| Porsgrunn to Castelfidardo | 1,093.59 mi (1,759.96 km) |
| Porsgrunn to Castelfiorentino | 1,073.35 mi (1,727.38 km) |
| Porsgrunn to Castelfranco di Sopra | 1,073.25 mi (1,727.24 km) |
| Porsgrunn to Castelfranco di Sotto | 1,066.02 mi (1,715.60 km) |
| Porsgrunn to Castelfranco Emilia | 1,004.74 mi (1,616.98 km) |
| Porsgrunn to Castelfranco Veneto | 933.81 mi (1,502.83 km) |
| Porsgrunn to Castellabate | 1,321.43 mi (2,126.64 km) |
| Porsgrunn to Castellammare del Golfo | 1,463.92 mi (2,355.95 km) |
| Porsgrunn to Castellammare di Stabia | 1,289.54 mi (2,075.32 km) |
| Porsgrunn to Castellamonte | 952.55 mi (1,532.98 km) |
| Porsgrunn to Castellana Grotte | 1,300.62 mi (2,093.14 km) |
| Porsgrunn to Castellaneta | 1,315.06 mi (2,116.39 km) |
| Porsgrunn to Castellanza | 933.29 mi (1,501.99 km) |
| Porsgrunn to Castellarano | 1,006.24 mi (1,619.39 km) |
| Porsgrunn to Castelleone | 954.86 mi (1,536.70 km) |
