| Prospect Heights to Lovington (New Mexico) | 1,053.55 mi (1,695.53 km) |
| Prospect Heights to Lowell (Indiana) | 61.92 mi (99.65 km) |
| Prospect Heights to Lowell (Massachusetts) | 847.06 mi (1,363.20 km) |
| Prospect Heights to Lower Burrell (Pennsylvania) | 438.61 mi (705.87 km) |
| Prospect Heights to Lowes Island (Virginia) | 593.26 mi (954.76 km) |
| Prospect Heights to Lubbock (Texas) | 961.42 mi (1,547.25 km) |
| Prospect Heights to Lufkin (Texas) | 834.09 mi (1,342.34 km) |
| Prospect Heights to Luling (Louisiana) | 853.88 mi (1,374.18 km) |
| Prospect Heights to Lumberton (North Carolina) | 705.92 mi (1,136.07 km) |
| Prospect Heights to Lumberton (Texas) | 889.71 mi (1,431.86 km) |
| Prospect Heights to Lutz (Florida) | 1,012.73 mi (1,629.83 km) |
| Prospect Heights to Lynbrook (New York) | 744.72 mi (1,198.51 km) |
| Prospect Heights to Lynchburg (Virginia) | 566.05 mi (910.97 km) |
| Prospect Heights to Lynden (Washington) | 1,720.43 mi (2,768.76 km) |
| Prospect Heights to Lyndhurst (Ohio) | 333.76 mi (537.13 km) |
