| Duncan to Lemay (Missouri) | 505.50 mi (813.52 km) |
| Duncan to Lemon Grove (California) | 1,104.86 mi (1,778.10 km) |
| Duncan to Lemon Hill (California) | 1,331.39 mi (2,142.66 km) |
| Duncan to Lemont (Illinois) | 730.18 mi (1,175.12 km) |
| Duncan to Lemoore (California) | 1,235.13 mi (1,987.75 km) |
| Duncan to Lenexa (Kansas) | 350.79 mi (564.54 km) |
| Duncan to Lennox (California) | 1,166.10 mi (1,876.66 km) |
| Duncan to Lenoir (North Carolina) | 929.17 mi (1,495.35 km) |
| Duncan to Leominster (Massachusetts) | 1,509.54 mi (2,429.37 km) |
| Duncan to Leon Valley (Texas) | 350.95 mi (564.81 km) |
| Duncan to Levelland (Texas) | 262.75 mi (422.85 km) |
| Duncan to Levittown (New York) | 1,396.93 mi (2,248.14 km) |
| Duncan to Levittown (Pennsylvania) | 1,320.72 mi (2,125.50 km) |
| Duncan to Lewisburg (Tennessee) | 632.84 mi (1,018.45 km) |
| Duncan to Lewiston (Idaho) | 1,288.53 mi (2,073.68 km) |
