- Tank & Pipe Working Industrial Equipment, Columbia City
- Tanning Salons, Columbia City
- Tattooing, Columbia City
- Tax Return Preparation, Columbia City
- Taxidermists, Columbia City - Taxidermy
- Telecommunications, Columbia City
- Telephone Communication Service & Phone Companies, Columbia City - Local & Long Distance Telephone Service
- Telephone Equipment & Phone Systems, Columbia City - Sales, Service & Repair
- Temperature Controlled Containers, Columbia City
- Tent Rentals, Columbia City
- Testing Calibration & Gauge Testing Labs, Columbia City
- Testing Laboratories, Columbia City - Lab Tests
- Tire Retread, Regroove & Repair Equipment, Columbia City
- Tires - Wholesale & Retail, Columbia City
- Title & Surety Insurance, Columbia City
- Title Companies, Columbia City - Title Search, Service & Abstract Company
- Tool & Die Makers, Columbia City
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- Tools & Hardware Supplies, Columbia City
- Tools Reels, Columbia City
- Towing Service, Columbia City
- Trailer Hitch, Columbia City - Accessories, Parts, Installation, etc
- Transportation, Columbia City
- Transportation Equipment Manufacturers, Columbia City
- Transportation Facilities & Services, Columbia City
- Travel & Tourism, Columbia City
- Travel Arrangement & Services, Columbia City
- Tree & Shrub Transplanting & Removal, Columbia City
- Tree Farms, Columbia City
- Tribal Administrative Agencies, Columbia City
- Tribal Government, Columbia City
- Truck Campers & Camper Shells, Columbia City - Truck Caps, Toppers, Bed Covers, Tonneau Covers, etc
- Truck Rental & Leasing, Columbia City - Rent a Truck & Tractor
- Truck Repair & Service, Columbia City
- Tutoring Instructor, Columbia City
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