| Rockville to Cloverleaf (Texas) | 1,207.57 mi (1,943.40 km) |
| Rockville to Cloverly (Maryland) | 8.50 mi (13.69 km) |
| Rockville to Clovis (California) | 2,300.96 mi (3,703.04 km) |
| Rockville to Clovis (New Mexico) | 1,471.13 mi (2,367.56 km) |
| Rockville to Clute (Texas) | 1,250.54 mi (2,012.54 km) |
| Rockville to Coachella (California) | 2,183.33 mi (3,513.74 km) |
| Rockville to Coalinga (California) | 2,349.30 mi (3,780.83 km) |
| Rockville to Coamo (Puerto Rico) | 1,589.32 mi (2,557.77 km) |
| Rockville to Coatesville (Pennsylvania) | 94.56 mi (152.19 km) |
| Rockville to Cockeysville (Maryland) | 39.29 mi (63.23 km) |
| Rockville to Cocoa (Florida) | 767.78 mi (1,235.62 km) |
| Rockville to Cocoa Beach (Florida) | 768.96 mi (1,237.53 km) |
| Rockville to Coconut Creek (Florida) | 901.81 mi (1,451.33 km) |
| Rockville to Coeur d'Alene (Idaho) | 2,052.30 mi (3,302.86 km) |
| Rockville to Cohoes (New York) | 312.00 mi (502.12 km) |
