| Duncan to Lowell (Indiana) | 737.46 mi (1,186.83 km) |
| Duncan to Lowell (Massachusetts) | 1,533.66 mi (2,468.19 km) |
| Duncan to Lower Burrell (Pennsylvania) | 1,078.42 mi (1,735.55 km) |
| Duncan to Lowes Island (Virginia) | 1,177.01 mi (1,894.21 km) |
| Duncan to Lubbock (Texas) | 236.82 mi (381.13 km) |
| Duncan to Lufkin (Texas) | 289.40 mi (465.74 km) |
| Duncan to Luling (Louisiana) | 546.09 mi (878.85 km) |
| Duncan to Lumberton (North Carolina) | 1,073.69 mi (1,727.93 km) |
| Duncan to Lumberton (Texas) | 366.80 mi (590.31 km) |
| Duncan to Lutz (Florida) | 1,013.08 mi (1,630.40 km) |
| Duncan to Lynbrook (New York) | 1,387.79 mi (2,233.44 km) |
| Duncan to Lynchburg (Virginia) | 1,063.99 mi (1,712.33 km) |
| Duncan to Lynden (Washington) | 1,597.21 mi (2,570.47 km) |
| Duncan to Lyndhurst (Ohio) | 1,013.40 mi (1,630.91 km) |
| Duncan to Lyndon (Kentucky) | 731.75 mi (1,177.64 km) |
