| Porsgrunn to Black Forest (Colorado) | 4,691.39 mi (7,550.06 km) |
| Porsgrunn to Blackfoot (Idaho) | 4,637.54 mi (7,463.41 km) |
| Porsgrunn to Blackhawk (California) | 5,189.98 mi (8,352.46 km) |
| Porsgrunn to Blacksburg (Virginia) | 4,061.68 mi (6,536.65 km) |
| Porsgrunn to Blackwells Mills (New Jersey) | 3,691.53 mi (5,940.95 km) |
| Porsgrunn to Blaine (Minnesota) | 4,017.60 mi (6,465.70 km) |
| Porsgrunn to Bloomingdale (Florida) | 4,650.96 mi (7,485.00 km) |
| Porsgrunn to Bloomingdale (Illinois) | 4,044.82 mi (6,509.50 km) |
| Porsgrunn to Bloomington (California) | 5,323.78 mi (8,567.79 km) |
| Porsgrunn to Bloomington (Illinois) | 4,154.03 mi (6,685.27 km) |
| Porsgrunn to Bloomington (Indiana) | 4,151.26 mi (6,680.82 km) |
| Porsgrunn to Bloomington (Minnesota) | 4,039.63 mi (6,501.15 km) |
| Porsgrunn to Bloomsburg (Pennsylvania) | 3,725.26 mi (5,995.23 km) |
| Porsgrunn to Blue Ash (Ohio) | 4,078.54 mi (6,563.78 km) |
| Porsgrunn to Blue Island (Illinois) | 4,048.46 mi (6,515.37 km) |
