| Duncan to Shoreview (Minnesota) | 771.11 mi (1,240.99 km) |
| Duncan to Shorewood (Illinois) | 714.28 mi (1,149.52 km) |
| Duncan to Shorewood (Wisconsin) | 799.37 mi (1,286.46 km) |
| Duncan to Short Hills (New Jersey) | 1,355.12 mi (2,180.86 km) |
| Duncan to Short Pump (Virginia) | 1,151.24 mi (1,852.74 km) |
| Duncan to Show Low (Arizona) | 690.59 mi (1,111.41 km) |
| Duncan to Shreveport (Louisiana) | 277.58 mi (446.72 km) |
| Duncan to Sicklerville (New Jersey) | 1,308.87 mi (2,106.43 km) |
| Duncan to Sidney (Ohio) | 851.58 mi (1,370.48 km) |
| Duncan to Sierra Madre (California) | 1,146.55 mi (1,845.20 km) |
| Duncan to Sierra Vista (Arizona) | 746.08 mi (1,200.71 km) |
| Duncan to Sierra Vista Southeast (Arizona) | 743.14 mi (1,195.97 km) |
| Duncan to Signal Hill (California) | 1,156.58 mi (1,861.34 km) |
| Duncan to Sikeston (Missouri) | 494.59 mi (795.96 km) |
| Duncan to Siloam Springs (Arkansas) | 222.20 mi (357.59 km) |
