- Tax Return Preparation, Stittsville
- Tax Services, Stittsville
- Telecommunications, Stittsville
- Telephone Equipment & Systems - Repair & Service, Stittsville - Telecommunication Services
- Testing Laboratories, Stittsville - Lab Tests
- Thrift Stores, Resale & Consignment Shops, Stittsville
- Tile Supplies, Stittsville - Tile Stores - Companies
- Tires - Wholesale & Retail, Stittsville
- Title & Surety Insurance, Stittsville
- Tool Repair & Parts, Stittsville
- Tools & Hardware Supplies, Stittsville
- Tourist Attractions, Stittsville
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- Tours & Guide Services, Stittsville
- Toy Stores, Stittsville
- Trailer Repair, Stittsville - Travel, Utility, Cargo, Boat Trailer, etc
- Transportation, Stittsville
- Travel & Tourism, Stittsville
- Travel Arrangement & Services, Stittsville
- Truck Campers & Camper Shells, Stittsville - Truck Caps, Toppers, Bed Covers, Tonneau Covers, etc
- Truck Rental & Leasing, Stittsville - Rent a Truck & Tractor
- Truck Repair & Service, Stittsville
- Truck Trailers Parts & Dealers, Stittsville
- Tutoring Instructor, Stittsville
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