- Labor & Employment Consultants, Northbrook
- Labor And Employment Relations Attorneys & Lawyers, Northbrook
- Labor And Employment Relations Lawyers & Attorneys, Northbrook
- Laboratories Dental, Northbrook
- Laboratories Medical, Northbrook
- Laboratory Equipment Repair & Service, Northbrook
- Lamp Repair, Northbrook
- Landscape Contractors & Designers, Northbrook
- Landscaping, Northbrook
- Laser Equipment Repair & Service, Northbrook
- Late Night Restaurants, Northbrook
- Laundromats & Dry-Cleaning, Coin-Operated, Northbrook
- Laundry Self Service, Northbrook
- Law & Financial Printers, Northbrook
- Lawn & Garden Equipment & Supplies, Northbrook
- Lawn & Garden Services, Northbrook
- Lawn Maintenance Services, Northbrook
- Lawn Mower Repair & Blade Sharpening Service, Northbrook
- Lawyers & Attorneys, Northbrook
- Leather Goods & Luggage Repair, Northbrook
- Leather Goods Cleaners & Dyers, Northbrook
- Legal & Tax Services, Northbrook
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- Legal Clinics, Northbrook
- Legal Professionals, Northbrook
- Library Furniture, Northbrook
- Life Insurance, Northbrook
- Lighting Fixtures & Equipment, Northbrook
- Lighting Fixtures Repair, Maintenance & Installation, Northbrook
- Limousine Service, Northbrook
- Linens, Northbrook
- Lingerie & Underwear for Women, Northbrook - Bras, Panties, Bustiers, Corsets & More
- Liquor & Beer Manufacturers, Northbrook
- Liquor Stores, Northbrook
- Loans Personal, Northbrook
- Locks, Northbrook
- Locksmiths, Northbrook - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Northbrook
- Lodging, Northbrook
- Lodging Services, Northbrook
- Long Haul Trucking Companies, Northbrook
- Luggage & Accessories , Northbrook
- Lumber & Lumber Products, Northbrook
- Lumber & Lumber Products, Northbrook
- Lutheran Church, Northbrook
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