| Round Lake Beach to Lovington (New Mexico) | 1,057.15 mi (1,701.32 km) |
| Round Lake Beach to Lowell (Indiana) | 82.49 mi (132.76 km) |
| Round Lake Beach to Lowell (Massachusetts) | 852.41 mi (1,371.82 km) |
| Round Lake Beach to Lower Burrell (Pennsylvania) | 450.34 mi (724.75 km) |
| Round Lake Beach to Lowes Island (Virginia) | 606.66 mi (976.32 km) |
| Round Lake Beach to Lubbock (Texas) | 965.47 mi (1,553.78 km) |
| Round Lake Beach to Lufkin (Texas) | 847.08 mi (1,363.24 km) |
| Round Lake Beach to Luling (Louisiana) | 871.34 mi (1,402.28 km) |
| Round Lake Beach to Lumberton (North Carolina) | 724.86 mi (1,166.55 km) |
| Round Lake Beach to Lumberton (Texas) | 903.73 mi (1,454.41 km) |
| Round Lake Beach to Lutz (Florida) | 1,033.29 mi (1,662.92 km) |
| Round Lake Beach to Lynbrook (New York) | 753.79 mi (1,213.11 km) |
| Round Lake Beach to Lynchburg (Virginia) | 582.97 mi (938.19 km) |
| Round Lake Beach to Lynden (Washington) | 1,704.62 mi (2,743.32 km) |
| Round Lake Beach to Lyndhurst (Ohio) | 343.70 mi (553.12 km) |
