- Tanning Salons, Irmo
- Tax Preparations Electronic Filings, Irmo
- Tax Return Preparation, Irmo
- Tax Services, Irmo
- Telecommunications, Irmo
- Telephone Answering Service, Irmo - Messenger Services
- Telephones On Hold Audio Services, Irmo
- Temp Agencies, Irmo
- Temporary & Contractor Agencies, Irmo
- Tents, Canopies & Awnings, Irmo
- Testing Laboratories, Irmo - Lab Tests
- Textile Machinery, Supplies & Equipment, Irmo - Cutting Machine, Embroidery Machine, Sewing Supplies, etc
- Thrift Stores, Resale & Consignment Shops, Irmo
- Tile & Floor Repair Services, Irmo
- Tire Retread, Regroove & Repair Equipment, Irmo
- Tires - Wholesale & Retail, Irmo
- Title & Surety Insurance, Irmo
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- Tools & Hardware Supplies, Irmo
- Tourist Attractions, Irmo
- Towing Service, Irmo
- Toy Stores, Irmo
- Trailer Rental & Leasing, Irmo
- Transcription Services, Irmo
- Transportation, Irmo
- Transportation & Traffic Consultants & Services, Irmo - Transportation Brokers & Consultants
- Transportation Equipment Manufacturers, Irmo
- Transportation Facilities & Services, Irmo
- Transportation Rental & Leasing, Irmo
- Travel & Tourism, Irmo
- Travel Agents - Luxury, Irmo
- Travel Arrangement & Services, Irmo
- Truck Rental & Leasing, Irmo - Rent a Truck & Tractor
- Truck Repair & Service, Irmo
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