| Round Rock to Cernavoda | 6,236.20 mi (10,036.19 km) |
| Round Rock to Chitila | 6,156.18 mi (9,907.41 km) |
| Round Rock to Cisnadie | 6,034.13 mi (9,711.00 km) |
| Round Rock to Cluj-Napoca | 5,964.84 mi (9,599.49 km) |
| Round Rock to Codlea | 6,080.27 mi (9,785.25 km) |
| Round Rock to Comanesti | 6,079.64 mi (9,784.24 km) |
| Round Rock to Comarnic | 6,108.30 mi (9,830.36 km) |
| Round Rock to Constanta | 6,265.38 mi (10,083.15 km) |
| Round Rock to Corabia | 6,138.21 mi (9,878.49 km) |
| Round Rock to Costesti | 6,109.33 mi (9,832.01 km) |
| Round Rock to Covasna | 6,098.64 mi (9,814.81 km) |
| Round Rock to Craiova | 6,086.90 mi (9,795.92 km) |
| Round Rock to Cristuru Secuiesc | 6,037.72 mi (9,716.77 km) |
| Round Rock to Cugir | 6,000.09 mi (9,656.22 km) |
| Round Rock to Cumpana | 6,265.39 mi (10,083.17 km) |
