| Rancho Santa Margarita to Buena Park (California) | 28.04 mi (45.12 km) |
| Rancho Santa Margarita to Buenaventura Lakes (Florida) | 2,166.72 mi (3,487.01 km) |
| Rancho Santa Margarita to Buffalo (Minnesota) | 1,488.72 mi (2,395.87 km) |
| Rancho Santa Margarita to Buffalo (New York) | 2,176.07 mi (3,502.04 km) |
| Rancho Santa Margarita to Buffalo Grove (Illinois) | 1,709.64 mi (2,751.40 km) |
| Rancho Santa Margarita to Buford (Georgia) | 1,919.44 mi (3,089.04 km) |
| Rancho Santa Margarita to Bull Run (Virginia) | 2,244.43 mi (3,612.06 km) |
| Rancho Santa Margarita to Bullhead City (Arizona) | 202.18 mi (325.38 km) |
| Rancho Santa Margarita to Burbank (California) | 56.60 mi (91.08 km) |
| Rancho Santa Margarita to Burbank (Illinois) | 1,714.42 mi (2,759.09 km) |
| Rancho Santa Margarita to Burien (Washington) | 987.90 mi (1,589.87 km) |
| Rancho Santa Margarita to Burkburnett (Texas) | 1,090.88 mi (1,755.60 km) |
| Rancho Santa Margarita to Burke (Virginia) | 2,258.26 mi (3,634.32 km) |
| Rancho Santa Margarita to Burke Centre (Virginia) | 2,256.24 mi (3,631.06 km) |
| Rancho Santa Margarita to Burleson (Texas) | 1,173.91 mi (1,889.23 km) |
