| Porsgrunn to Trezzo sull'Adda | 933.26 mi (1,501.93 km) |
| Porsgrunn to Tricase | 1,378.37 mi (2,218.28 km) |
| Porsgrunn to Trieste | 945.55 mi (1,521.72 km) |
| Porsgrunn to Triggiano | 1,285.55 mi (2,068.89 km) |
| Porsgrunn to Trinitapoli | 1,258.17 mi (2,024.83 km) |
| Porsgrunn to Trissino | 938.67 mi (1,510.65 km) |
| Porsgrunn to Triuggio | 929.41 mi (1,495.74 km) |
| Porsgrunn to Trofarello | 979.94 mi (1,577.07 km) |
| Porsgrunn to Troina | 1,489.91 mi (2,397.77 km) |
| Porsgrunn to Turin | 973.54 mi (1,566.76 km) |
| Porsgrunn to Udine | 913.32 mi (1,469.85 km) |
| Porsgrunn to Ugento | 1,376.00 mi (2,214.46 km) |
| Porsgrunn to Umbertide | 1,098.42 mi (1,767.74 km) |
| Porsgrunn to Urbino | 1,070.57 mi (1,722.92 km) |
| Porsgrunn to Urgnano | 934.03 mi (1,503.18 km) |
