- Lake Resorts, Houston
- Laundromats & Dry-Cleaning, Coin-Operated, Houston
- Laundry Self Service, Houston
- Lawn & Garden Equipment & Supplies, Houston
- Lawn Mowers & Power Equipment, Houston
- Lawyers & Attorneys, Houston
- Legal & Tax Services, Houston
- Legal Professionals, Houston
- Libraries, Houston
- Life Insurance, Houston
- Linen Supply Services, Houston
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- Liquor Stores, Houston
- Livestock, Houston
- Loans Personal, Houston
- Lodging, Houston
- Loggers, Houston
- Logging Contractors & Supplies, Houston
- Long Haul Trucking Companies, Houston
- Lottery Game Retailers, Houston
- Lumber & Wood Products Manufacturers, Houston
- Lumber Companies, Houston - Wholesale, Manufacturers & Suppliers
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