- Machine Shop & Tool Repair Service, Souris
- Machinery, Supplies & Equipment - Business Supplies Related, Souris
- Machinery, Supplies & Equipment - Construction & Contractor Related, Souris
- Magazine & Newspaper Stands, Souris - Dealers & Distributors
- Mail Delivery Service, Souris
- Manufacturing, Souris
- Marinas & Marina Services, Souris
- Marine Supplies & Equipment, Souris - Boat Supplies
- Masonry Materials & Supplies, Souris
- Metal Buildings, Souris - Kits, Homes, Steel Buildings, etc
- Miscellaneous Agriculture, Souris
- Miscellaneous Business Services, Souris
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- Miscellaneous Government, Souris
- Miscellaneous Professional, Souris
- Mobile Home Parks & Communities , Souris
- Monuments, Tombstones, Markers & Memorials, Souris
- Motor Vehicle, Souris
- Motor Vehicle Rental & Leasing, Souris
- Movie Theaters, Souris
- Moving Truck Rental , Souris
- Museums, Souris
- Music, Souris
- Musical Instruments & Equipment Stores, Souris
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