| Duncan to Somersworth (New Hampshire) | 1,564.70 mi (2,518.14 km) |
| Duncan to Somerton (Arizona) | 973.98 mi (1,567.47 km) |
| Duncan to Somerville (Massachusetts) | 1,541.04 mi (2,480.06 km) |
| Duncan to Somerville (New Jersey) | 1,338.45 mi (2,154.03 km) |
| Duncan to Sonoma (California) | 1,384.46 mi (2,228.08 km) |
| Duncan to Soquel (California) | 1,353.97 mi (2,179.01 km) |
| Duncan to South Bend (Indiana) | 801.47 mi (1,289.85 km) |
| Duncan to South Bradenton (Florida) | 1,030.07 mi (1,657.74 km) |
| Duncan to South Burlington (Vermont) | 1,476.47 mi (2,376.16 km) |
| Duncan to South Charleston (West Virginia) | 936.85 mi (1,507.72 km) |
| Duncan to South Daytona (Florida) | 1,058.27 mi (1,703.13 km) |
| Duncan to South El Monte (California) | 1,147.47 mi (1,846.68 km) |
| Duncan to South Elgin (Illinois) | 731.62 mi (1,177.44 km) |
| Duncan to South Euclid (Ohio) | 1,012.05 mi (1,628.73 km) |
| Duncan to South Farmingdale (New York) | 1,400.21 mi (2,253.42 km) |
