- Laboratories Medical, Rio Grande City
- Laboratories X-Ray, Rio Grande City
- Land Planning Services, Rio Grande City
- Land Surveyor, Rio Grande City - Land Surveying Services
- Landscaping, Rio Grande City
- Late Night Restaurants, Rio Grande City
- Lawn Mower Repair & Blade Sharpening Service, Rio Grande City
- Lawyers & Attorneys, Rio Grande City
- Legal Professionals, Rio Grande City
- Life Insurance, Rio Grande City
- Liquor & Beer Manufacturers, Rio Grande City
- Liquor Stores, Rio Grande City
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- Livestock, Rio Grande City
- Livestock Consultants, Rio Grande City
- Loans Check Cashing, Rio Grande City
- Loans Personal, Rio Grande City
- Loans Title Services, Rio Grande City
- Local & Short Haul Trucking Companies, Rio Grande City
- Lodging, Rio Grande City
- Lodging Services, Rio Grande City
- Long Haul Trucking Companies, Rio Grande City
- Lumber & Lumber Products, Rio Grande City
- Lumber & Lumber Products, Rio Grande City
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