| Mercer Island to Trezzo sull'Adda | 5,368.34 mi (8,639.51 km) |
| Mercer Island to Tricase | 5,925.33 mi (9,535.90 km) |
| Mercer Island to Trieste | 5,467.79 mi (8,799.56 km) |
| Mercer Island to Triggiano | 5,821.63 mi (9,369.00 km) |
| Mercer Island to Trinitapoli | 5,785.13 mi (9,310.26 km) |
| Mercer Island to Trissino | 5,416.13 mi (8,716.42 km) |
| Mercer Island to Triuggio | 5,358.60 mi (8,623.83 km) |
| Mercer Island to Trofarello | 5,359.83 mi (8,625.81 km) |
| Mercer Island to Troina | 5,967.84 mi (9,604.31 km) |
| Mercer Island to Turin | 5,352.73 mi (8,614.38 km) |
| Mercer Island to Udine | 5,430.15 mi (8,738.98 km) |
| Mercer Island to Ugento | 5,920.77 mi (9,528.56 km) |
| Mercer Island to Umbertide | 5,575.90 mi (8,973.54 km) |
| Mercer Island to Urbino | 5,557.62 mi (8,944.13 km) |
| Mercer Island to Urgnano | 5,373.38 mi (8,647.62 km) |
