- Labor & Employment Consultants, Mount Prospect
- Laboratories Dental, Mount Prospect
- Laboratories Medical, Mount Prospect
- Lamp Shades, Mount Prospect
- Lamps & Lamp Shades Retail, Mount Prospect - Desk, Table & Floor Lamps
- Land Surveyor, Mount Prospect - Land Surveying Services
- Landscape Contractors & Designers, Mount Prospect
- Landscaping, Mount Prospect
- Laundry & Dry Cleaning Equipment & Supplies, Mount Prospect - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Self Service, Mount Prospect
- Lawn & Garden Services, Mount Prospect
- Lawn Maintenance Services, Mount Prospect
- Lawyers & Attorneys, Mount Prospect
- Leather Goods & Luggage Repair, Mount Prospect
- Legal & Tax Services, Mount Prospect
- Legal Professionals, Mount Prospect
- Libraries, Mount Prospect
- License Services, Mount Prospect
- Life Insurance, Mount Prospect
- Lighting Consultants, Mount Prospect
- Lighting Contractors, Mount Prospect
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- Lighting Fixtures & Equipment, Mount Prospect
- Limousine Service, Mount Prospect
- Linens, Mount Prospect
- Liquor Stores, Mount Prospect
- Lithograph Inks Manufacturers, Mount Prospect
- Lithographic Printing, Mount Prospect
- Livestock, Mount Prospect
- Loans Personal, Mount Prospect
- Local & Short Haul Trucking Companies, Mount Prospect
- Locks, Mount Prospect
- Locksmiths, Mount Prospect - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Mount Prospect
- Lodging, Mount Prospect
- Lodging Services, Mount Prospect
- Logistics Freight, Mount Prospect
- Long Haul Trucking Companies, Mount Prospect
- Luggage & Accessories , Mount Prospect
- Lumber & Lumber Products, Mount Prospect
- Lumber & Lumber Products, Mount Prospect
- Lutheran Church, Mount Prospect
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