- Landscape Contractors & Designers, Seagoville
- Landscaping, Seagoville
- Landscaping Materials & Supplies, Seagoville
- Late Night Restaurants, Seagoville
- Lawn & Garden Services, Seagoville
- Lawn Maintenance Services, Seagoville
- Lawyers & Attorneys, Seagoville
- Lead Testing, Detection & Removal - Commercial & Industrial, Seagoville - Lead Paint
- Lead Testing, Detection & Removal - Residential, Seagoville - Lead Paint
- Legal Professionals, Seagoville
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- Libraries, Seagoville
- Livestock, Seagoville
- Loans Check Cashing, Seagoville
- Loans Personal, Seagoville
- Locks, Seagoville
- Locksmiths, Seagoville - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Seagoville
- Lodging, Seagoville
- Long Haul Trucking Companies, Seagoville
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