| Southborough to Centralia (Illinois) | 4,189.56 mi (6,742.45 km) |
| Southborough to Centralia (Washington) | 4,881.04 mi (7,855.27 km) |
| Southborough to Centreville (Virginia) | 3,707.90 mi (5,967.29 km) |
| Southborough to Ceres (California) | 5,350.14 mi (8,610.22 km) |
| Southborough to Cerritos (California) | 5,474.06 mi (8,809.65 km) |
| Southborough to Chalco (Nebraska) | 4,325.03 mi (6,960.47 km) |
| Southborough to Chalmette (Louisiana) | 4,647.03 mi (7,478.66 km) |
| Southborough to Chambersburg (Pennsylvania) | 3,668.02 mi (5,903.11 km) |
| Southborough to Chamblee (Georgia) | 4,220.38 mi (6,792.04 km) |
| Southborough to Champaign (Illinois) | 4,080.91 mi (6,567.59 km) |
| Southborough to Champlin (Minnesota) | 4,034.02 mi (6,492.12 km) |
| Southborough to Chandler (Arizona) | 5,299.47 mi (8,528.68 km) |
| Southborough to Chanhassen (Minnesota) | 4,054.99 mi (6,525.88 km) |
| Southborough to Channahon (Illinois) | 4,019.10 mi (6,468.12 km) |
| Southborough to Channelview (Texas) | 4,862.02 mi (7,824.66 km) |
