| Round Lake Beach to Los Alamitos (California) | 1,723.87 mi (2,774.29 km) |
| Round Lake Beach to Los Alamos (New Mexico) | 1,070.75 mi (1,723.21 km) |
| Round Lake Beach to Los Altos (California) | 1,823.98 mi (2,935.41 km) |
| Round Lake Beach to Los Angeles (California) | 1,730.87 mi (2,785.57 km) |
| Round Lake Beach to Los Banos (California) | 1,767.77 mi (2,844.95 km) |
| Round Lake Beach to Los Gatos (California) | 1,820.36 mi (2,929.58 km) |
| Round Lake Beach to Los Lunas (New Mexico) | 1,133.66 mi (1,824.45 km) |
| Round Lake Beach to Los Osos (California) | 1,816.11 mi (2,922.75 km) |
| Round Lake Beach to Loudoun Valley Estates (Virginia) | 601.41 mi (967.87 km) |
| Round Lake Beach to Louisville (Colorado) | 901.24 mi (1,450.40 km) |
| Round Lake Beach to Louisville (Kentucky) | 318.03 mi (511.83 km) |
| Round Lake Beach to Lovejoy (Georgia) | 650.45 mi (1,046.80 km) |
| Round Lake Beach to Loveland (Colorado) | 888.97 mi (1,430.66 km) |
| Round Lake Beach to Loveland (Ohio) | 292.94 mi (471.44 km) |
| Round Lake Beach to Loves Park (Illinois) | 46.88 mi (75.45 km) |
