- Laboratories Medical, Jerseyville
- Land Surveyor, Jerseyville - Land Surveying Services
- Landscape Contractors & Designers, Jerseyville
- Landscaping, Jerseyville
- Late Night Restaurants, Jerseyville
- Laundry Self Service, Jerseyville
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Jerseyville
- Lawn & Garden Equipment & Supplies, Jerseyville
- Lawn & Garden Services, Jerseyville
- Lawn Maintenance Services, Jerseyville
- Lawn Mower Repair & Blade Sharpening Service, Jerseyville
- Lawn Mowers & Power Equipment, Jerseyville
- Lawyers & Attorneys, Jerseyville
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- Legal Professionals, Jerseyville
- Libraries, Jerseyville
- License Services, Jerseyville
- Liquor Stores, Jerseyville
- Livestock, Jerseyville
- Loans Personal, Jerseyville
- Local & Short Haul Trucking Companies, Jerseyville
- Lodging, Jerseyville
- Long Haul Trucking Companies, Jerseyville
- Lumber & Lumber Products, Jerseyville
- Lumber & Lumber Products, Jerseyville
- Lutheran Church, Jerseyville
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