| South Portland to Channelview (Texas) | 1,664.26 mi (2,678.37 km) |
| South Portland to Chantilly (Virginia) | 495.23 mi (796.99 km) |
| South Portland to Chaparral (New Mexico) | 2,106.67 mi (3,390.36 km) |
| South Portland to Chapel Hill (North Carolina) | 705.70 mi (1,135.71 km) |
| South Portland to Charleston (Illinois) | 966.00 mi (1,554.63 km) |
| South Portland to Charleston (South Carolina) | 911.99 mi (1,467.70 km) |
| South Portland to Charleston (West Virginia) | 694.16 mi (1,117.15 km) |
| South Portland to Charlotte (North Carolina) | 808.16 mi (1,300.61 km) |
| South Portland to Charlottesville (Virginia) | 576.48 mi (927.76 km) |
| South Portland to Chaska (Minnesota) | 1,153.57 mi (1,856.49 km) |
| South Portland to Chatham (Illinois) | 1,035.70 mi (1,666.79 km) |
| South Portland to Chattanooga (Tennessee) | 991.94 mi (1,596.37 km) |
| South Portland to Cheat Lake (West Virginia) | 564.27 mi (908.10 km) |
| South Portland to Chelsea (Alabama) | 1,131.35 mi (1,820.72 km) |
| South Portland to Chelsea (Massachusetts) | 93.23 mi (150.03 km) |
