| San Juan to Castle Pines (Colorado) | 2,730.27 mi (4,393.94 km) |
| San Juan to Castle Rock (Colorado) | 2,727.30 mi (4,389.17 km) |
| San Juan to Castro Valley (California) | 3,607.13 mi (5,805.12 km) |
| San Juan to Catalina Foothills (Arizona) | 2,934.94 mi (4,723.33 km) |
| San Juan to Cataño (Puerto Rico) | 6.07 mi (9.77 km) |
| San Juan to Cathedral City (California) | 3,268.36 mi (5,259.92 km) |
| San Juan to Catonsville (Maryland) | 1,577.14 mi (2,538.16 km) |
| San Juan to Cave Spring (Virginia) | 1,551.01 mi (2,496.11 km) |
| San Juan to Cayce (South Carolina) | 1,416.65 mi (2,279.87 km) |
| San Juan to Cayey (Puerto Rico) | 20.70 mi (33.31 km) |
| San Juan to Cedar City (Utah) | 3,122.35 mi (5,024.94 km) |
| San Juan to Cedar Falls (Iowa) | 2,271.94 mi (3,656.34 km) |
| San Juan to Cedar Hill (Texas) | 2,150.48 mi (3,460.86 km) |
| San Juan to Cedar Lake (Indiana) | 2,027.36 mi (3,262.73 km) |
| San Juan to Cedar Mill (Oregon) | 3,721.24 mi (5,988.75 km) |
