| Duncan to Lomita (California) | 1,165.17 mi (1,875.16 km) |
| Duncan to Lompoc (California) | 1,279.80 mi (2,059.63 km) |
| Duncan to London (Ohio) | 877.15 mi (1,411.64 km) |
| Duncan to Lone Tree (Colorado) | 515.24 mi (829.19 km) |
| Duncan to Long Beach (California) | 1,156.57 mi (1,861.32 km) |
| Duncan to Long Beach (Mississippi) | 586.22 mi (943.44 km) |
| Duncan to Long Beach (New York) | 1,387.40 mi (2,232.80 km) |
| Duncan to Long Branch (New Jersey) | 1,367.19 mi (2,200.27 km) |
| Duncan to Longmont (Colorado) | 553.39 mi (890.60 km) |
| Duncan to Longview (Texas) | 229.36 mi (369.13 km) |
| Duncan to Longview (Washington) | 1,533.43 mi (2,467.82 km) |
| Duncan to Longwood (Florida) | 1,053.54 mi (1,695.50 km) |
| Duncan to Lorain (Ohio) | 978.46 mi (1,574.69 km) |
| Duncan to Lorton (Virginia) | 1,180.77 mi (1,900.26 km) |
| Duncan to Los Alamitos (California) | 1,150.45 mi (1,851.47 km) |
