| Porsgrunn to Blue Springs (Missouri) | 4,397.75 mi (7,077.50 km) |
| Porsgrunn to Bluffdale (Utah) | 4,793.61 mi (7,714.58 km) |
| Porsgrunn to Bluffton (Indiana) | 4,020.97 mi (6,471.13 km) |
| Porsgrunn to Bluffton (South Carolina) | 4,358.94 mi (7,015.04 km) |
| Porsgrunn to Blythe (California) | 5,282.80 mi (8,501.84 km) |
| Porsgrunn to Blytheville (Arkansas) | 4,440.35 mi (7,146.05 km) |
| Porsgrunn to Boca Raton (Florida) | 4,663.66 mi (7,505.43 km) |
| Porsgrunn to Boerne (Texas) | 5,072.66 mi (8,163.65 km) |
| Porsgrunn to Bogalusa (Louisiana) | 4,735.65 mi (7,621.28 km) |
| Porsgrunn to Boiling Springs (South Carolina) | 4,234.53 mi (6,814.82 km) |
| Porsgrunn to Boise (Idaho) | 4,702.39 mi (7,567.76 km) |
| Porsgrunn to Bolingbrook (Illinois) | 4,059.61 mi (6,533.31 km) |
| Porsgrunn to Bolivar (Missouri) | 4,452.88 mi (7,166.22 km) |
| Porsgrunn to Bon Air (Virginia) | 3,950.88 mi (6,358.32 km) |
| Porsgrunn to Bonham (Texas) | 4,770.58 mi (7,677.51 km) |
