| Williamstown to Castle Pines (Colorado) | 1,584.58 mi (2,550.14 km) |
| Williamstown to Castle Rock (Colorado) | 1,584.75 mi (2,550.40 km) |
| Williamstown to Castro Valley (California) | 2,513.29 mi (4,044.75 km) |
| Williamstown to Catalina Foothills (Arizona) | 2,056.15 mi (3,309.05 km) |
| Williamstown to Cataño (Puerto Rico) | 1,560.10 mi (2,510.73 km) |
| Williamstown to Cathedral City (California) | 2,310.74 mi (3,718.77 km) |
| Williamstown to Catonsville (Maryland) | 98.50 mi (158.52 km) |
| Williamstown to Cave Spring (Virginia) | 320.80 mi (516.27 km) |
| Williamstown to Cayce (South Carolina) | 519.23 mi (835.62 km) |
| Williamstown to Cayey (Puerto Rico) | 1,580.93 mi (2,544.27 km) |
| Williamstown to Cedar City (Utah) | 2,044.98 mi (3,291.08 km) |
| Williamstown to Cedar Falls (Iowa) | 928.82 mi (1,494.79 km) |
| Williamstown to Cedar Hill (Texas) | 1,316.84 mi (2,119.24 km) |
| Williamstown to Cedar Lake (Indiana) | 664.00 mi (1,068.61 km) |
| Williamstown to Cedar Mill (Oregon) | 2,428.36 mi (3,908.06 km) |
