- Laboratories Dental, Baraboo
- Laboratories Medical, Baraboo
- Ladies Ready To Wear, Baraboo
- Land Surveyor, Baraboo - Land Surveying Services
- Landscape Contractors & Designers, Baraboo
- Landscaping, Baraboo
- Landscaping Materials & Supplies, Baraboo
- Late Night Restaurants, Baraboo
- Laundry Self Service, Baraboo
- Lawn & Garden Equipment & Supplies, Baraboo
- Lawn & Garden Services, Baraboo
- Lawn & Yard, Baraboo
- Lawn Maintenance Services, Baraboo
- Lawn Mowers & Power Equipment, Baraboo
- Lawyers & Attorneys, Baraboo
- Leather Goods Stores & Dealers, Baraboo
- Legal Professionals, Baraboo
- Libraries, Baraboo
- Licensed Counselors, Baraboo
- Life Insurance, Baraboo
- Limousine Service, Baraboo
- Linen Supply Services, Baraboo
- Lingerie & Underwear for Women, Baraboo - Bras, Panties, Bustiers, Corsets & More
- Liquid Waste Treatment, Baraboo
- Liquor Stores, Baraboo
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- Live Theaters, Baraboo
- Livestock, Baraboo
- Livestock Breeders, Baraboo
- Livestock Dealers, Baraboo
- Livestock Equipment & Supplies, Baraboo
- Livestock Producers, Baraboo
- Livestock Services, Baraboo
- Livestock Trailers, Baraboo
- Living Room Furniture, Baraboo
- Loans Check Cashing, Baraboo
- Loans Personal, Baraboo
- Local & Short Haul Trucking Companies, Baraboo
- Locks, Baraboo
- Locksmiths, Baraboo - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Baraboo
- Lodging, Baraboo
- Lodging Services, Baraboo
- Log Homes - Log Cabins Builders, Baraboo - Building Contractors
- Loggers, Baraboo
- Logistics Freight, Baraboo
- Long Haul Trucking Companies, Baraboo
- Long Term Care Facility, Baraboo
- Lumber & Lumber Products, Baraboo
- Lumber & Lumber Products, Baraboo
- Lutheran Church, Baraboo
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