- Labor Organizations, Fairhaven
- Laboratories Dental, Fairhaven
- Laboratories Medical, Fairhaven
- Landscape Contractors & Designers, Fairhaven
- Landscaping, Fairhaven
- Lawn & Garden Equipment & Supplies, Fairhaven
- Lawn & Garden Services, Fairhaven
- Lawn Maintenance Services, Fairhaven
- Lawn Mower Repair & Blade Sharpening Service, Fairhaven
- Lawn Mowers & Power Equipment, Fairhaven
- Lawyers & Attorneys, Fairhaven
- Legal & Tax Services, Fairhaven
- Legal Professionals, Fairhaven
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- Libraries, Fairhaven
- Liquor Stores, Fairhaven
- Livestock, Fairhaven
- Livestock Auctions, Fairhaven
- Livestock Auctions, Fairhaven
- Loans Personal, Fairhaven
- Locksmiths, Fairhaven - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Fairhaven
- Lodging Services, Fairhaven
- Lottery Game Retailers, Fairhaven
- Lumber & Lumber Products, Fairhaven
- Lumber & Lumber Products, Fairhaven
- Lutheran Church, Fairhaven
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