| South Portland to Crawfordsville (Indiana) | 888.43 mi (1,429.78 km) |
| South Portland to Crest Hill (Illinois) | 915.70 mi (1,473.67 km) |
| South Portland to Crestview (Florida) | 1,258.96 mi (2,026.10 km) |
| South Portland to Crestwood (Illinois) | 895.79 mi (1,441.64 km) |
| South Portland to Crestwood (Missouri) | 1,099.96 mi (1,770.21 km) |
| South Portland to Creve Coeur (Missouri) | 1,100.08 mi (1,770.41 km) |
| South Portland to Crofton (Maryland) | 459.84 mi (740.05 km) |
| South Portland to Crossville (Tennessee) | 943.19 mi (1,517.92 km) |
| South Portland to Crowley (Louisiana) | 1,523.82 mi (2,452.35 km) |
| South Portland to Crowley (Texas) | 1,647.55 mi (2,651.48 km) |
| South Portland to Crown Point (Indiana) | 880.31 mi (1,416.72 km) |
| South Portland to Crystal (Minnesota) | 1,140.40 mi (1,835.30 km) |
| South Portland to Crystal Lake (Illinois) | 916.14 mi (1,474.39 km) |
| South Portland to Cudahy (California) | 2,625.62 mi (4,225.52 km) |
| South Portland to Cudahy (Wisconsin) | 883.50 mi (1,421.85 km) |
