| Porsgrunn to Castelletto sopra Ticino | 926.85 mi (1,491.63 km) |
| Porsgrunn to Castelli Calepio | 931.57 mi (1,499.22 km) |
| Porsgrunn to Castelnovo ne' Monti | 1,014.86 mi (1,633.27 km) |
| Porsgrunn to Castelnuovo Berardenga | 1,092.14 mi (1,757.63 km) |
| Porsgrunn to Castelnuovo di Porto | 1,179.46 mi (1,898.16 km) |
| Porsgrunn to Castelnuovo di Verona | 946.38 mi (1,523.05 km) |
| Porsgrunn to Castelnuovo Rangone | 1,007.70 mi (1,621.73 km) |
| Porsgrunn to Castelvetrano | 1,487.19 mi (2,393.39 km) |
| Porsgrunn to Castelvetro di Modena | 1,011.18 mi (1,627.34 km) |
| Porsgrunn to Castenaso | 1,011.88 mi (1,628.46 km) |
| Porsgrunn to Castenedolo | 943.11 mi (1,517.79 km) |
| Porsgrunn to Castiglion Fiorentino | 1,093.75 mi (1,760.22 km) |
| Porsgrunn to Castiglione del Lago | 1,108.38 mi (1,783.76 km) |
| Porsgrunn to Castiglione delle Stiviere | 948.23 mi (1,526.03 km) |
| Porsgrunn to Castrolibero | 1,397.41 mi (2,248.92 km) |
