- Machinery, Supplies & Equipment - Business Production Related, Smithville
- Machinery, Supplies & Equipment - Business Supplies Related, Smithville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Smithville
- Management Consultants & Services, Smithville
- Manicurists & Pedicurists, Smithville
- Manufacturing, Smithville
- Manufacturing Products, Smithville
- Marble, Smithville
- Martial Arts & Self Defense Schools, Smithville
- Masonry Materials & Supplies, Smithville
- Massage Therapists & Professional, Smithville
- Massage Therapy, Smithville
- Meat Packers, Smithville
- Membership Sports & Recreation Clubs, Smithville
- Mens & Womens Clothing, Smithville
- Merchandise Sales Events, Smithville
- Metal Buildings, Smithville - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, Smithville
- Methodist Church, Smithville
- Mini & Self Storage, Smithville
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- Miscellaneous Government, Smithville
- Miscellaneous Industry, Smithville
- Miscellaneous Manufacturing, Smithville
- Miscellaneous Personal Services, Smithville
- Miscellaneous Professional, Smithville
- Modular Buildings, Smithville - Modular Homes Buildings & Offices
- Monuments, Tombstones, Markers & Memorials, Smithville
- Mopeds & Motor Scooters Rental, Smithville
- Motor Vehicle, Smithville
- Motor Vehicle Rental & Leasing, Smithville
- Moving Companies, Smithville
- Moving Truck Rental , Smithville
- Muffler Shop & Exhaust Systems, Smithville
- Music, Smithville
- Music Lessons, Smithville
- Music Lessons - Vocal, Smithville
- Music Production Services, Smithville
- Musical Instruments & Equipment Stores, Smithville
- Musical Recording Services, Smithville
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