| Southborough to Clarkston (Georgia) | 4,221.42 mi (6,793.71 km) |
| Southborough to Clarksville (Indiana) | 4,067.33 mi (6,545.74 km) |
| Southborough to Clarksville (Tennessee) | 4,213.39 mi (6,780.79 km) |
| Southborough to Clawson (Michigan) | 3,771.08 mi (6,068.97 km) |
| Southborough to Clay (Alabama) | 4,323.62 mi (6,958.19 km) |
| Southborough to Clayton (California) | 5,359.06 mi (8,624.58 km) |
| Southborough to Clayton (Missouri) | 4,230.47 mi (6,808.29 km) |
| Southborough to Clayton (North Carolina) | 3,895.01 mi (6,268.41 km) |
| Southborough to Clayton (Ohio) | 3,938.29 mi (6,338.07 km) |
| Southborough to Clearfield (Utah) | 4,875.22 mi (7,845.90 km) |
| Southborough to Clearlake (California) | 5,320.53 mi (8,562.57 km) |
| Southborough to Clearwater (Florida) | 4,447.12 mi (7,156.95 km) |
| Southborough to Cleburne (Texas) | 4,819.51 mi (7,756.26 km) |
| Southborough to Clemmons (North Carolina) | 3,957.53 mi (6,369.04 km) |
| Southborough to Clemson (South Carolina) | 4,120.94 mi (6,632.01 km) |
