| Southborough to Clermont (Florida) | 4,375.63 mi (7,041.90 km) |
| Southborough to Cleveland (Mississippi) | 4,486.68 mi (7,220.62 km) |
| Southborough to Cleveland (Ohio) | 3,760.69 mi (6,052.25 km) |
| Southborough to Cleveland (Tennessee) | 4,180.97 mi (6,728.62 km) |
| Southborough to Cleveland Heights (Ohio) | 3,754.52 mi (6,042.31 km) |
| Southborough to Cliffside Park (New Jersey) | 3,479.47 mi (5,599.67 km) |
| Southborough to Clifton (Colorado) | 4,867.40 mi (7,833.32 km) |
| Southborough to Clifton (New Jersey) | 3,484.67 mi (5,608.03 km) |
| Southborough to Clinton (Iowa) | 4,074.50 mi (6,557.27 km) |
| Southborough to Clinton (Maryland) | 3,690.06 mi (5,938.58 km) |
| Southborough to Clinton (Mississippi) | 4,540.68 mi (7,307.51 km) |
| Southborough to Clinton (Utah) | 4,874.57 mi (7,844.86 km) |
| Southborough to Clive (Iowa) | 4,218.10 mi (6,788.37 km) |
| Southborough to Cloquet (Minnesota) | 3,930.08 mi (6,324.85 km) |
| Southborough to Cloverleaf (Texas) | 4,864.49 mi (7,828.64 km) |
