| Waltham to Cibolo (Texas) | 1,737.80 mi (2,796.73 km) |
| Waltham to Cicero (Illinois) | 846.03 mi (1,361.56 km) |
| Waltham to Cimarron Hills (Colorado) | 1,759.87 mi (2,832.23 km) |
| Waltham to Cincinnati (Ohio) | 728.55 mi (1,172.49 km) |
| Waltham to Cinco Ranch (Texas) | 1,615.33 mi (2,599.62 km) |
| Waltham to Circleville (Ohio) | 638.63 mi (1,027.78 km) |
| Waltham to Citrus (California) | 2,561.34 mi (4,122.08 km) |
| Waltham to Citrus Heights (California) | 2,602.04 mi (4,187.58 km) |
| Waltham to Citrus Park (Florida) | 1,175.08 mi (1,891.11 km) |
| Waltham to Claiborne (Louisiana) | 1,330.26 mi (2,140.84 km) |
| Waltham to Claremont (California) | 2,552.17 mi (4,107.32 km) |
| Waltham to Claremont (New Hampshire) | 88.03 mi (141.68 km) |
| Waltham to Claremore (Oklahoma) | 1,362.31 mi (2,192.42 km) |
| Waltham to Clarksburg (Maryland) | 383.30 mi (616.86 km) |
| Waltham to Clarksburg (West Virginia) | 520.49 mi (837.65 km) |
