| Duncan to Port Chester (New York) | 1,392.44 mi (2,240.91 km) |
| Duncan to Port Hueneme (California) | 1,212.03 mi (1,950.57 km) |
| Duncan to Port Huron (Michigan) | 1,015.19 mi (1,633.79 km) |
| Duncan to Port Lavaca (Texas) | 416.23 mi (669.86 km) |
| Duncan to Port Neches (Texas) | 391.59 mi (630.20 km) |
| Duncan to Port Orange (Florida) | 1,059.49 mi (1,705.09 km) |
| Duncan to Port Orchard (Washington) | 1,559.49 mi (2,509.75 km) |
| Duncan to Port Royal (South Carolina) | 1,002.81 mi (1,613.86 km) |
| Duncan to Port Salerno (Florida) | 1,167.05 mi (1,878.18 km) |
| Duncan to Port St. John (Florida) | 1,089.72 mi (1,753.73 km) |
| Duncan to Port St. Lucie (Florida) | 1,151.84 mi (1,853.71 km) |
| Duncan to Port Washington (New York) | 1,389.73 mi (2,236.56 km) |
| Duncan to Port Washington (Wisconsin) | 813.68 mi (1,309.50 km) |
| Duncan to Port Wentworth (Georgia) | 977.28 mi (1,572.78 km) |
| Duncan to Portage (Indiana) | 759.46 mi (1,222.23 km) |
