| Southborough to Cloverly (Maryland) | 3,677.95 mi (5,919.09 km) |
| Southborough to Clovis (California) | 5,355.40 mi (8,618.68 km) |
| Southborough to Clovis (New Mexico) | 4,928.50 mi (7,931.65 km) |
| Southborough to Clute (Texas) | 4,912.98 mi (7,906.67 km) |
| Southborough to Coachella (California) | 5,421.37 mi (8,724.86 km) |
| Southborough to Coalinga (California) | 5,414.58 mi (8,713.92 km) |
| Southborough to Coamo (Puerto Rico) | 4,244.62 mi (6,831.06 km) |
| Southborough to Coatesville (Pennsylvania) | 3,590.82 mi (5,778.86 km) |
| Southborough to Cockeysville (Maryland) | 3,646.17 mi (5,867.95 km) |
| Southborough to Cocoa (Florida) | 4,342.83 mi (6,989.10 km) |
| Southborough to Cocoa Beach (Florida) | 4,339.34 mi (6,983.49 km) |
| Southborough to Coconut Creek (Florida) | 4,422.87 mi (7,117.92 km) |
| Southborough to Coeur d'Alene (Idaho) | 4,657.54 mi (7,495.59 km) |
| Southborough to Cohoes (New York) | 3,385.62 mi (5,448.63 km) |
| Southborough to Cold Springs (Nevada) | 5,200.10 mi (8,368.75 km) |
