| Southborough to Commerce City (Colorado) | 4,701.87 mi (7,566.93 km) |
| Southborough to Compton (California) | 5,477.74 mi (8,815.56 km) |
| Southborough to Comstock Park (Michigan) | 3,845.89 mi (6,189.36 km) |
| Southborough to Concord (California) | 5,359.33 mi (8,625.02 km) |
| Southborough to Concord (Missouri) | 4,237.93 mi (6,820.29 km) |
| Southborough to Concord (New Hampshire) | 3,279.58 mi (5,277.98 km) |
| Southborough to Concord (North Carolina) | 3,997.85 mi (6,433.91 km) |
| Southborough to Conneaut (Ohio) | 3,696.70 mi (5,949.26 km) |
| Southborough to Connersville (Indiana) | 3,980.05 mi (6,405.28 km) |
| Southborough to Conroe (Texas) | 4,849.07 mi (7,803.83 km) |
| Southborough to Converse (Texas) | 5,002.69 mi (8,051.06 km) |
| Southborough to Conway (Arkansas) | 4,488.92 mi (7,224.21 km) |
| Southborough to Conway (Florida) | 4,360.98 mi (7,018.32 km) |
| Southborough to Conway (South Carolina) | 4,005.21 mi (6,445.76 km) |
| Southborough to Conyers (Georgia) | 4,218.56 mi (6,789.11 km) |
