- Laboratories Medical, Darlington
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Darlington
- Lawn & Garden Equipment & Supplies, Darlington
- Lawn Mowers & Power Equipment, Darlington
- Lawyers & Attorneys, Darlington
- Legal Professionals, Darlington
- Libraries, Darlington
- Lime & Limestone, Darlington
- Liquid Waste Treatment, Darlington
- Livestock, Darlington
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- Loans Personal, Darlington
- Locks, Darlington
- Locksmiths, Darlington - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Darlington
- Lodging, Darlington
- Long Term Care Facility, Darlington
- Lumber & Lumber Products, Darlington
- Lumber & Lumber Products, Darlington
- Lutheran Church, Darlington
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