- Labor & Employment Consultants, Janesville
- Labor And Employment Relations Attorneys & Lawyers, Janesville
- Labor And Employment Relations Lawyers & Attorneys, Janesville
- Labor Organizations, Janesville
- Laboratories Dental, Janesville
- Laboratories Medical, Janesville
- Laminating Services, Janesville
- Land Surveyor, Janesville - Land Surveying Services
- Landscape Contractors & Designers, Janesville
- Landscape Garden Services, Janesville
- Landscaping, Janesville
- Landscaping Materials & Supplies, Janesville
- Laser Hair Removal, Janesville
- Late Night Restaurants, Janesville
- Laundromats & Dry-Cleaning, Coin-Operated, Janesville
- Laundry Self Service, Janesville
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Janesville
- Lawn & Garden Decor & Ornaments, Janesville
- Lawn & Garden Equipment & Supplies, Janesville
- Lawn & Garden Services, Janesville
- Lawn & Garden Sprinkler Systems, Janesville
- Lawn & Garden Supplies & Equipment, Janesville
- Lawn & Tree Service, Janesville
- Lawn & Yard, Janesville
- Lawn Maintenance Services, Janesville
- Lawn Mower Repair & Blade Sharpening Service, Janesville
- Lawn Mowers & Power Equipment, Janesville
- Lawn Spraying & Treatment, Janesville
- Lawyers & Attorneys, Janesville
- Leather Apparel Goods Manufacturers, Janesville
- Leather Goods, Janesville
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- Leather Goods & Luggage Repair, Janesville
- Leather Goods Cleaners & Dyers, Janesville
- Leather Tanning & Finishing Manufacturers, Janesville
- Legal & Tax Services, Janesville
- Legal Professionals, Janesville
- Libraries, Janesville
- Licensed Counselors, Janesville
- Life Insurance, Janesville
- Lighting Fixtures & Equipment, Janesville
- Lighting Fixtures Repair, Maintenance & Installation, Janesville
- Lime & Limestone, Janesville
- Linen Supply Services, Janesville
- Lingerie & Underwear for Women, Janesville - Bras, Panties, Bustiers, Corsets & More
- Liquid Filters, Janesville
- Liquor Stores, Janesville
- Litigation / Trial Attorneys & Lawyers, Janesville
- Living Room Furniture, Janesville
- Loans Check Cashing, Janesville
- Loans Personal, Janesville
- Loans Title Services, Janesville
- Local & Short Haul Trucking Companies, Janesville
- Locks, Janesville
- Locksmiths, Janesville - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Janesville
- Lodging, Janesville
- Lodging Services, Janesville
- Long Haul Trucking Companies, Janesville
- Lumber & Lumber Products, Janesville
- Lumber & Lumber Products, Janesville
- Lumber Companies, Janesville - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Janesville
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