| Boulder City to Castelfidardo | 6,072.90 mi (9,773.38 km) |
| Boulder City to Castelfiorentino | 5,982.20 mi (9,627.42 km) |
| Boulder City to Castelfranco di Sopra | 6,000.36 mi (9,656.65 km) |
| Boulder City to Castelfranco di Sotto | 5,969.86 mi (9,607.57 km) |
| Boulder City to Castelfranco Emilia | 5,933.14 mi (9,548.47 km) |
| Boulder City to Castelfranco Veneto | 5,905.30 mi (9,503.66 km) |
| Boulder City to Castellabate | 6,289.55 mi (10,122.05 km) |
| Boulder City to Castellammare del Golfo | 6,340.09 mi (10,203.39 km) |
| Boulder City to Castellammare di Stabia | 6,251.61 mi (10,060.99 km) |
| Boulder City to Castellamonte | 5,783.23 mi (9,307.21 km) |
| Boulder City to Castellana Grotte | 6,327.64 mi (10,183.35 km) |
| Boulder City to Castellaneta | 6,334.05 mi (10,193.67 km) |
| Boulder City to Castellanza | 5,810.60 mi (9,351.26 km) |
| Boulder City to Castellarano | 5,925.96 mi (9,536.91 km) |
| Boulder City to Castelleone | 5,855.08 mi (9,422.85 km) |
