- Labor & Employment Consultants, Barrington
- Laboratories Dental, Barrington
- Laboratories Medical, Barrington
- Lakes & Ponds Construction Maintenance Restoration & Control, Barrington
- Land Surveyor, Barrington - Land Surveying Services
- Landscape Contractors & Designers, Barrington
- Landscaping, Barrington
- Laundry & Dry Cleaning Equipment & Supplies, Barrington - Cleaners & Dryers Sales, Repair, Service & Leasing
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Barrington
- Lawn & Garden Equipment & Supplies, Barrington
- Lawn & Garden Services, Barrington
- Lawn Maintenance Services, Barrington
- Lawn Spraying & Treatment, Barrington
- Lawyers & Attorneys, Barrington
- Legal & Tax Services, Barrington
- Legal Professionals, Barrington
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- Life Insurance, Barrington
- Lighting Fixtures & Equipment, Barrington
- Limousine Service, Barrington
- Lingerie & Underwear for Women, Barrington - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Barrington
- Livestock, Barrington
- Livestock Dealers, Barrington
- Locks, Barrington
- Locksmiths, Barrington - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Barrington
- Lodging, Barrington
- Lodging Services, Barrington
- Logistics Freight, Barrington
- Long Haul Trucking Companies, Barrington
- Lubricating Oils , Barrington - Motor Oil
- Lutheran Church, Barrington
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