| Prospect Heights to Los Alamitos (California) | 1,728.42 mi (2,781.62 km) |
| Prospect Heights to Los Alamos (New Mexico) | 1,072.35 mi (1,725.78 km) |
| Prospect Heights to Los Altos (California) | 1,832.17 mi (2,948.59 km) |
| Prospect Heights to Los Angeles (California) | 1,735.77 mi (2,793.45 km) |
| Prospect Heights to Los Banos (California) | 1,775.46 mi (2,857.33 km) |
| Prospect Heights to Los Gatos (California) | 1,828.42 mi (2,942.56 km) |
| Prospect Heights to Los Lunas (New Mexico) | 1,134.32 mi (1,825.52 km) |
| Prospect Heights to Los Osos (California) | 1,822.56 mi (2,933.13 km) |
| Prospect Heights to Loudoun Valley Estates (Virginia) | 587.81 mi (945.98 km) |
| Prospect Heights to Louisville (Colorado) | 907.71 mi (1,460.82 km) |
| Prospect Heights to Louisville (Kentucky) | 297.46 mi (478.71 km) |
| Prospect Heights to Lovejoy (Georgia) | 629.89 mi (1,013.71 km) |
| Prospect Heights to Loveland (Colorado) | 896.07 mi (1,442.08 km) |
| Prospect Heights to Loveland (Ohio) | 273.88 mi (440.77 km) |
| Prospect Heights to Loves Park (Illinois) | 57.10 mi (91.89 km) |
