| South Portland to Conyers (Georgia) | 1,008.08 mi (1,622.35 km) |
| South Portland to Cookeville (Tennessee) | 956.04 mi (1,538.60 km) |
| South Portland to Coolidge (Arizona) | 2,328.26 mi (3,746.98 km) |
| South Portland to Coon Rapids (Minnesota) | 1,137.43 mi (1,830.52 km) |
| South Portland to Cooper City (Florida) | 1,338.31 mi (2,153.81 km) |
| South Portland to Coos Bay (Oregon) | 2,654.08 mi (4,271.32 km) |
| South Portland to Copiague (New York) | 258.98 mi (416.80 km) |
| South Portland to Coppell (Texas) | 1,614.71 mi (2,598.63 km) |
| South Portland to Copperas Cove (Texas) | 1,733.80 mi (2,790.29 km) |
| South Portland to Coral Gables (Florida) | 1,359.91 mi (2,188.56 km) |
| South Portland to Coral Springs (Florida) | 1,323.37 mi (2,129.75 km) |
| South Portland to Coral Terrace (Florida) | 1,357.95 mi (2,185.40 km) |
| South Portland to Coralville (Iowa) | 1,087.70 mi (1,750.48 km) |
| South Portland to Coram (New York) | 235.33 mi (378.73 km) |
| South Portland to Corcoran (California) | 2,625.27 mi (4,224.96 km) |
