| Porsgrunn to Castle Rock (Colorado) | 4,677.38 mi (7,527.52 km) |
| Porsgrunn to Castro Valley (California) | 5,200.14 mi (8,368.81 km) |
| Porsgrunn to Catalina Foothills (Arizona) | 5,267.77 mi (8,477.66 km) |
| Porsgrunn to Cataño (Puerto Rico) | 4,630.53 mi (7,452.12 km) |
| Porsgrunn to Cathedral City (California) | 5,315.09 mi (8,553.81 km) |
| Porsgrunn to Catonsville (Maryland) | 3,828.21 mi (6,160.91 km) |
| Porsgrunn to Cave Spring (Virginia) | 4,048.03 mi (6,514.68 km) |
| Porsgrunn to Cayce (South Carolina) | 4,265.10 mi (6,864.01 km) |
| Porsgrunn to Cayey (Puerto Rico) | 4,649.95 mi (7,483.38 km) |
| Porsgrunn to Cedar City (Utah) | 4,993.40 mi (8,036.10 km) |
| Porsgrunn to Cedar Falls (Iowa) | 4,144.25 mi (6,669.53 km) |
| Porsgrunn to Cedar Hill (Texas) | 4,853.17 mi (7,810.42 km) |
| Porsgrunn to Cedar Lake (Indiana) | 4,056.98 mi (6,529.08 km) |
| Porsgrunn to Cedar Mill (Oregon) | 4,720.01 mi (7,596.12 km) |
| Porsgrunn to Cedar Park (Texas) | 5,001.79 mi (8,049.60 km) |
