- Laboratories Medical, Waupaca
- Land Surveyor, Waupaca - Land Surveying Services
- Landscape Contractors & Designers, Waupaca
- Landscaping, Waupaca
- Laundromats & Dry-Cleaning, Coin-Operated, Waupaca
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Waupaca
- Lawn & Garden Equipment & Supplies, Waupaca
- Lawn & Garden Services, Waupaca
- Lawn & Garden Sprinkler Systems, Waupaca
- Lawn Maintenance Services, Waupaca
- Lawn Mower Repair & Blade Sharpening Service, Waupaca
- Lawn Mowers & Power Equipment, Waupaca
- Lawyers & Attorneys, Waupaca
- Legal Professionals, Waupaca
- Licensed Counselors, Waupaca
- Life Insurance, Waupaca
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- Lighting Fixtures & Equipment, Waupaca
- Lime & Limestone, Waupaca
- Limousine Service, Waupaca
- Livestock, Waupaca
- Loans Personal, Waupaca
- Local & Short Haul Trucking Companies, Waupaca
- Locks, Waupaca
- Locksmiths, Waupaca - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Waupaca
- Lodging, Waupaca
- Long Haul Trucking Companies, Waupaca
- Lumber & Lumber Products, Waupaca
- Lumber & Lumber Products, Waupaca
- Lumber Companies, Waupaca - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Waupaca
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