| Waltham to Castle Pines (Colorado) | 1,755.59 mi (2,825.34 km) |
| Waltham to Castle Rock (Colorado) | 1,756.52 mi (2,826.85 km) |
| Waltham to Castro Valley (California) | 2,667.17 mi (4,292.40 km) |
| Waltham to Catalina Foothills (Arizona) | 2,263.08 mi (3,642.07 km) |
| Waltham to Cataño (Puerto Rico) | 1,681.71 mi (2,706.45 km) |
| Waltham to Cathedral City (California) | 2,497.50 mi (4,019.34 km) |
| Waltham to Catonsville (Maryland) | 359.44 mi (578.46 km) |
| Waltham to Cave Spring (Virginia) | 585.73 mi (942.65 km) |
| Waltham to Cayce (South Carolina) | 788.67 mi (1,269.25 km) |
| Waltham to Cayey (Puerto Rico) | 1,703.51 mi (2,741.54 km) |
| Waltham to Cedar City (Utah) | 2,215.13 mi (3,564.90 km) |
| Waltham to Cedar Falls (Iowa) | 1,078.52 mi (1,735.71 km) |
| Waltham to Cedar Hill (Texas) | 1,556.04 mi (2,504.21 km) |
| Waltham to Cedar Lake (Indiana) | 834.91 mi (1,343.66 km) |
| Waltham to Cedar Mill (Oregon) | 2,529.02 mi (4,070.07 km) |
