| Porsgrunn to Rockville (Maryland) | 3,851.76 mi (6,198.81 km) |
| Porsgrunn to Rockville Centre (New York) | 3,649.46 mi (5,873.25 km) |
| Porsgrunn to Rockwall (Texas) | 4,817.52 mi (7,753.04 km) |
| Porsgrunn to Rocky Mount (North Carolina) | 4,043.91 mi (6,508.04 km) |
| Porsgrunn to Rocky Point (New York) | 3,611.52 mi (5,812.18 km) |
| Porsgrunn to Rocky River (Ohio) | 3,875.67 mi (6,237.29 km) |
| Porsgrunn to Roessleville (New York) | 3,547.59 mi (5,709.30 km) |
| Porsgrunn to Rogers (Arkansas) | 4,549.59 mi (7,321.86 km) |
| Porsgrunn to Rogers (Minnesota) | 4,027.27 mi (6,481.26 km) |
| Porsgrunn to Rohnert Park (California) | 5,173.16 mi (8,325.39 km) |
| Porsgrunn to Rolla (Missouri) | 4,382.88 mi (7,053.56 km) |
| Porsgrunn to Rolling Meadows (Illinois) | 4,035.92 mi (6,495.18 km) |
| Porsgrunn to Roma (Texas) | 5,282.16 mi (8,500.81 km) |
| Porsgrunn to Rome (Georgia) | 4,383.90 mi (7,055.20 km) |
| Porsgrunn to Rome (New York) | 3,575.76 mi (5,754.64 km) |
