| Porsgrunn to Joliet (Illinois) | 4,070.60 mi (6,550.99 km) |
| Porsgrunn to Jonesboro (Arkansas) | 4,470.97 mi (7,195.32 km) |
| Porsgrunn to Joplin (Missouri) | 4,516.26 mi (7,268.22 km) |
| Porsgrunn to Joppatowne (Maryland) | 3,806.90 mi (6,126.62 km) |
| Porsgrunn to Juana Díaz (Puerto Rico) | 4,665.65 mi (7,508.63 km) |
| Porsgrunn to Junction City (Kansas) | 4,473.00 mi (7,198.60 km) |
| Porsgrunn to Juneau (Alaska) | 4,079.25 mi (6,564.92 km) |
| Porsgrunn to Jupiter (Florida) | 4,632.55 mi (7,455.37 km) |
| Porsgrunn to Jupiter Farms (Florida) | 4,636.07 mi (7,461.03 km) |
| Porsgrunn to Jurupa Valley (California) | 5,329.15 mi (8,576.43 km) |
| Porsgrunn to Justice (Illinois) | 4,048.10 mi (6,514.78 km) |
| Porsgrunn to Kahului (Hawaii) | 6,854.39 mi (11,031.08 km) |
| Porsgrunn to Kailua (Hawaii) | 6,828.46 mi (10,989.35 km) |
| Porsgrunn to Kalamazoo (Michigan) | 3,949.66 mi (6,356.37 km) |
| Porsgrunn to Kalispell (Montana) | 4,377.34 mi (7,044.65 km) |
