- Machine Shop & Tool Repair Service, Keithville
- Machinery Movers & Erectors, Keithville
- Machinery, Supplies & Equipment - Business Production Related, Keithville
- Machinery, Supplies & Equipment - Business Supplies Related, Keithville
- Major Appliances, Keithville - Household & Kitchen
- Management Consultants & Services, Keithville
- Manufacturers Agents & Representatives, Keithville
- Manufacturers Representative, Keithville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Keithville
- Manufacturing Products, Keithville
- Masonry Materials & Supplies, Keithville
- Metal Buildings, Keithville - Kits, Homes, Steel Buildings, etc
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- Methodist Church, Keithville
- Mini & Self Storage, Keithville
- Ministries Church, Keithville
- Miscellaneous Business Services, Keithville
- Miscellaneous Government, Keithville
- Miscellaneous Manufacturing, Keithville
- Mobile Home Parks & Communities , Keithville
- Monuments, Tombstones, Markers & Memorials, Keithville
- Mopeds, Scooter & Mini-Bikes Parts, Accessories & Dealers, Keithville
- Motor Vehicle, Keithville
- Motorcycle Parts, Accessories & Dealers, Keithville
- Moving Companies, Keithville
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