- Labor Organizations, Westbrook
- Labor Unions, Westbrook
- Laboratories Dental, Westbrook
- Laboratories Medical, Westbrook
- Land Surveyor, Westbrook - Land Surveying Services
- Landscape Contractors & Designers, Westbrook
- Landscaping, Westbrook
- Landscaping Materials & Supplies, Westbrook
- Laser Printers, Westbrook - Office Supplies
- Laundry & Dry Cleaning Equipment & Supplies, Westbrook - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Equipment Rental & Leasing, Westbrook
- Lawn & Garden Equipment & Supplies, Westbrook
- Lawn & Garden Services, Westbrook
- Lawn Maintenance Services, Westbrook
- Lawn Mowers & Power Equipment, Westbrook
- Lawyers & Attorneys, Westbrook
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- Legal & Tax Services, Westbrook
- Legal Professionals, Westbrook
- Lending Services, Westbrook
- Libraries, Westbrook
- Lithographic Printing, Westbrook
- Locks, Westbrook
- Locksmiths, Westbrook - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Westbrook
- Lodging, Westbrook
- Loggers, Westbrook
- Lubricating Oils , Westbrook - Motor Oil
- Lumber & Lumber Products, Westbrook
- Lumber & Lumber Products, Westbrook
- Lumber & Wood Products Manufacturers, Westbrook
- Lumber Companies, Westbrook - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Westbrook
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