| Herndon to Tacoma (Washington) | 2,309.75 mi (3,717.18 km) |
| Herndon to Tahlequah (Oklahoma) | 986.17 mi (1,587.09 km) |
| Herndon to Takoma Park (Maryland) | 20.64 mi (33.21 km) |
| Herndon to Talladega (Alabama) | 617.76 mi (994.19 km) |
| Herndon to Tallahassee (Florida) | 705.30 mi (1,135.06 km) |
| Herndon to Tallmadge (Ohio) | 259.31 mi (417.32 km) |
| Herndon to Tamalpais-Homestead Valley (California) | 2,419.79 mi (3,894.28 km) |
| Herndon to Tamarac (Florida) | 897.44 mi (1,444.29 km) |
| Herndon to Tamiami (Florida) | 929.66 mi (1,496.14 km) |
| Herndon to Tampa (Florida) | 812.04 mi (1,306.84 km) |
| Herndon to Tanaina (Alaska) | 3,326.02 mi (5,352.71 km) |
| Herndon to Tanque Verde (Arizona) | 1,918.35 mi (3,087.28 km) |
| Herndon to Tarboro (North Carolina) | 212.00 mi (341.17 km) |
| Herndon to Tarpon Springs (Florida) | 808.74 mi (1,301.54 km) |
| Herndon to Tarrytown (New York) | 235.83 mi (379.53 km) |
