| Southborough to Kenosha (Wisconsin) | 3,950.53 mi (6,357.77 km) |
| Southborough to Kent (Ohio) | 3,762.66 mi (6,055.42 km) |
| Southborough to Kent (Washington) | 4,822.94 mi (7,761.77 km) |
| Southborough to Kentwood (Michigan) | 3,849.78 mi (6,195.63 km) |
| Southborough to Kerman (California) | 5,372.98 mi (8,646.97 km) |
| Southborough to Kernersville (North Carolina) | 3,941.63 mi (6,343.45 km) |
| Southborough to Kerrville (Texas) | 5,006.91 mi (8,057.85 km) |
| Southborough to Kettering (Maryland) | 3,679.03 mi (5,920.83 km) |
| Southborough to Kettering (Ohio) | 3,939.18 mi (6,339.50 km) |
| Southborough to Kewanee (Illinois) | 4,091.06 mi (6,583.93 km) |
| Southborough to Key Biscayne (Florida) | 4,451.67 mi (7,164.26 km) |
| Southborough to Key Largo (Florida) | 4,490.84 mi (7,227.31 km) |
| Southborough to Key West (Florida) | 4,577.37 mi (7,366.57 km) |
| Southborough to Keystone (Florida) | 4,432.68 mi (7,133.71 km) |
| Southborough to Kihei (Hawaii) | 7,269.80 mi (11,699.62 km) |
