- Laboratories Dental, Glendale Heights
- Laboratories Medical, Glendale Heights
- Laminating Services, Glendale Heights
- Late Night Restaurants, Glendale Heights
- Laundromats & Dry-Cleaning, Coin-Operated, Glendale Heights
- Laundry Self Service, Glendale Heights
- Lawyers & Attorneys, Glendale Heights
- Legal Professionals, Glendale Heights
- Libraries, Glendale Heights
- Limousine Service, Glendale Heights
- Liquor Stores, Glendale Heights
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- Loans Personal, Glendale Heights
- Locks, Glendale Heights
- Locksmiths, Glendale Heights - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Glendale Heights
- Lodging, Glendale Heights
- Logistics Freight, Glendale Heights
- Long Haul Trucking Companies, Glendale Heights
- Lumber & Lumber Products, Glendale Heights
- Lumber & Lumber Products, Glendale Heights
- Lutheran Church, Glendale Heights
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