| Boulder to Land O' Lakes (Florida) | 1,531.94 mi (2,465.42 km) |
| Boulder to Landover (Maryland) | 1,508.32 mi (2,427.41 km) |
| Boulder to Langley Park (Maryland) | 1,502.49 mi (2,418.02 km) |
| Boulder to Lanham (Maryland) | 1,510.17 mi (2,430.39 km) |
| Boulder to Lansdale (Pennsylvania) | 1,575.69 mi (2,535.83 km) |
| Boulder to Lansdowne (Pennsylvania) | 1,579.43 mi (2,541.85 km) |
| Boulder to Lansdowne (Virginia) | 1,474.72 mi (2,373.34 km) |
| Boulder to Lansing (Illinois) | 930.60 mi (1,497.65 km) |
| Boulder to Lansing (Kansas) | 553.34 mi (890.51 km) |
| Boulder to Lansing (Michigan) | 1,086.06 mi (1,747.84 km) |
| Boulder to Lantana (Florida) | 1,716.57 mi (2,762.56 km) |
| Boulder to Lantana (Texas) | 657.47 mi (1,058.10 km) |
| Boulder to Laplace (Louisiana) | 1,079.70 mi (1,737.61 km) |
| Boulder to Laramie (Wyoming) | 90.73 mi (146.02 km) |
| Boulder to Laredo (Texas) | 921.93 mi (1,483.71 km) |
