| Southborough to Chantilly (Virginia) | 3,706.02 mi (5,964.26 km) |
| Southborough to Chaparral (New Mexico) | 5,174.05 mi (8,326.82 km) |
| Southborough to Chapel Hill (North Carolina) | 3,906.91 mi (6,287.57 km) |
| Southborough to Charleston (Illinois) | 4,106.98 mi (6,609.55 km) |
| Southborough to Charleston (South Carolina) | 4,092.68 mi (6,586.53 km) |
| Southborough to Charleston (West Virginia) | 3,900.70 mi (6,277.57 km) |
| Southborough to Charlotte (North Carolina) | 4,014.54 mi (6,460.78 km) |
| Southborough to Charlottesville (Virginia) | 3,786.96 mi (6,094.53 km) |
| Southborough to Chaska (Minnesota) | 4,058.47 mi (6,531.48 km) |
| Southborough to Chatham (Illinois) | 4,156.54 mi (6,689.30 km) |
| Southborough to Chattanooga (Tennessee) | 4,201.83 mi (6,762.20 km) |
| Southborough to Cheat Lake (West Virginia) | 3,768.95 mi (6,065.54 km) |
| Southborough to Chelsea (Alabama) | 4,342.55 mi (6,988.66 km) |
| Southborough to Chelsea (Massachusetts) | 3,292.16 mi (5,298.23 km) |
| Southborough to Cheney (Washington) | 4,691.37 mi (7,550.03 km) |
