| Waltham to Cadillac (Michigan) | 723.05 mi (1,163.64 km) |
| Waltham to Caguas (Puerto Rico) | 1,696.84 mi (2,730.79 km) |
| Waltham to Cahokia (Illinois) | 1,027.32 mi (1,653.31 km) |
| Waltham to Calabasas (California) | 2,600.40 mi (4,184.93 km) |
| Waltham to Caldwell (Idaho) | 2,267.05 mi (3,648.46 km) |
| Waltham to Caledonia (Wisconsin) | 845.18 mi (1,360.18 km) |
| Waltham to Calera (Alabama) | 1,058.67 mi (1,703.76 km) |
| Waltham to Calexico (California) | 2,485.32 mi (3,999.74 km) |
| Waltham to Calhoun (Georgia) | 918.50 mi (1,478.19 km) |
| Waltham to California (Maryland) | 395.38 mi (636.30 km) |
| Waltham to California City (California) | 2,528.48 mi (4,069.20 km) |
| Waltham to Callaway (Florida) | 1,159.87 mi (1,866.64 km) |
| Waltham to Calumet City (Illinois) | 837.77 mi (1,348.27 km) |
| Waltham to Calverton (Maryland) | 377.03 mi (606.77 km) |
| Waltham to Camano (Washington) | 2,475.15 mi (3,983.37 km) |
