| Duncan to Sugar Hill (Georgia) | 791.14 mi (1,273.22 km) |
| Duncan to Sugar Land (Texas) | 367.06 mi (590.72 km) |
| Duncan to Sugarland Run (Virginia) | 1,175.57 mi (1,891.90 km) |
| Duncan to Sugarmill Woods (Florida) | 990.56 mi (1,594.14 km) |
| Duncan to Suisun City (California) | 1,359.88 mi (2,188.52 km) |
| Duncan to Suitland (Maryland) | 1,197.86 mi (1,927.78 km) |
| Duncan to Sulphur (Louisiana) | 399.53 mi (642.99 km) |
| Duncan to Sulphur Springs (Texas) | 164.01 mi (263.95 km) |
| Duncan to Summerfield (Maryland) | 1,201.30 mi (1,933.31 km) |
| Duncan to Summerfield (North Carolina) | 1,020.31 mi (1,642.04 km) |
| Duncan to Summerlin South (Nevada) | 986.14 mi (1,587.04 km) |
| Duncan to Summerville (South Carolina) | 1,023.19 mi (1,646.66 km) |
| Duncan to Summit (Illinois) | 742.11 mi (1,194.30 km) |
| Duncan to Summit (New Jersey) | 1,352.92 mi (2,177.31 km) |
| Duncan to Sumner (Washington) | 1,532.50 mi (2,466.32 km) |
