| Southborough to Port Chester (New York) | 3,458.53 mi (5,565.97 km) |
| Southborough to Port Hueneme (California) | 5,493.53 mi (8,840.98 km) |
| Southborough to Port Huron (Michigan) | 3,723.65 mi (5,992.63 km) |
| Southborough to Port Lavaca (Texas) | 4,983.13 mi (8,019.57 km) |
| Southborough to Port Neches (Texas) | 4,805.90 mi (7,734.35 km) |
| Southborough to Port Orange (Florida) | 4,317.26 mi (6,947.96 km) |
| Southborough to Port Orchard (Washington) | 4,827.42 mi (7,768.99 km) |
| Southborough to Port Royal (South Carolina) | 4,145.54 mi (6,671.60 km) |
| Southborough to Port Salerno (Florida) | 4,379.78 mi (7,048.58 km) |
| Southborough to Port St. John (Florida) | 4,339.99 mi (6,984.55 km) |
| Southborough to Port St. Lucie (Florida) | 4,381.58 mi (7,051.48 km) |
| Southborough to Port Washington (New York) | 3,466.50 mi (5,578.80 km) |
| Southborough to Port Washington (Wisconsin) | 3,914.25 mi (6,299.38 km) |
| Southborough to Port Wentworth (Georgia) | 4,174.01 mi (6,717.42 km) |
| Southborough to Portage (Indiana) | 3,970.06 mi (6,389.20 km) |
