- Labor Organizations, Fairfield
- Laboratories Dental, Fairfield
- Laboratories Medical, Fairfield
- Laboratories Testing Drug Screening & Analysis, Fairfield
- Laminating Services, Fairfield
- Land Surveyor, Fairfield - Land Surveying Services
- Landscape Contractors & Designers, Fairfield
- Landscaping, Fairfield
- Landscaping Materials & Supplies, Fairfield
- Late Night Restaurants, Fairfield
- Laundromats & Dry-Cleaning, Coin-Operated, Fairfield
- Laundry Self Service, Fairfield
- Lawn & Garden Equipment & Supplies, Fairfield
- Lawn & Garden Services, Fairfield
- Lawn Maintenance Services, Fairfield
- Lawyers & Attorneys, Fairfield
- Legal & Tax Services, Fairfield
- Legal Professionals, Fairfield
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- Libraries, Fairfield
- License Bureaus, Fairfield
- License Services, Fairfield
- Life Insurance, Fairfield
- Lighting Fixtures & Equipment, Fairfield
- Limousine Service, Fairfield
- Liquor Stores, Fairfield
- Loans Personal, Fairfield
- Local & Short Haul Trucking Companies, Fairfield
- Locks, Fairfield
- Locksmiths, Fairfield - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Fairfield
- Lodging, Fairfield
- Lodging Services, Fairfield
- Logistics Freight, Fairfield
- Long Haul Trucking Companies, Fairfield
- Lumber & Lumber Products, Fairfield
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