| South Portland to Cold Springs (Nevada) | 2,540.81 mi (4,089.04 km) |
| South Portland to Coldwater (Michigan) | 753.84 mi (1,213.18 km) |
| South Portland to Colesville (Maryland) | 469.13 mi (754.98 km) |
| South Portland to College (Alaska) | 3,198.06 mi (5,146.77 km) |
| South Portland to College Park (Georgia) | 1,027.94 mi (1,654.30 km) |
| South Portland to College Park (Maryland) | 470.30 mi (756.87 km) |
| South Portland to College Station (Texas) | 1,681.90 mi (2,706.76 km) |
| South Portland to Collegedale (Tennessee) | 984.08 mi (1,583.72 km) |
| South Portland to Colleyville (Texas) | 1,625.11 mi (2,615.36 km) |
| South Portland to Collierville (Tennessee) | 1,190.49 mi (1,915.91 km) |
| South Portland to Collinsville (Illinois) | 1,078.25 mi (1,735.27 km) |
| South Portland to Colonia (New Jersey) | 294.28 mi (473.59 km) |
| South Portland to Colonial Heights (Virginia) | 576.71 mi (928.12 km) |
| South Portland to Colonial Park (Pennsylvania) | 406.15 mi (653.64 km) |
| South Portland to Colorado Springs (Colorado) | 1,807.24 mi (2,908.47 km) |
