- Labeling Equipment & Supplies, Largo
- Labor & Employment Consultants, Largo
- Laboratories Dental, Largo
- Laboratories Medical, Largo
- Laboratory Equipment Repair & Service, Largo
- Laminating Services, Largo
- Lamp Shades, Largo
- Lamps & Lamp Shades Retail, Largo - Desk, Table & Floor Lamps
- Land Surveyor, Largo - Land Surveying Services
- Landscape Contractors & Designers, Largo
- Landscape Lighting, Largo
- Landscaping, Largo
- Landscaping Materials & Supplies, Largo
- Laser Equipment Repair & Service, Largo
- Laser Hair Removal, Largo
- Laser Printers, Largo - Office Supplies
- Late Night Restaurants, Largo
- Latin American Restaurants, Largo
- Laundry & Dry Cleaning Equipment & Supplies, Largo - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Equipment Rental & Leasing, Largo
- Laundry Self Service, Largo
- Lawn & Garden Equipment & Supplies, Largo
- Lawn & Garden Services, Largo
- Lawn & Garden Sprinkler Systems, Largo
- Lawn & Garden Supplies & Equipment, Largo
- Lawn Maintenance Services, Largo
- Lawn Mower Repair & Blade Sharpening Service, Largo
- Lawn Mowers & Power Equipment, Largo
- Lawn Spraying & Treatment, Largo
- Lawyers & Attorneys, Largo
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- Lead Testing, Detection & Removal - Commercial & Industrial, Largo - Lead Paint
- Lead Testing, Detection & Removal - Residential, Largo - Lead Paint
- Leather Apparel Goods Manufacturers, Largo
- Leather Goods, Largo
- Legal & Tax Services, Largo
- Legal Information Service, Largo
- Legal Professionals, Largo
- Lennox Air Conditioning, Largo - Air Conditioner Contractors & Systems
- Libraries, Largo
- Licensed Counselors, Largo
- Life Insurance, Largo
- Lighting Fixtures & Equipment, Largo
- Lighting Fixtures Repair, Maintenance & Installation, Largo
- Limousine Service, Largo
- Linens, Largo
- Liquor Stores, Largo
- Live Theaters, Largo
- Livestock, Largo
- Loans Personal, Largo
- Local & Short Haul Trucking Companies, Largo
- Locks, Largo
- Locksmiths, Largo - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Largo
- Lodging, Largo
- Lodging Services, Largo
- Long Haul Trucking Companies, Largo
- Lumber & Lumber Products, Largo
- Lumber & Lumber Products, Largo
- Luncheonette Restaurants, Largo
- Lutheran Church, Largo
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