| Porsgrunn to Robertsville (New Jersey) | 3,688.72 mi (5,936.42 km) |
| Porsgrunn to Robinson (Texas) | 4,924.79 mi (7,925.69 km) |
| Porsgrunn to Robstown (Texas) | 5,158.52 mi (8,301.84 km) |
| Porsgrunn to Rochester (Michigan) | 3,849.94 mi (6,195.88 km) |
| Porsgrunn to Rochester (Minnesota) | 4,061.00 mi (6,535.55 km) |
| Porsgrunn to Rochester (New Hampshire) | 3,422.42 mi (5,507.85 km) |
| Porsgrunn to Rochester (New York) | 3,648.14 mi (5,871.11 km) |
| Porsgrunn to Rochester Hills (Michigan) | 3,852.29 mi (6,199.66 km) |
| Porsgrunn to Rock Hill (South Carolina) | 4,208.68 mi (6,773.22 km) |
| Porsgrunn to Rock Island (Illinois) | 4,147.41 mi (6,674.62 km) |
| Porsgrunn to Rock Springs (Wyoming) | 4,658.07 mi (7,496.43 km) |
| Porsgrunn to Rockford (Illinois) | 4,057.32 mi (6,529.63 km) |
| Porsgrunn to Rockledge (Florida) | 4,573.67 mi (7,360.62 km) |
| Porsgrunn to Rocklin (California) | 5,112.91 mi (8,228.43 km) |
| Porsgrunn to Rockport (Texas) | 5,125.98 mi (8,249.47 km) |
