| Round Rock to Castelfidardo | 5,729.35 mi (9,220.49 km) |
| Round Rock to Castelfiorentino | 5,618.31 mi (9,041.80 km) |
| Round Rock to Castelfranco di Sopra | 5,641.77 mi (9,079.55 km) |
| Round Rock to Castelfranco di Sotto | 5,605.47 mi (9,021.13 km) |
| Round Rock to Castelfranco Emilia | 5,583.03 mi (8,985.02 km) |
| Round Rock to Castelfranco Veneto | 5,576.57 mi (8,974.62 km) |
| Round Rock to Castellabate | 5,918.56 mi (9,525.01 km) |
| Round Rock to Castellammare del Golfo | 5,922.09 mi (9,530.68 km) |
| Round Rock to Castellammare di Stabia | 5,881.45 mi (9,465.28 km) |
| Round Rock to Castellamonte | 5,416.70 mi (8,717.33 km) |
| Round Rock to Castellana Grotte | 5,984.80 mi (9,631.61 km) |
| Round Rock to Castellaneta | 5,985.95 mi (9,633.46 km) |
| Round Rock to Castellanza | 5,456.60 mi (8,781.55 km) |
| Round Rock to Castellarano | 5,573.22 mi (8,969.24 km) |
| Round Rock to Castelleone | 5,503.66 mi (8,857.29 km) |
