| Duluth to Castelfidardo | 4,731.31 mi (7,614.32 km) |
| Duluth to Castelfiorentino | 4,632.18 mi (7,454.77 km) |
| Duluth to Castelfranco di Sopra | 4,652.44 mi (7,487.38 km) |
| Duluth to Castelfranco di Sotto | 4,619.56 mi (7,434.47 km) |
| Duluth to Castelfranco Emilia | 4,587.92 mi (7,383.55 km) |
| Duluth to Castelfranco Veneto | 4,568.37 mi (7,352.08 km) |
| Duluth to Castellabate | 4,939.21 mi (7,948.90 km) |
| Duluth to Castellammare del Golfo | 4,974.48 mi (8,005.65 km) |
| Duluth to Castellammare di Stabia | 4,901.29 mi (7,887.87 km) |
| Duluth to Castellamonte | 4,430.76 mi (7,130.61 km) |
| Duluth to Castellana Grotte | 4,988.32 mi (8,027.92 km) |
| Duluth to Castellaneta | 4,992.70 mi (8,034.97 km) |
| Duluth to Castellanza | 4,462.95 mi (7,182.43 km) |
| Duluth to Castellarano | 4,579.68 mi (7,370.29 km) |
| Duluth to Castelleone | 4,508.76 mi (7,256.15 km) |
