| Waltham to Carlsbad (California) | 2,562.16 mi (4,123.40 km) |
| Waltham to Carlsbad (New Mexico) | 1,923.52 mi (3,095.60 km) |
| Waltham to Carmel (Indiana) | 791.84 mi (1,274.34 km) |
| Waltham to Carmichael (California) | 2,605.59 mi (4,193.30 km) |
| Waltham to Carney (Maryland) | 344.24 mi (554.00 km) |
| Waltham to Carnot-Moon (Pennsylvania) | 482.15 mi (775.95 km) |
| Waltham to Carol Stream (Illinois) | 864.25 mi (1,390.88 km) |
| Waltham to Carolina (Puerto Rico) | 1,685.64 mi (2,712.78 km) |
| Waltham to Carolina Forest (South Carolina) | 726.68 mi (1,169.47 km) |
| Waltham to Carpentersville (Illinois) | 870.52 mi (1,400.97 km) |
| Waltham to Carpinteria (California) | 2,635.22 mi (4,240.97 km) |
| Waltham to Carrboro (North Carolina) | 612.71 mi (986.06 km) |
| Waltham to Carroll (Iowa) | 1,204.83 mi (1,938.99 km) |
| Waltham to Carrollton (Georgia) | 966.56 mi (1,555.52 km) |
| Waltham to Carrollton (Texas) | 1,537.88 mi (2,474.98 km) |
