| Boulder to Los Alamos (New Mexico) | 291.00 mi (468.31 km) |
| Boulder to Los Altos (California) | 925.18 mi (1,488.94 km) |
| Boulder to Los Angeles (California) | 831.02 mi (1,337.39 km) |
| Boulder to Los Banos (California) | 865.64 mi (1,393.11 km) |
| Boulder to Los Gatos (California) | 920.59 mi (1,481.54 km) |
| Boulder to Los Lunas (New Mexico) | 369.82 mi (595.16 km) |
| Boulder to Los Osos (California) | 910.39 mi (1,465.14 km) |
| Boulder to Loudoun Valley Estates (Virginia) | 1,475.08 mi (2,373.92 km) |
| Boulder to Louisville (Colorado) | 6.83 mi (11.00 km) |
| Boulder to Louisville (Kentucky) | 1,056.86 mi (1,700.85 km) |
| Boulder to Lovejoy (Georgia) | 1,241.48 mi (1,997.97 km) |
| Boulder to Loveland (Colorado) | 28.87 mi (46.46 km) |
| Boulder to Loveland (Ohio) | 1,114.77 mi (1,794.05 km) |
| Boulder to Loves Park (Illinois) | 858.85 mi (1,382.18 km) |
| Boulder to Lovington (New Mexico) | 502.86 mi (809.27 km) |
