| Duncan to Ukiah (California) | 1,429.06 mi (2,299.84 km) |
| Duncan to Union (Missouri) | 469.57 mi (755.70 km) |
| Duncan to Union City (California) | 1,358.40 mi (2,186.13 km) |
| Duncan to Union City (Georgia) | 766.81 mi (1,234.07 km) |
| Duncan to Union City (New Jersey) | 1,370.69 mi (2,205.91 km) |
| Duncan to Union City (Tennessee) | 515.77 mi (830.06 km) |
| Duncan to Union Hill-Novelty Hill (Washington) | 1,538.21 mi (2,475.51 km) |
| Duncan to Union Park (Florida) | 1,063.90 mi (1,712.18 km) |
| Duncan to Uniondale (New York) | 1,392.61 mi (2,241.19 km) |
| Duncan to Universal City (Texas) | 345.42 mi (555.91 km) |
| Duncan to University (Florida) | 1,015.93 mi (1,634.98 km) |
| Duncan to University City (Missouri) | 508.10 mi (817.71 km) |
| Duncan to University Heights (Ohio) | 1,010.75 mi (1,626.65 km) |
| Duncan to University of California-Santa Barbara (California) | 1,246.92 mi (2,006.73 km) |
| Duncan to University Park (Texas) | 133.57 mi (214.96 km) |
