| Rockville to Cold Springs (Nevada) | 2,264.96 mi (3,645.10 km) |
| Rockville to Coldwater (Michigan) | 456.79 mi (735.13 km) |
| Rockville to Colesville (Maryland) | 8.31 mi (13.37 km) |
| Rockville to College (Alaska) | 3,258.67 mi (5,244.32 km) |
| Rockville to College Park (Georgia) | 553.73 mi (891.14 km) |
| Rockville to College Park (Maryland) | 13.34 mi (21.46 km) |
| Rockville to College Station (Texas) | 1,230.52 mi (1,980.33 km) |
| Rockville to Collegedale (Tennessee) | 516.35 mi (830.99 km) |
| Rockville to Colleyville (Texas) | 1,193.68 mi (1,921.04 km) |
| Rockville to Collierville (Tennessee) | 744.85 mi (1,198.71 km) |
| Rockville to Collinsville (Illinois) | 691.20 mi (1,112.38 km) |
| Rockville to Colonia (New Jersey) | 183.24 mi (294.90 km) |
| Rockville to Colonial Heights (Virginia) | 126.32 mi (203.30 km) |
| Rockville to Colonial Park (Pennsylvania) | 85.99 mi (138.38 km) |
| Rockville to Colorado Springs (Colorado) | 1,477.12 mi (2,377.19 km) |
