- Labor Organizations, Rhinelander
- Laboratories Dental, Rhinelander
- Laboratories Medical, Rhinelander
- Lake Resorts, Rhinelander
- Land Surveyor, Rhinelander - Land Surveying Services
- Landscape Contractors & Designers, Rhinelander
- Landscaping, Rhinelander
- Late Night Restaurants, Rhinelander
- Laundry Self Service, Rhinelander
- Lawn & Garden Equipment & Supplies, Rhinelander
- Lawn & Garden Services, Rhinelander
- Lawn & Garden Sprinkler Systems, Rhinelander
- Lawn Maintenance Services, Rhinelander
- Lawn Mower Repair & Blade Sharpening Service, Rhinelander
- Lawn Mowers & Power Equipment, Rhinelander
- Lawyers & Attorneys, Rhinelander
- Legal Professionals, Rhinelander
- Lending Services, Rhinelander
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- Libraries, Rhinelander
- Life Insurance, Rhinelander
- Lighting Fixtures & Equipment, Rhinelander
- Limousine Service, Rhinelander
- Liquor & Beer Manufacturers, Rhinelander
- Liquor Stores, Rhinelander
- Live Theaters, Rhinelander
- Livestock, Rhinelander
- Loans Personal, Rhinelander
- Lodging, Rhinelander
- Lodging Services, Rhinelander
- Log Homes - Log Cabins Builders, Rhinelander - Building Contractors
- Loggers, Rhinelander
- Long Haul Trucking Companies, Rhinelander
- Lumber & Lumber Products, Rhinelander
- Lumber & Lumber Products, Rhinelander
- Lutheran Church, Rhinelander
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