- Land Surveyor, Johnston - Land Surveying Services
- Landscape Contractors & Designers, Johnston
- Landscaping, Johnston
- Lawn & Garden Equipment & Supplies, Johnston
- Lawn & Garden Services, Johnston
- Lawn & Garden Sprinkler Systems, Johnston
- Lawn Maintenance Services, Johnston
- Lawn Mower Repair & Blade Sharpening Service, Johnston
- Lawyers & Attorneys, Johnston
- Legal & Tax Services, Johnston
- Legal Professionals, Johnston
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- Libraries, Johnston
- Life Insurance, Johnston
- Lighting Fixtures & Equipment, Johnston
- Limousine Service, Johnston
- Liquor & Beer Manufacturers, Johnston
- Liquor Stores, Johnston
- Loans Personal, Johnston
- Lodging, Johnston
- Lubricating Oils , Johnston - Motor Oil
- Lumber Companies, Johnston - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Johnston
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