- Labor & Employment Consultants, Wallingford
- Labor Organizations, Wallingford
- Laboratories Medical, Wallingford
- Land Surveyor, Wallingford - Land Surveying Services
- Landscape Contractors & Designers, Wallingford
- Landscaping, Wallingford
- Landscaping Materials & Supplies, Wallingford
- Late Night Restaurants, Wallingford
- Laundromats & Dry-Cleaning, Coin-Operated, Wallingford
- Laundry Self Service, Wallingford
- Lawn & Garden Equipment & Supplies, Wallingford
- Lawn & Garden Services, Wallingford
- Lawn & Garden Sprinkler Systems, Wallingford
- Lawn Maintenance Services, Wallingford
- Lawn Mowers & Power Equipment, Wallingford
- Lawyers & Attorneys, Wallingford
- Legal & Tax Services, Wallingford
- Legal Professionals, Wallingford
- Libraries, Wallingford
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- Lifts Auto & Truck, Etc, Wallingford
- Lighting Consultants, Wallingford
- Lighting Contractors, Wallingford
- Lighting Fixtures & Equipment, Wallingford
- Lighting Maintenance, Wallingford
- Limousine Service, Wallingford
- Liquor Stores, Wallingford
- Loans Personal, Wallingford
- Local & Short Haul Trucking Companies, Wallingford
- Locks, Wallingford
- Locksmiths, Wallingford - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Wallingford
- Lodging, Wallingford
- Logistics Freight, Wallingford
- Long Haul Trucking Companies, Wallingford
- Lumber & Lumber Products, Wallingford
- Lumber Companies, Wallingford - Wholesale, Manufacturers & Suppliers
- Luncheonette Restaurants, Wallingford
- Lutheran Church, Wallingford
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