| San Marino to Brown Deer (Wisconsin) | 1,730.84 mi (2,785.52 km) |
| San Marino to Brownsburg (Indiana) | 1,785.33 mi (2,873.20 km) |
| San Marino to Brownsville (Florida) | 2,323.97 mi (3,740.08 km) |
| San Marino to Brownsville (Texas) | 1,353.33 mi (2,177.98 km) |
| San Marino to Brownwood (Texas) | 1,120.65 mi (1,803.50 km) |
| San Marino to Brunswick (Georgia) | 2,130.41 mi (3,428.56 km) |
| San Marino to Brunswick (Ohio) | 2,028.83 mi (3,265.09 km) |
| San Marino to Brushy Creek (Texas) | 1,213.35 mi (1,952.70 km) |
| San Marino to Bryan (Texas) | 1,287.63 mi (2,072.24 km) |
| San Marino to Bryant (Arkansas) | 1,457.70 mi (2,345.93 km) |
| San Marino to Bryn Mawr-Skyway (Washington) | 948.47 mi (1,526.41 km) |
| San Marino to Buckeye (Arizona) | 317.73 mi (511.34 km) |
| San Marino to Buckhall (Virginia) | 2,264.41 mi (3,644.22 km) |
| San Marino to Bucyrus (Ohio) | 1,967.69 mi (3,166.69 km) |
| San Marino to Buda (Texas) | 1,216.37 mi (1,957.56 km) |
