| Southborough to Cicero (Illinois) | 3,980.29 mi (6,405.66 km) |
| Southborough to Cimarron Hills (Colorado) | 4,749.53 mi (7,643.62 km) |
| Southborough to Cincinnati (Ohio) | 3,978.98 mi (6,403.55 km) |
| Southborough to Cinco Ranch (Texas) | 4,890.36 mi (7,870.27 km) |
| Southborough to Circleville (Ohio) | 3,895.03 mi (6,268.45 km) |
| Southborough to Citrus (California) | 5,454.10 mi (8,777.53 km) |
| Southborough to Citrus Heights (California) | 5,296.39 mi (8,523.71 km) |
| Southborough to Citrus Park (Florida) | 4,434.02 mi (7,135.87 km) |
| Southborough to Claiborne (Louisiana) | 4,605.65 mi (7,412.07 km) |
| Southborough to Claremont (California) | 5,447.93 mi (8,767.59 km) |
| Southborough to Claremont (New Hampshire) | 3,305.12 mi (5,319.08 km) |
| Southborough to Claremore (Oklahoma) | 4,547.94 mi (7,319.20 km) |
| Southborough to Clarksburg (Maryland) | 3,683.58 mi (5,928.14 km) |
| Southborough to Clarksburg (West Virginia) | 3,804.99 mi (6,123.54 km) |
| Southborough to Clarksdale (Mississippi) | 4,457.99 mi (7,174.44 km) |
