- Management Consultants & Services, Smithville
- Manicurists & Pedicurists, Smithville
- Manufacturing, Smithville
- Manufacturing Products, Smithville
- Martial Arts & Self Defense Schools, Smithville
- Mastectomy Apparel, Forms, Prostheses & Supplies, Smithville
- Mechanical Contractors, Smithville - Install, Service & Repair
- Medical & Dental Management, Smithville
- Medical Management & Business Administration Service, Smithville
- Medical Supplies & Equipment, Smithville
- Methodist Church, Smithville
- Mexican Restaurants, Smithville
- Mining, Smithville
- Miscellaneous Business Product Repair, Smithville
- Miscellaneous Government, Smithville
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- Miscellaneous Personal Services, Smithville
- Miscellaneous Photographers, Smithville
- Miscellaneous Professional, Smithville
- Mortgage Bankers & Correspondents, Smithville
- Motor Vehicle, Smithville
- Motor Vehicle Rental & Leasing, Smithville
- Motorcycle & ATV Repair & Service, Smithville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Smithville
- Motorcycle Parts, Accessories & Dealers, Smithville
- Motorcycle Repair & Service, Smithville
- Moving Truck Rental , Smithville
- Music, Smithville
- Music Lessons, Smithville
- Music Lessons - Instrumental, Smithville
- Musical Instruments & Equipment Stores, Smithville
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