- Laboratories Dental, Ridgefield
- Laboratories Medical, Ridgefield
- Land Surveyor, Ridgefield - Land Surveying Services
- Landscape Contractors & Designers, Ridgefield
- Landscaping, Ridgefield
- Lawn & Garden Services, Ridgefield
- Lawn & Garden Supply, Ridgefield
- Lawn Maintenance Services, Ridgefield
- Leather Goods Stores & Dealers, Ridgefield
- Legal & Tax Services, Ridgefield
- License Services, Ridgefield
- Life Insurance, Ridgefield
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- Limousine Service, Ridgefield
- Liquor Stores, Ridgefield
- Live Theaters, Ridgefield
- Livestock, Ridgefield
- Livestock Breeders, Ridgefield
- Livestock Services, Ridgefield
- Locks, Ridgefield
- Locksmiths, Ridgefield - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Ridgefield
- Lodging, Ridgefield
- Long Haul Trucking Companies, Ridgefield
- Lutheran Church, Ridgefield
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