| Donostia to Castle Rock (Colorado) | 4,970.82 mi (7,999.76 km) |
| Donostia to Castro Valley (California) | 5,697.79 mi (9,169.70 km) |
| Donostia to Catalina Foothills (Arizona) | 5,552.46 mi (8,935.82 km) |
| Donostia to Cataño (Puerto Rico) | 4,063.89 mi (6,540.21 km) |
| Donostia to Cathedral City (California) | 5,696.04 mi (9,166.90 km) |
| Donostia to Catonsville (Maryland) | 3,758.01 mi (6,047.94 km) |
| Donostia to Cave Spring (Virginia) | 3,982.63 mi (6,409.43 km) |
| Donostia to Cayce (South Carolina) | 4,156.47 mi (6,689.20 km) |
| Donostia to Cayey (Puerto Rico) | 4,079.21 mi (6,564.85 km) |
| Donostia to Cedar City (Utah) | 5,372.83 mi (8,646.74 km) |
| Donostia to Cedar Falls (Iowa) | 4,329.50 mi (6,967.66 km) |
| Donostia to Cedar Hill (Texas) | 4,944.63 mi (7,957.61 km) |
| Donostia to Cedar Lake (Indiana) | 4,160.84 mi (6,696.22 km) |
| Donostia to Cedar Mill (Oregon) | 5,305.60 mi (8,538.55 km) |
| Donostia to Cedar Park (Texas) | 5,076.18 mi (8,169.32 km) |
