- Labor Organizations, North Chicago
- Laboratories Medical, North Chicago
- Landscape Contractors & Designers, North Chicago
- Landscaping, North Chicago
- Landscaping Materials & Supplies, North Chicago
- Late Night Restaurants, North Chicago
- Laundromats & Dry-Cleaning, Coin-Operated, North Chicago
- Lawn & Garden Services, North Chicago
- Lawn Maintenance Services, North Chicago
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- Lawyers & Attorneys, North Chicago
- Legal Professionals, North Chicago
- Libraries, North Chicago
- Lighting Fixtures & Equipment, North Chicago
- Liquor Stores, North Chicago
- Loans Personal, North Chicago
- Locksmiths, North Chicago - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, North Chicago
- Long Haul Trucking Companies, North Chicago
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