| Duncan to Troy (Michigan) | 970.31 mi (1,561.57 km) |
| Duncan to Troy (Missouri) | 491.37 mi (790.79 km) |
| Duncan to Troy (New York) | 1,419.27 mi (2,284.09 km) |
| Duncan to Troy (Ohio) | 842.44 mi (1,355.77 km) |
| Duncan to Truckee (California) | 1,269.78 mi (2,043.52 km) |
| Duncan to Trujillo Alto (Puerto Rico) | 2,254.09 mi (3,627.61 km) |
| Duncan to Trumbull Center (Connecticut) | 1,420.29 mi (2,285.73 km) |
| Duncan to Trussville (Alabama) | 651.50 mi (1,048.49 km) |
| Duncan to Tualatin (Oregon) | 1,505.22 mi (2,422.42 km) |
| Duncan to Tuckahoe (Virginia) | 1,152.75 mi (1,855.17 km) |
| Duncan to Tucker (Georgia) | 784.93 mi (1,263.23 km) |
| Duncan to Tucson (Arizona) | 765.23 mi (1,231.51 km) |
| Duncan to Tucson Estates (Arizona) | 778.70 mi (1,253.20 km) |
| Duncan to Tucson Mountains (Arizona) | 774.03 mi (1,245.68 km) |
| Duncan to Tukwila (Washington) | 1,541.98 mi (2,481.57 km) |
