| South Portland to Chicago Ridge (Illinois) | 896.77 mi (1,443.22 km) |
| South Portland to Chickasha (Oklahoma) | 1,583.43 mi (2,548.28 km) |
| South Portland to Chico (California) | 2,629.01 mi (4,230.98 km) |
| South Portland to Chicopee (Massachusetts) | 153.10 mi (246.40 km) |
| South Portland to Chillicothe (Ohio) | 720.33 mi (1,159.26 km) |
| South Portland to Chillum (Maryland) | 473.46 mi (761.96 km) |
| South Portland to Chino (California) | 2,599.05 mi (4,182.77 km) |
| South Portland to Chino Hills (California) | 2,603.16 mi (4,189.38 km) |
| South Portland to Chino Valley (Arizona) | 2,310.59 mi (3,718.53 km) |
| South Portland to Chippewa Falls (Wisconsin) | 1,044.63 mi (1,681.17 km) |
| South Portland to Choctaw (Oklahoma) | 1,534.98 mi (2,470.32 km) |
| South Portland to Chowchilla (California) | 2,627.15 mi (4,227.99 km) |
| South Portland to Christiansburg (Virginia) | 695.10 mi (1,118.65 km) |
| South Portland to Chubbuck (Idaho) | 2,098.80 mi (3,377.69 km) |
| South Portland to Chula Vista (California) | 2,613.32 mi (4,205.74 km) |
