- Land Surveyor, Yankton - Land Surveying Services
- Landscape Contractors & Designers, Yankton
- Landscaping, Yankton
- Landscaping Materials & Supplies, Yankton
- Laser Game Centers, Yankton
- Late Night Restaurants, Yankton
- Laundry Equipment Rental & Leasing, Yankton
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Yankton
- Lawn & Garden Equipment & Supplies, Yankton
- Lawn & Garden Services, Yankton
- Lawn & Garden Sprinkler Systems, Yankton
- Lawn Maintenance Services, Yankton
- Lawn Mower Repair & Blade Sharpening Service, Yankton
- Lawn Mowers & Power Equipment, Yankton
- Lawyers & Attorneys, Yankton
- Legal Professionals, Yankton
- Libraries, Yankton
- Life Insurance, Yankton
- Lighting Fixtures & Equipment, Yankton
- Liquor & Beer Manufacturers, Yankton
- Liquor Stores, Yankton
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- Live Theaters, Yankton
- Livestock, Yankton
- Livestock Auctions, Yankton
- Livestock Auctions, Yankton
- Livestock Dealers, Yankton
- Livestock Trailers, Yankton
- Loans Check Cashing, Yankton
- Loans Personal, Yankton
- Loans Title Services, Yankton
- Locks, Yankton
- Locksmiths, Yankton - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Yankton
- Lodging, Yankton
- Lodging Services, Yankton
- Long Haul Trucking Companies, Yankton
- Lp Gas Equipment & Supplies, Yankton
- Lubricating Oils , Yankton - Motor Oil
- Lumber & Lumber Products, Yankton
- Lumber & Lumber Products, Yankton
- Lutheran Church, Yankton
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