| South Portland to Cedar Park (Texas) | 1,755.43 mi (2,825.09 km) |
| South Portland to Cedar Rapids (Iowa) | 1,087.39 mi (1,749.98 km) |
| South Portland to Cedarburg (Wisconsin) | 886.19 mi (1,426.18 km) |
| South Portland to Celebration (Florida) | 1,229.04 mi (1,977.95 km) |
| South Portland to Celina (Ohio) | 760.93 mi (1,224.59 km) |
| South Portland to Celina (Texas) | 1,591.57 mi (2,561.38 km) |
| South Portland to Centennial (Colorado) | 1,794.63 mi (2,888.18 km) |
| South Portland to Center Point (Alabama) | 1,118.56 mi (1,800.15 km) |
| South Portland to Centereach (New York) | 238.38 mi (383.64 km) |
| South Portland to Centerton (Arkansas) | 1,360.50 mi (2,189.51 km) |
| South Portland to Centerville (Ohio) | 765.79 mi (1,232.42 km) |
| South Portland to Centerville (Utah) | 2,112.24 mi (3,399.33 km) |
| South Portland to Central (Louisiana) | 1,449.97 mi (2,333.50 km) |
| South Portland to Central Falls (Rhode Island) | 132.68 mi (213.52 km) |
| South Portland to Central Islip (New York) | 246.56 mi (396.80 km) |
