| Portage to Cloverleaf (Texas) | 1,009.56 mi (1,624.72 km) |
| Portage to Cloverly (Maryland) | 498.17 mi (801.72 km) |
| Portage to Clovis (California) | 1,841.92 mi (2,964.29 km) |
| Portage to Clovis (New Mexico) | 1,091.47 mi (1,756.55 km) |
| Portage to Clute (Texas) | 1,062.25 mi (1,709.52 km) |
| Portage to Coachella (California) | 1,754.23 mi (2,823.16 km) |
| Portage to Coalinga (California) | 1,893.16 mi (3,046.75 km) |
| Portage to Coamo (Puerto Rico) | 2,013.76 mi (3,240.83 km) |
| Portage to Coatesville (Pennsylvania) | 530.94 mi (854.47 km) |
| Portage to Cockeysville (Maryland) | 504.38 mi (811.72 km) |
| Portage to Cocoa (Florida) | 992.26 mi (1,596.89 km) |
| Portage to Cocoa Beach (Florida) | 997.72 mi (1,605.68 km) |
| Portage to Coconut Creek (Florida) | 1,141.82 mi (1,837.58 km) |
| Portage to Coeur d'Alene (Idaho) | 1,560.89 mi (2,512.01 km) |
| Portage to Cohoes (New York) | 606.25 mi (975.66 km) |
