- Landscape Contractors & Designers, Smithville
- Landscaping, Smithville
- Language Schools, Smithville
- Laundromats & Dry-Cleaning, Coin-Operated, Smithville
- Laundry Self Service, Smithville
- Lawn & Garden Equipment & Supplies, Smithville
- Lawn & Garden Services, Smithville
- Lawn Maintenance Services, Smithville
- Lawyers & Attorneys, Smithville
- Legal Professionals, Smithville
- Libraries, Smithville
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- License & Registry Services, Smithville
- Life Insurance, Smithville
- Liquor Stores, Smithville
- Livestock, Smithville
- Local & Short Haul Trucking Companies, Smithville
- Lodging, Smithville
- Long Haul Trucking Companies, Smithville
- Lumber & Lumber Products, Smithville
- Lumber & Lumber Products, Smithville
- Lumber Companies, Smithville - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Smithville
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