| Southborough to Culpeper (Virginia) | 3,747.47 mi (6,030.96 km) |
| Southborough to Culver City (California) | 5,476.72 mi (8,813.94 km) |
| Southborough to Cumberland (Maryland) | 3,725.25 mi (5,995.21 km) |
| Southborough to Cupertino (California) | 5,398.72 mi (8,688.39 km) |
| Southborough to Cutler Bay (Florida) | 4,464.69 mi (7,185.22 km) |
| Southborough to Cutlerville (Michigan) | 3,854.91 mi (6,203.88 km) |
| Southborough to Cuyahoga Falls (Ohio) | 3,768.32 mi (6,064.53 km) |
| Southborough to Cypress (California) | 5,475.99 mi (8,812.76 km) |
| Southborough to Cypress Gardens (Florida) | 4,400.47 mi (7,081.87 km) |
| Southborough to Cypress Lake (Florida) | 4,482.83 mi (7,214.41 km) |
| Southborough to D'Iberville (Mississippi) | 4,577.01 mi (7,365.98 km) |
| Southborough to Dakota Ridge (Colorado) | 4,724.79 mi (7,603.82 km) |
| Southborough to Dale City (Virginia) | 3,712.70 mi (5,975.01 km) |
| Southborough to Dallas (Georgia) | 4,240.98 mi (6,825.19 km) |
| Southborough to Dallas (Oregon) | 4,993.86 mi (8,036.85 km) |
