| Duncan to South Fulton (Georgia) | 765.50 mi (1,231.95 km) |
| Duncan to South Gate (California) | 1,156.61 mi (1,861.39 km) |
| Duncan to South Hill (Washington) | 1,531.68 mi (2,465.00 km) |
| Duncan to South Holland (Illinois) | 742.53 mi (1,194.99 km) |
| Duncan to South Houston (Texas) | 372.13 mi (598.89 km) |
| Duncan to South Huntington (New York) | 1,404.31 mi (2,260.02 km) |
| Duncan to South Jordan (Utah) | 873.56 mi (1,405.87 km) |
| Duncan to South Lake Tahoe (California) | 1,255.31 mi (2,020.23 km) |
| Duncan to South Laurel (Maryland) | 1,204.03 mi (1,937.69 km) |
| Duncan to South Lyon (Michigan) | 943.84 mi (1,518.97 km) |
| Duncan to South Miami (Florida) | 1,214.66 mi (1,954.81 km) |
| Duncan to South Miami Heights (Florida) | 1,214.67 mi (1,954.82 km) |
| Duncan to South Milwaukee (Wisconsin) | 791.63 mi (1,274.01 km) |
| Duncan to South Ogden (Utah) | 890.67 mi (1,433.39 km) |
| Duncan to South Pasadena (California) | 1,153.12 mi (1,855.76 km) |
