| Round Rock to Cordele (Georgia) | 826.16 mi (1,329.57 km) |
| Round Rock to Corinth (Mississippi) | 612.85 mi (986.28 km) |
| Round Rock to Corinth (Texas) | 184.13 mi (296.33 km) |
| Round Rock to Cornelius (North Carolina) | 1,029.17 mi (1,656.29 km) |
| Round Rock to Cornelius (Oregon) | 1,714.43 mi (2,759.11 km) |
| Round Rock to Corning (New York) | 1,394.03 mi (2,243.48 km) |
| Round Rock to Corona (California) | 1,184.19 mi (1,905.77 km) |
| Round Rock to Coronado (California) | 1,155.18 mi (1,859.09 km) |
| Round Rock to Corpus Christi (Texas) | 194.35 mi (312.77 km) |
| Round Rock to Corsicana (Texas) | 128.64 mi (207.02 km) |
| Round Rock to Cortland (New York) | 1,448.33 mi (2,330.86 km) |
| Round Rock to Corvallis (Oregon) | 1,694.22 mi (2,726.59 km) |
| Round Rock to Coshocton (Ohio) | 1,113.31 mi (1,791.71 km) |
| Round Rock to Costa Mesa (California) | 1,202.88 mi (1,935.85 km) |
| Round Rock to Coto de Caza (California) | 1,183.70 mi (1,904.98 km) |
