| Southborough to Corinth (Mississippi) | 4,338.96 mi (6,982.87 km) |
| Southborough to Corinth (Texas) | 4,765.50 mi (7,669.33 km) |
| Southborough to Cornelius (North Carolina) | 4,004.18 mi (6,444.10 km) |
| Southborough to Cornelius (Oregon) | 4,952.42 mi (7,970.15 km) |
| Southborough to Corning (New York) | 3,547.11 mi (5,708.53 km) |
| Southborough to Corona (California) | 5,458.13 mi (8,784.02 km) |
| Southborough to Coronado (California) | 5,513.13 mi (8,872.52 km) |
| Southborough to Corpus Christi (Texas) | 5,059.64 mi (8,142.70 km) |
| Southborough to Corsicana (Texas) | 4,796.88 mi (7,719.83 km) |
| Southborough to Cortland (New York) | 3,492.53 mi (5,620.68 km) |
| Southborough to Corvallis (Oregon) | 5,013.28 mi (8,068.09 km) |
| Southborough to Coshocton (Ohio) | 3,821.94 mi (6,150.81 km) |
| Southborough to Costa Mesa (California) | 5,480.54 mi (8,820.08 km) |
| Southborough to Coto de Caza (California) | 5,473.97 mi (8,809.50 km) |
| Southborough to Cottage Grove (Minnesota) | 4,033.98 mi (6,492.06 km) |
