| Porsgrunn to Bougival | 770.98 mi (1,240.77 km) |
| Porsgrunn to Bouguenais | 946.22 mi (1,522.80 km) |
| Porsgrunn to Boulogne-Billancourt | 771.31 mi (1,241.30 km) |
| Porsgrunn to Boulogne-sur-Mer | 661.73 mi (1,064.95 km) |
| Porsgrunn to Bourg-de-Peage | 992.01 mi (1,596.48 km) |
| Porsgrunn to Bourg-en-Bresse | 911.04 mi (1,466.17 km) |
| Porsgrunn to Bourg-la-Reine | 773.76 mi (1,245.25 km) |
| Porsgrunn to Bourg-les-Valence | 999.44 mi (1,608.45 km) |
| Porsgrunn to Bourges | 883.66 mi (1,422.11 km) |
| Porsgrunn to Bourgoin-Jallieu | 952.84 mi (1,533.45 km) |
| Porsgrunn to Bressuire | 945.92 mi (1,522.31 km) |
| Porsgrunn to Brest | 937.08 mi (1,508.08 km) |
| Porsgrunn to Bretigny-sur-Orge | 784.84 mi (1,263.08 km) |
| Porsgrunn to Breuillet | 789.87 mi (1,271.16 km) |
| Porsgrunn to Briancon | 990.90 mi (1,594.69 km) |
