- Laboratories Medical, Warrenton
- Land Companies, Warrenton
- Land Surveyor, Warrenton - Land Surveying Services
- Landscape Contractors & Designers, Warrenton
- Landscaping, Warrenton
- Landscaping Materials & Supplies, Warrenton
- Late Night Restaurants, Warrenton
- Laundry Self Service, Warrenton
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Warrenton
- Lawn & Garden Equipment & Supplies, Warrenton
- Lawn & Garden Services, Warrenton
- Lawn Hydroseeding, Warrenton
- Lawn Maintenance Services, Warrenton
- Lawyers & Attorneys, Warrenton
- Legal & Tax Services, Warrenton
- Legal Professionals, Warrenton
- Life Insurance, Warrenton
- Limousine Service, Warrenton
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- Liquid & Bulk Storage, Warrenton
- Liquid Transportation - Non Hazardous, Warrenton
- Liquor & Beer Manufacturers, Warrenton
- Liquor Stores, Warrenton
- Live Theaters, Warrenton
- Livestock, Warrenton
- Livestock Dealers, Warrenton
- Loans Personal, Warrenton
- Loans Title Services, Warrenton
- Locks, Warrenton
- Locksmiths, Warrenton - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Warrenton
- Lodging, Warrenton
- Lodging Services, Warrenton
- Long Haul Trucking Companies, Warrenton
- Lumber & Lumber Products, Warrenton
- Lumber & Lumber Products, Warrenton
- Lutheran Church, Warrenton
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