| Porsgrunn to Cloverly (Maryland) | 3,845.33 mi (6,188.47 km) |
| Porsgrunn to Clovis (California) | 5,203.11 mi (8,373.60 km) |
| Porsgrunn to Clovis (New Mexico) | 4,926.52 mi (7,928.47 km) |
| Porsgrunn to Clute (Texas) | 5,014.60 mi (8,070.22 km) |
| Porsgrunn to Coachella (California) | 5,316.33 mi (8,555.81 km) |
| Porsgrunn to Coalinga (California) | 5,260.90 mi (8,466.59 km) |
| Porsgrunn to Coamo (Puerto Rico) | 4,659.31 mi (7,498.43 km) |
| Porsgrunn to Coatesville (Pennsylvania) | 3,758.68 mi (6,049.00 km) |
| Porsgrunn to Cockeysville (Maryland) | 3,812.79 mi (6,136.09 km) |
| Porsgrunn to Cocoa (Florida) | 4,571.22 mi (7,356.67 km) |
| Porsgrunn to Cocoa Beach (Florida) | 4,569.26 mi (7,353.51 km) |
| Porsgrunn to Coconut Creek (Florida) | 4,671.73 mi (7,518.43 km) |
| Porsgrunn to Coeur d'Alene (Idaho) | 4,461.81 mi (7,180.59 km) |
| Porsgrunn to Cohoes (New York) | 3,540.66 mi (5,698.14 km) |
| Porsgrunn to Cold Springs (Nevada) | 5,029.30 mi (8,093.88 km) |
