- Machine Shop & Tool Repair Service, North Sioux City
- Machinery, Supplies & Equipment - Business Supplies Related, North Sioux City
- Machinery, Supplies & Equipment - Construction & Contractor Related, North Sioux City
- Mammography Clinics, North Sioux City - Breast Cancer Screening
- Management Consultants & Services, North Sioux City
- Manufacturers Agents & Representatives, North Sioux City
- Manufacturers Representative, North Sioux City - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, North Sioux City
- Marine Supplies & Equipment, North Sioux City - Boat Supplies
- Marriage & Family Counselors, North Sioux City
- Mary Kay Cosmetics, North Sioux City
- Massage Therapists & Professional, North Sioux City
- Massage Therapy, North Sioux City
- Medical Diagnostic Clinics, North Sioux City - Clinical Labs & Centers
- Medical Supplies & Equipment, North Sioux City
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- Metal Buildings, North Sioux City - Kits, Homes, Steel Buildings, etc
- Mexican Restaurants, North Sioux City
- Ministries Church, North Sioux City
- Miscellaneous Household Item Repair, North Sioux City
- Miscellaneous Government, North Sioux City
- Miscellaneous Manufacturing, North Sioux City
- Miscellaneous Personal Services, North Sioux City
- Miscellaneous Photographers, North Sioux City
- Miscellaneous Professional, North Sioux City
- Mobile Home Parks & Communities , North Sioux City
- Mortgage Bankers & Correspondents, North Sioux City
- Motor Vehicle, North Sioux City
- Motorcycle Parts, Accessories & Dealers, North Sioux City
- Music Schools, North Sioux City
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