- Tanning Salons, Johnston
- Tarps, Johnston - Tarpaulins
- Tax Return Preparation, Johnston
- Taxi Cab Service, Johnston
- Taxi Service, Johnston
- Telecommunications, Johnston
- Telephone Equipment & Phone Systems, Johnston - Sales, Service & Repair
- Telephone Equipment & Systems - Repair & Service, Johnston - Telecommunication Services
- Telephone Wire & TV Cable Contractors, Johnston - Phone Jack - Wiring Installation
- Tents, Canopies & Awnings, Johnston
- Testing Laboratories, Johnston - Lab Tests
- Tires - Wholesale & Retail, Johnston
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- Tools & Hardware Supplies, Johnston
- Towing Service, Johnston
- Traffic Signs, Signals & Equipment , Johnston
- Transcription Services, Johnston
- Transportation, Johnston
- Transportation & Traffic Consultants & Services, Johnston - Transportation Brokers & Consultants
- Transportation Rental & Leasing, Johnston
- Travel & Tourism, Johnston
- Travel Arrangement & Services, Johnston
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, Johnston - Collection, Removal, Disposal, Recycling, etc
- Tutoring Instructor, Johnston
- TV Stations & Broadcasting Companies, Johnston - Cable TV Networks, Talk Shows, etc
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