| Rhondda to Blue Springs (Missouri) | 4,208.22 mi (6,772.48 km) |
| Rhondda to Bluffdale (Utah) | 4,765.70 mi (7,669.66 km) |
| Rhondda to Bluffton (Indiana) | 3,773.58 mi (6,072.98 km) |
| Rhondda to Bluffton (South Carolina) | 4,000.31 mi (6,437.88 km) |
| Rhondda to Blythe (California) | 5,230.20 mi (8,417.20 km) |
| Rhondda to Blytheville (Arkansas) | 4,187.55 mi (6,739.21 km) |
| Rhondda to Boca Raton (Florida) | 4,253.13 mi (6,844.75 km) |
| Rhondda to Boerne (Texas) | 4,847.18 mi (7,800.79 km) |
| Rhondda to Bogalusa (Louisiana) | 4,440.22 mi (7,145.85 km) |
| Rhondda to Boiling Springs (South Carolina) | 3,908.52 mi (6,290.16 km) |
| Rhondda to Boise (Idaho) | 4,734.05 mi (7,618.72 km) |
| Rhondda to Bolingbrook (Illinois) | 3,844.76 mi (6,187.55 km) |
| Rhondda to Bolivar (Missouri) | 4,243.93 mi (6,829.95 km) |
| Rhondda to Bon Air (Virginia) | 3,611.87 mi (5,812.74 km) |
| Rhondda to Bonham (Texas) | 4,551.96 mi (7,325.68 km) |
