- Laboratories Medical, Conneaut
- Late Night Restaurants, Conneaut
- Lawn & Garden Equipment & Supplies, Conneaut
- Lawn Mowers & Power Equipment, Conneaut
- Lawyers & Attorneys, Conneaut
- Leather Apparel Goods Manufacturers, Conneaut
- Leather Goods, Conneaut
- Legal & Tax Services, Conneaut
- Legal Professionals, Conneaut
- Libraries, Conneaut
- Liquid Transportation - Non Hazardous, Conneaut
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- Liquor Stores, Conneaut
- Loans Personal, Conneaut
- Local & Short Haul Trucking Companies, Conneaut
- Locks, Conneaut
- Locksmiths, Conneaut - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Conneaut
- Lodging, Conneaut
- Lodging Services, Conneaut
- Long Haul Trucking Companies, Conneaut
- Lubricating Oils , Conneaut - Motor Oil
- Lutheran Church, Conneaut
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