| Prospect Heights to Lombard (Illinois) | 16.52 mi (26.59 km) |
| Prospect Heights to Lomita (California) | 1,741.61 mi (2,802.85 km) |
| Prospect Heights to Lompoc (California) | 1,823.73 mi (2,935.01 km) |
| Prospect Heights to London (Ohio) | 279.45 mi (449.73 km) |
| Prospect Heights to Lone Tree (Colorado) | 902.07 mi (1,451.74 km) |
| Prospect Heights to Long Beach (California) | 1,733.85 mi (2,790.36 km) |
| Prospect Heights to Long Beach (Mississippi) | 814.27 mi (1,310.45 km) |
| Prospect Heights to Long Beach (New York) | 746.18 mi (1,200.86 km) |
| Prospect Heights to Long Branch (New Jersey) | 734.27 mi (1,181.69 km) |
| Prospect Heights to Longmont (Colorado) | 902.05 mi (1,451.71 km) |
| Prospect Heights to Longview (Texas) | 760.71 mi (1,224.25 km) |
| Prospect Heights to Longview (Washington) | 1,745.44 mi (2,809.02 km) |
| Prospect Heights to Longwood (Florida) | 996.56 mi (1,603.81 km) |
| Prospect Heights to Lorain (Ohio) | 299.38 mi (481.81 km) |
| Prospect Heights to Lorton (Virginia) | 610.13 mi (981.91 km) |
