- Laboratories Dental, Onalaska
- Laboratories Medical, Onalaska
- Landscape Contractors & Designers, Onalaska
- Landscaping, Onalaska
- Landscaping Materials & Supplies, Onalaska
- Late Night Restaurants, Onalaska
- Laundry Self Service, Onalaska
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Onalaska
- Lawn & Garden Equipment & Supplies, Onalaska
- Lawn & Garden Services, Onalaska
- Lawn & Garden Sprinkler Systems, Onalaska
- Lawn & Yard, Onalaska
- Lawn Maintenance Services, Onalaska
- Lawn Mower Repair & Blade Sharpening Service, Onalaska
- Lawyers & Attorneys, Onalaska
- Leather Goods Cleaners & Dyers, Onalaska
- Legal Professionals, Onalaska
- Libraries, Onalaska
- Life Insurance, Onalaska
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- Liquor Stores, Onalaska
- Livestock, Onalaska
- Livestock Dealers, Onalaska
- Loans Check Cashing, Onalaska
- Loans Personal, Onalaska
- Loans Title Services, Onalaska
- Local & Short Haul Trucking Companies, Onalaska
- Locks, Onalaska
- Locksmiths, Onalaska - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Onalaska
- Lodging, Onalaska
- Lodging Services, Onalaska
- Long Haul Trucking Companies, Onalaska
- Lubricating Oils , Onalaska - Motor Oil
- Lubricating Oils & Greases, Onalaska
- Lumber & Lumber Products, Onalaska
- Lumber & Lumber Products, Onalaska
- Lumber Brokers, Onalaska
- Lutheran Church, Onalaska
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