- Labor & Employment Consultants, Port Arthur
- Labor Organizations, Port Arthur
- Laboratories Medical, Port Arthur
- Land Surveyor, Port Arthur - Land Surveying Services
- Landscape Contractors & Designers, Port Arthur
- Landscaping, Port Arthur
- Late Night Restaurants, Port Arthur
- Laundromats & Dry-Cleaning, Coin-Operated, Port Arthur
- Laundry Self Service, Port Arthur
- Lawn & Garden Equipment & Supplies, Port Arthur
- Lawn & Garden Services, Port Arthur
- Lawn Maintenance Services, Port Arthur
- Lawn Mower Repair & Blade Sharpening Service, Port Arthur
- Lawyers & Attorneys, Port Arthur
- Legal & Tax Services, Port Arthur
- Legal Professionals, Port Arthur
- Libraries, Port Arthur
- Licensed Counselors, Port Arthur
- Life Insurance, Port Arthur
- Lighting Fixtures & Equipment, Port Arthur
- Limousine Service, Port Arthur
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- Linens, Port Arthur
- Liquid & Bulk Storage, Port Arthur
- Liquid Filters, Port Arthur
- Liquid Waste Treatment, Port Arthur
- Liquor Stores, Port Arthur
- Live Theaters, Port Arthur
- Livestock, Port Arthur
- Loans Check Cashing, Port Arthur
- Loans Personal, Port Arthur
- Loans Title Services, Port Arthur
- Local & Short Haul Trucking Companies, Port Arthur
- Locks, Port Arthur
- Locksmiths, Port Arthur - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Port Arthur
- Lodging, Port Arthur
- Lodging Services, Port Arthur
- Long Haul Trucking Companies, Port Arthur
- Lp Gas Equipment & Supplies, Port Arthur
- Lubricating Oils , Port Arthur - Motor Oil
- Lutheran Church, Port Arthur
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