| Rockville to Carlsbad (California) | 2,258.91 mi (3,635.36 km) |
| Rockville to Carlsbad (New Mexico) | 1,580.67 mi (2,543.84 km) |
| Rockville to Carmel (Indiana) | 482.81 mi (777.00 km) |
| Rockville to Carmichael (California) | 2,352.79 mi (3,786.45 km) |
| Rockville to Carney (Maryland) | 40.46 mi (65.11 km) |
| Rockville to Carnot-Moon (Pennsylvania) | 190.41 mi (306.43 km) |
| Rockville to Carol Stream (Illinois) | 608.45 mi (979.21 km) |
| Rockville to Carolina (Puerto Rico) | 1,577.89 mi (2,539.36 km) |
| Rockville to Carolina Forest (South Carolina) | 380.21 mi (611.88 km) |
| Rockville to Carpentersville (Illinois) | 620.11 mi (997.98 km) |
| Rockville to Carpinteria (California) | 2,346.16 mi (3,775.78 km) |
| Rockville to Carrboro (North Carolina) | 242.50 mi (390.27 km) |
| Rockville to Carroll (Iowa) | 950.13 mi (1,529.09 km) |
| Rockville to Carrollton (Georgia) | 582.02 mi (936.67 km) |
| Rockville to Carrollton (Texas) | 1,177.76 mi (1,895.43 km) |
