealers, Repair & Service, South Sioux City
- Motorcycle Parts, Accessories & Dealers, South Sioux City
- Motorcycle Repair & Service, South Sioux City
- Moving Truck Rental , South Sioux City
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