| Rockville to Clemson (South Carolina) | 435.88 mi (701.49 km) |
| Rockville to Clermont (Florida) | 774.38 mi (1,246.25 km) |
| Rockville to Cleveland (Mississippi) | 838.84 mi (1,349.99 km) |
| Rockville to Cleveland (Ohio) | 290.16 mi (466.97 km) |
| Rockville to Cleveland (Tennessee) | 503.00 mi (809.49 km) |
| Rockville to Cleveland Heights (Ohio) | 286.48 mi (461.04 km) |
| Rockville to Cliffside Park (New Jersey) | 206.32 mi (332.04 km) |
| Rockville to Clifton (Colorado) | 1,670.61 mi (2,688.59 km) |
| Rockville to Clifton (New Jersey) | 200.76 mi (323.10 km) |
| Rockville to Clinton (Iowa) | 713.03 mi (1,147.51 km) |
| Rockville to Clinton (Maryland) | 26.65 mi (42.89 km) |
| Rockville to Clinton (Mississippi) | 872.24 mi (1,403.74 km) |
| Rockville to Clinton (Utah) | 1,837.84 mi (2,957.71 km) |
| Rockville to Clive (Iowa) | 892.14 mi (1,435.76 km) |
| Rockville to Cloquet (Minnesota) | 936.06 mi (1,506.44 km) |
