| Duluth to Carlsbad (California) | 1,620.29 mi (2,607.61 km) |
| Duluth to Carlsbad (New Mexico) | 1,180.76 mi (1,900.25 km) |
| Duluth to Carmel (Indiana) | 558.22 mi (898.38 km) |
| Duluth to Carmichael (California) | 1,574.04 mi (2,533.17 km) |
| Duluth to Carney (Maryland) | 935.56 mi (1,505.64 km) |
| Duluth to Carnot-Moon (Pennsylvania) | 734.99 mi (1,182.86 km) |
| Duluth to Carol Stream (Illinois) | 389.58 mi (626.97 km) |
| Duluth to Carolina (Puerto Rico) | 2,458.15 mi (3,956.01 km) |
| Duluth to Carolina Forest (South Carolina) | 1,134.36 mi (1,825.57 km) |
| Duluth to Carpentersville (Illinois) | 373.26 mi (600.70 km) |
| Duluth to Carpinteria (California) | 1,658.90 mi (2,669.74 km) |
| Duluth to Carrboro (North Carolina) | 1,007.36 mi (1,621.20 km) |
| Duluth to Carroll (Iowa) | 351.79 mi (566.15 km) |
| Duluth to Carrollton (Georgia) | 983.74 mi (1,583.17 km) |
| Duluth to Carrollton (Texas) | 984.94 mi (1,585.11 km) |
