| Porsgrunn to Celano | 1,188.15 mi (1,912.15 km) |
| Porsgrunn to Cento | 995.91 mi (1,602.76 km) |
| Porsgrunn to Cepagatti | 1,172.20 mi (1,886.47 km) |
| Porsgrunn to Ceprano | 1,224.73 mi (1,971.02 km) |
| Porsgrunn to Cercola | 1,276.86 mi (2,054.91 km) |
| Porsgrunn to Cerea | 963.53 mi (1,550.65 km) |
| Porsgrunn to Cerese | 972.81 mi (1,565.59 km) |
| Porsgrunn to Cerignola | 1,261.97 mi (2,030.94 km) |
| Porsgrunn to Cermenate | 927.29 mi (1,492.34 km) |
| Porsgrunn to Cernusco sul Naviglio | 939.72 mi (1,512.34 km) |
| Porsgrunn to Cerreto Guidi | 1,061.67 mi (1,708.59 km) |
| Porsgrunn to Cerro Maggiore | 934.37 mi (1,503.73 km) |
| Porsgrunn to Certaldo | 1,077.11 mi (1,733.44 km) |
| Porsgrunn to Cerveteri | 1,187.03 mi (1,910.34 km) |
| Porsgrunn to Cervia | 1,032.55 mi (1,661.73 km) |
