| Duncan to Iselin (New Jersey) | 1,353.52 mi (2,178.28 km) |
| Duncan to Isla Vista (California) | 1,247.20 mi (2,007.18 km) |
| Duncan to Issaquah (Washington) | 1,534.72 mi (2,469.90 km) |
| Duncan to Ithaca (New York) | 1,275.74 mi (2,053.11 km) |
| Duncan to Ives Estates (Florida) | 1,210.61 mi (1,948.28 km) |
| Duncan to Jackson (Michigan) | 903.22 mi (1,453.59 km) |
| Duncan to Jackson (Mississippi) | 470.21 mi (756.72 km) |
| Duncan to Jackson (Missouri) | 502.09 mi (808.04 km) |
| Duncan to Jackson (Tennessee) | 519.17 mi (835.52 km) |
| Duncan to Jackson (Wyoming) | 923.78 mi (1,486.67 km) |
| Duncan to Jacksonville (Alabama) | 696.91 mi (1,121.57 km) |
| Duncan to Jacksonville (Arkansas) | 329.71 mi (530.62 km) |
| Duncan to Jacksonville (Florida) | 989.69 mi (1,592.76 km) |
| Duncan to Jacksonville (Illinois) | 554.52 mi (892.41 km) |
| Duncan to Jacksonville (North Carolina) | 1,165.01 mi (1,874.90 km) |
