| Duncan to Shelton (Connecticut) | 1,423.45 mi (2,290.82 km) |
| Duncan to Shelton (Washington) | 1,569.71 mi (2,526.21 km) |
| Duncan to Shenandoah (Louisiana) | 494.22 mi (795.37 km) |
| Duncan to Shepherdsville (Kentucky) | 720.47 mi (1,159.49 km) |
| Duncan to Sheridan (Wyoming) | 855.15 mi (1,376.23 km) |
| Duncan to Sherman (Texas) | 97.53 mi (156.96 km) |
| Duncan to Sherrelwood (Colorado) | 534.32 mi (859.91 km) |
| Duncan to Sherwood (Arkansas) | 325.52 mi (523.87 km) |
| Duncan to Sherwood (Oregon) | 1,507.85 mi (2,426.66 km) |
| Duncan to Shiloh (Illinois) | 523.44 mi (842.40 km) |
| Duncan to Shiloh (Ohio) | 835.89 mi (1,345.24 km) |
| Duncan to Shiloh (Pennsylvania) | 1,217.65 mi (1,959.61 km) |
| Duncan to Shirley (New York) | 1,430.63 mi (2,302.38 km) |
| Duncan to Shively (Kentucky) | 718.74 mi (1,156.70 km) |
| Duncan to Shoreline (Washington) | 1,553.65 mi (2,500.36 km) |
