- Machine Shop & Tool Repair Service, Smithville
- Machinery, Supplies & Equipment - Business Production Related, Smithville
- Machinery, Supplies & Equipment - Business Supplies Related, Smithville
- Major Appliances, Smithville - Household & Kitchen
- Management Consultants & Services, Smithville
- Manufacturers Agents & Representatives, Smithville
- Manufacturers Representative, Smithville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Smithville
- Marinas & Marina Services, Smithville
- Marriage & Family Counselors, Smithville
- Masonry Materials & Supplies, Smithville
- Medical & Dental Management, Smithville
- Medical Supplies & Equipment, Smithville
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- Mennonite Church, Smithville
- Methodist Church, Smithville
- Mexican Restaurants, Smithville
- Miscellaneous Government, Smithville
- Miscellaneous Manufacturing, Smithville
- Miscellaneous Personal Services, Smithville
- Miscellaneous Professional, Smithville
- Monuments, Tombstones, Markers & Memorials, Smithville
- Mortgage Bankers & Correspondents, Smithville
- Motor Vehicle, Smithville
- Motor Vehicle Rental & Leasing, Smithville
- Moving Companies, Smithville
- Moving Truck Rental , Smithville
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