- Land Surveyor, Houston - Land Surveying Services
- Laundromats & Dry-Cleaning, Coin-Operated, Houston
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Houston
- Lawn Mower Repair & Blade Sharpening Service, Houston
- Lawyers & Attorneys, Houston
- Legal Professionals, Houston
- Libraries, Houston
- License Services, Houston
- Life Insurance, Houston
- Lime & Limestone, Houston
- Liquor Stores, Houston
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- Livestock, Houston
- Loans Check Cashing, Houston
- Loans Personal, Houston
- Local & Short Haul Trucking Companies, Houston
- Lodging, Houston
- Long Haul Trucking Companies, Houston
- Lumber & Lumber Products, Houston
- Lumber & Lumber Products, Houston
- Lumber & Wood Products Manufacturers, Houston
- Lumber Treating & Drying, Houston
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