| Duluth to Castle Pines (Colorado) | 815.33 mi (1,312.14 km) |
| Duluth to Castle Rock (Colorado) | 818.69 mi (1,317.55 km) |
| Duluth to Castro Valley (California) | 1,641.29 mi (2,641.40 km) |
| Duluth to Catalina Foothills (Arizona) | 1,406.20 mi (2,263.06 km) |
| Duluth to Cataño (Puerto Rico) | 2,450.66 mi (3,943.95 km) |
| Duluth to Cathedral City (California) | 1,552.25 mi (2,498.11 km) |
| Duluth to Catonsville (Maryland) | 932.43 mi (1,500.60 km) |
| Duluth to Cave Spring (Virginia) | 905.38 mi (1,457.07 km) |
| Duluth to Cayce (South Carolina) | 1,059.29 mi (1,704.77 km) |
| Duluth to Cayey (Puerto Rico) | 2,469.11 mi (3,973.65 km) |
| Duluth to Cedar City (Utah) | 1,236.90 mi (1,990.60 km) |
| Duluth to Cedar Falls (Iowa) | 294.47 mi (473.91 km) |
| Duluth to Cedar Hill (Texas) | 1,013.17 mi (1,630.54 km) |
| Duluth to Cedar Lake (Indiana) | 440.22 mi (708.46 km) |
| Duluth to Cedar Mill (Oregon) | 1,460.66 mi (2,350.71 km) |
