| Port Huron to Cernavoda | 5,039.23 mi (8,109.86 km) |
| Port Huron to Chitila | 4,957.83 mi (7,978.86 km) |
| Port Huron to Cisnadie | 4,835.78 mi (7,782.44 km) |
| Port Huron to Cluj-Napoca | 4,767.26 mi (7,672.17 km) |
| Port Huron to Codlea | 4,882.82 mi (7,858.13 km) |
| Port Huron to Comanesti | 4,884.00 mi (7,860.04 km) |
| Port Huron to Comarnic | 4,910.48 mi (7,902.66 km) |
| Port Huron to Constanta | 5,068.73 mi (8,157.33 km) |
| Port Huron to Corabia | 4,938.43 mi (7,947.64 km) |
| Port Huron to Costesti | 4,910.44 mi (7,902.58 km) |
| Port Huron to Covasna | 4,901.97 mi (7,888.96 km) |
| Port Huron to Craiova | 4,887.20 mi (7,865.19 km) |
| Port Huron to Cristuru Secuiesc | 4,840.66 mi (7,790.29 km) |
| Port Huron to Cugir | 4,801.39 mi (7,727.09 km) |
| Port Huron to Cumpana | 5,068.60 mi (8,157.13 km) |
