| Williamsport to Castle Pines (Colorado) | 1,464.44 mi (2,356.79 km) |
| Williamsport to Castle Rock (Colorado) | 1,464.99 mi (2,357.67 km) |
| Williamsport to Castro Valley (California) | 2,386.89 mi (3,841.32 km) |
| Williamsport to Catalina Foothills (Arizona) | 1,958.03 mi (3,151.15 km) |
| Williamsport to Cataño (Puerto Rico) | 1,702.00 mi (2,739.11 km) |
| Williamsport to Cathedral City (California) | 2,199.93 mi (3,540.45 km) |
| Williamsport to Catonsville (Maryland) | 137.36 mi (221.06 km) |
| Williamsport to Cave Spring (Virginia) | 319.64 mi (514.42 km) |
| Williamsport to Cayce (South Carolina) | 549.45 mi (884.25 km) |
| Williamsport to Cayey (Puerto Rico) | 1,722.54 mi (2,772.17 km) |
| Williamsport to Cedar City (Utah) | 1,925.19 mi (3,098.30 km) |
| Williamsport to Cedar Falls (Iowa) | 796.87 mi (1,282.44 km) |
| Williamsport to Cedar Hill (Texas) | 1,248.44 mi (2,009.17 km) |
| Williamsport to Cedar Lake (Indiana) | 539.65 mi (868.48 km) |
| Williamsport to Cedar Mill (Oregon) | 2,285.52 mi (3,678.19 km) |
