- Laboratories Medical, Southington
- Land Surveyor, Southington - Land Surveying Services
- Landscape Contractors & Designers, Southington
- Landscaping, Southington
- Landscaping Materials & Supplies, Southington
- Late Night Restaurants, Southington
- Laundromats & Dry-Cleaning, Coin-Operated, Southington
- Lawn & Garden Services, Southington
- Lawn Hydroseeding, Southington
- Lawn Maintenance Services, Southington
- Lawn Mower Repair & Blade Sharpening Service, Southington
- Lawyers & Attorneys, Southington
- Legal & Tax Services, Southington
- Legal Professionals, Southington
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- Lighting Fixtures & Equipment, Southington
- Linens, Southington
- Liquor Stores, Southington
- Livestock, Southington
- Local & Short Haul Trucking Companies, Southington
- Locks, Southington
- Locksmiths, Southington - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Southington
- Lodging, Southington
- Lodging Services, Southington
- Long Haul Trucking Companies, Southington
- Luncheonette Restaurants, Southington
- Lutheran Church, Southington
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