- Laboratories Dental, Swansea
- Laboratories Medical, Swansea
- Landscape Contractors & Designers, Swansea
- Landscaping, Swansea
- Laser Printers, Swansea - Office Supplies
- Lawn & Garden Equipment & Supplies, Swansea
- Lawn & Garden Services, Swansea
- Lawn Maintenance Services, Swansea
- Lawn Mowers & Power Equipment, Swansea
- Lawyers & Attorneys, Swansea
- Lead Paint Testing, Detection & Removal, Swansea
- Lead Testing, Detection & Removal - Commercial & Industrial, Swansea - Lead Paint
- Lead Testing, Detection & Removal - Residential, Swansea - Lead Paint
- Leather Goods Cleaners & Dyers, Swansea
- Legal & Tax Services, Swansea
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- Legal Professionals, Swansea
- Libraries, Swansea
- Limousine Service, Swansea
- Lingerie & Underwear for Women, Swansea - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Swansea
- Livestock, Swansea
- Loans Personal, Swansea
- Local & Short Haul Trucking Companies, Swansea
- Lodging, Swansea
- Lodging Services, Swansea
- Long Haul Trucking Companies, Swansea
- Lumber & Lumber Products, Swansea
- Lumber & Lumber Products, Swansea
- Lumber Commission, Swansea
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