| San Marino to Blue Island (Illinois) | 1,728.78 mi (2,782.21 km) |
| San Marino to Blue Springs (Missouri) | 1,361.12 mi (2,190.50 km) |
| San Marino to Bluffdale (Utah) | 554.48 mi (892.35 km) |
| San Marino to Bluffton (Indiana) | 1,852.45 mi (2,981.23 km) |
| San Marino to Bluffton (South Carolina) | 2,142.65 mi (3,448.26 km) |
| San Marino to Blythe (California) | 203.37 mi (327.30 km) |
| San Marino to Blytheville (Arkansas) | 1,595.34 mi (2,567.45 km) |
| San Marino to Boca Raton (Florida) | 2,316.63 mi (3,728.26 km) |
| San Marino to Boerne (Texas) | 1,173.18 mi (1,888.05 km) |
| San Marino to Bogalusa (Louisiana) | 1,657.83 mi (2,668.02 km) |
| San Marino to Boiling Springs (South Carolina) | 2,045.21 mi (3,291.45 km) |
| San Marino to Boise (Idaho) | 662.61 mi (1,066.36 km) |
| San Marino to Bolingbrook (Illinois) | 1,707.55 mi (2,748.04 km) |
| San Marino to Bolivar (Missouri) | 1,399.39 mi (2,252.11 km) |
| San Marino to Bon Air (Virginia) | 2,265.92 mi (3,646.65 km) |
