| Duncan to South Plainfield (New Jersey) | 1,348.53 mi (2,170.24 km) |
| Duncan to South Portland (Maine) | 1,599.90 mi (2,574.79 km) |
| Duncan to South Riding (Virginia) | 1,167.05 mi (1,878.18 km) |
| Duncan to South River (New Jersey) | 1,348.84 mi (2,170.75 km) |
| Duncan to South Salt Lake (Utah) | 873.98 mi (1,406.54 km) |
| Duncan to South San Francisco (California) | 1,380.46 mi (2,221.63 km) |
| Duncan to South San Jose Hills (California) | 1,139.62 mi (1,834.04 km) |
| Duncan to South Sioux City (Nebraska) | 553.37 mi (890.56 km) |
| Duncan to South St. Paul (Minnesota) | 760.12 mi (1,223.30 km) |
| Duncan to South Valley (New Mexico) | 498.07 mi (801.57 km) |
| Duncan to South Venice (Florida) | 1,054.24 mi (1,696.63 km) |
| Duncan to South Whittier (California) | 1,147.55 mi (1,846.80 km) |
| Duncan to South Yarmouth (Massachusetts) | 1,577.54 mi (2,538.81 km) |
| Duncan to Southaven (Mississippi) | 451.71 mi (726.96 km) |
| Duncan to Southchase (Florida) | 1,061.48 mi (1,708.29 km) |
