| South Portland to Central Point (Oregon) | 2,614.88 mi (4,208.25 km) |
| South Portland to Centralia (Illinois) | 1,039.71 mi (1,673.25 km) |
| South Portland to Centralia (Washington) | 2,526.42 mi (4,065.88 km) |
| South Portland to Centreville (Virginia) | 497.27 mi (800.27 km) |
| South Portland to Ceres (California) | 2,648.58 mi (4,262.48 km) |
| South Portland to Cerritos (California) | 2,623.12 mi (4,221.51 km) |
| South Portland to Chalco (Nebraska) | 1,323.95 mi (2,130.69 km) |
| South Portland to Chalmette (Louisiana) | 1,435.42 mi (2,310.08 km) |
| South Portland to Chambersburg (Pennsylvania) | 457.29 mi (735.94 km) |
| South Portland to Chamblee (Georgia) | 1,009.09 mi (1,623.97 km) |
| South Portland to Champaign (Illinois) | 954.52 mi (1,536.15 km) |
| South Portland to Champlin (Minnesota) | 1,141.39 mi (1,836.89 km) |
| South Portland to Chandler (Arizona) | 2,332.40 mi (3,753.64 km) |
| South Portland to Chanhassen (Minnesota) | 1,151.08 mi (1,852.49 km) |
| South Portland to Channahon (Illinois) | 925.81 mi (1,489.94 km) |
