| Rockville to Channelview (Texas) | 1,204.66 mi (1,938.71 km) |
| Rockville to Chantilly (Virginia) | 20.67 mi (33.26 km) |
| Rockville to Chaparral (New Mexico) | 1,706.06 mi (2,745.64 km) |
| Rockville to Chapel Hill (North Carolina) | 241.27 mi (388.29 km) |
| Rockville to Charleston (Illinois) | 589.78 mi (949.15 km) |
| Rockville to Charleston (South Carolina) | 460.62 mi (741.29 km) |
| Rockville to Charleston (West Virginia) | 246.61 mi (396.88 km) |
| Rockville to Charlotte (North Carolina) | 335.57 mi (540.04 km) |
| Rockville to Charlottesville (Virginia) | 101.91 mi (164.02 km) |
| Rockville to Chaska (Minnesota) | 931.42 mi (1,498.97 km) |
| Rockville to Chatham (Illinois) | 670.32 mi (1,078.77 km) |
| Rockville to Chattanooga (Tennessee) | 525.10 mi (845.07 km) |
| Rockville to Cheat Lake (West Virginia) | 149.79 mi (241.06 km) |
| Rockville to Chelsea (Alabama) | 660.63 mi (1,063.18 km) |
| Rockville to Chelsea (Massachusetts) | 393.69 mi (633.58 km) |
