- Labor & Employment Consultants, Norwalk
- Labor Organizations, Norwalk
- Laboratories Dental, Norwalk
- Laboratories Medical, Norwalk
- Ladder & Lift Equipment & Machine Rental, Norwalk
- Lamp Shades, Norwalk
- Lamps & Lamp Shades Retail, Norwalk - Desk, Table & Floor Lamps
- Land Surveyor, Norwalk - Land Surveying Services
- Landscape Contractors & Designers, Norwalk
- Landscape Garden Services, Norwalk
- Landscape Lighting, Norwalk
- Landscaping, Norwalk
- Landscaping Materials & Supplies, Norwalk
- Late Night Restaurants, Norwalk
- Laundromats & Dry-Cleaning, Coin-Operated, Norwalk
- Laundry Self Service, Norwalk
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Norwalk
- Lawn & Garden Decor & Ornaments, Norwalk
- Lawn & Garden Equipment & Supplies, Norwalk
- Lawn & Garden Services, Norwalk
- Lawn & Garden Sprinkler Systems, Norwalk
- Lawn & Tree Service, Norwalk
- Lawn Maintenance Services, Norwalk
- Lawn Mower Repair & Blade Sharpening Service, Norwalk
- Lawn Mowers & Power Equipment, Norwalk
- Lawyers & Attorneys, Norwalk
- Lead Paint Testing, Detection & Removal, Norwalk
- Leather Apparel Goods Manufacturers, Norwalk
- Leather Goods, Norwalk
- Leather Goods Stores & Dealers, Norwalk
- Legal & Tax Services, Norwalk
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- Legal Information & Referral Services, Norwalk
- Legal Professionals, Norwalk
- Libraries, Norwalk
- License Bureaus Motor Vehicles, Norwalk
- Lighting Consultants, Norwalk
- Lighting Contractors, Norwalk
- Lighting Fixtures & Equipment, Norwalk
- Lighting Fixtures Repair, Maintenance & Installation, Norwalk
- Limousine Service, Norwalk
- Linen Supply Services, Norwalk
- Linens, Norwalk
- Lingerie & Underwear for Women, Norwalk - Bras, Panties, Bustiers, Corsets & More
- Liquor & Beer Manufacturers, Norwalk
- Liquor Stores, Norwalk
- Literary Agents, Norwalk
- Living Room Furniture, Norwalk
- Loans Personal, Norwalk
- Local & Short Haul Trucking Companies, Norwalk
- Locks, Norwalk
- Locksmiths, Norwalk - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Norwalk
- Lodging, Norwalk
- Lodging Services, Norwalk
- Long Haul Trucking Companies, Norwalk
- Long Term Care Facility, Norwalk
- Lp Gas Equipment & Supplies, Norwalk
- Luggage & Accessories , Norwalk
- Lumber & Lumber Products, Norwalk
- Lumber & Lumber Products, Norwalk
- Luncheonette Restaurants, Norwalk
- Lutheran Church, Norwalk
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