| Porsgrunn to Cookeville (Tennessee) | 4,288.06 mi (6,900.97 km) |
| Porsgrunn to Coolidge (Arizona) | 5,245.82 mi (8,442.33 km) |
| Porsgrunn to Coon Rapids (Minnesota) | 4,020.18 mi (6,469.86 km) |
| Porsgrunn to Cooper City (Florida) | 4,688.69 mi (7,545.72 km) |
| Porsgrunn to Coos Bay (Oregon) | 4,884.82 mi (7,861.36 km) |
| Porsgrunn to Copiague (New York) | 3,640.87 mi (5,859.41 km) |
| Porsgrunn to Coppell (Texas) | 4,831.57 mi (7,775.66 km) |
| Porsgrunn to Copperas Cove (Texas) | 4,968.59 mi (7,996.17 km) |
| Porsgrunn to Coral Gables (Florida) | 4,707.90 mi (7,576.63 km) |
| Porsgrunn to Coral Springs (Florida) | 4,674.89 mi (7,523.51 km) |
| Porsgrunn to Coral Terrace (Florida) | 4,706.59 mi (7,574.53 km) |
| Porsgrunn to Coralville (Iowa) | 4,165.00 mi (6,702.92 km) |
| Porsgrunn to Coram (New York) | 3,616.74 mi (5,820.58 km) |
| Porsgrunn to Corcoran (California) | 5,247.21 mi (8,444.57 km) |
| Porsgrunn to Cordele (Georgia) | 4,468.43 mi (7,191.25 km) |
