- Tanning Salons, Plain City
- Telecommunications, Plain City
- Telemarketing Equipment, Plain City
- Telemarketing Services, Plain City
- Tennis Courts, Plain City
- Tennis Lessons, Plain City - Includes Badminton Coaching
- Testing Laboratories, Plain City - Lab Tests
- Tires - Wholesale & Retail, Plain City
- Title & Surety Insurance, Plain City
- Title Companies, Plain City - Title Search, Service & Abstract Company
- Tool & Die Makers, Plain City
- Tools & Hardware Supplies, Plain City
- Towing Service, Plain City
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- Traffic Signs, Signals & Equipment , Plain City
- Trailer Parts & Equipment, Plain City
- Transmission Repair & Service, Plain City
- Transportation, Plain City
- Transportation & Distribution Management, Plain City
- Transportation & Traffic Consultants & Services, Plain City - Transportation Brokers & Consultants
- Transportation Equipment Manufacturers, Plain City
- Transportation Expeditors, Plain City
- Transportation Facilities & Services, Plain City
- Truck & Tractor Transmission Repair, Plain City
- Truck Repair & Service, Plain City
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, Plain City - Collection, Removal, Disposal, Recycling, etc
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