| Royston to Port Chester (New York) | 3,427.47 mi (5,515.98 km) |
| Royston to Port Hueneme (California) | 5,442.93 mi (8,759.55 km) |
| Royston to Port Huron (Michigan) | 3,686.02 mi (5,932.07 km) |
| Royston to Port Lavaca (Texas) | 4,947.49 mi (7,962.21 km) |
| Royston to Port Neches (Texas) | 4,771.10 mi (7,678.34 km) |
| Royston to Port Orange (Florida) | 4,291.71 mi (6,906.83 km) |
| Royston to Port Orchard (Washington) | 4,771.25 mi (7,678.58 km) |
| Royston to Port Royal (South Carolina) | 4,117.63 mi (6,626.68 km) |
| Royston to Port Salerno (Florida) | 4,356.35 mi (7,010.86 km) |
| Royston to Port St. John (Florida) | 4,315.07 mi (6,944.44 km) |
| Royston to Port St. Lucie (Florida) | 4,357.90 mi (7,013.36 km) |
| Royston to Port Washington (New York) | 3,435.61 mi (5,529.08 km) |
| Royston to Port Washington (Wisconsin) | 3,873.61 mi (6,233.97 km) |
| Royston to Port Wentworth (Georgia) | 4,145.89 mi (6,672.17 km) |
| Royston to Portage (Indiana) | 3,931.11 mi (6,326.51 km) |
