- Labor Organizations, Norwalk
- Laboratories Dental, Norwalk
- Laboratories Medical, Norwalk
- Landscape Contractors & Designers, Norwalk
- Landscaping, Norwalk
- Language Schools, Norwalk
- Late Night Restaurants, Norwalk
- Laundromats & Dry-Cleaning, Coin-Operated, Norwalk
- Laundry Self Service, Norwalk
- Lawn & Garden Equipment & Supplies, Norwalk
- Lawn & Garden Services, Norwalk
- Lawn & Garden Sprinkler Systems, Norwalk
- Lawn Maintenance Services, Norwalk
- Lawyers & Attorneys, Norwalk
- Lead Testing, Detection & Removal - Commercial & Industrial, Norwalk - Lead Paint
- Lead Testing, Detection & Removal - Residential, Norwalk - Lead Paint
- Legal & Tax Services, Norwalk
- Legal Clinics, Norwalk
- Legal Forms & Supplies , Norwalk
- Legal Information & Referral Services, Norwalk
- Legal Professionals, Norwalk
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- Legal Services Publishers, Norwalk
- Libraries, Norwalk
- License Services, Norwalk
- Life Insurance, Norwalk
- Lighting Consultants & Designers, Norwalk
- Lighting Fixtures & Equipment, Norwalk
- Limousine Service, Norwalk
- Liquor Stores, Norwalk
- Loans Check Cashing, Norwalk
- Loans Personal, Norwalk
- Loans Title Services, Norwalk
- Local & Short Haul Trucking Companies, Norwalk
- Locks, Norwalk
- Locksmiths, Norwalk - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Norwalk
- Lodging, Norwalk
- Logistics Freight, Norwalk
- Long Haul Trucking Companies, Norwalk
- Lumber & Lumber Products, Norwalk
- Lutheran Church, Norwalk
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