| Ontario to Crawfordsville (Indiana) | 1,734.34 mi (2,791.16 km) |
| Ontario to Crest Hill (Illinois) | 1,682.55 mi (2,707.80 km) |
| Ontario to Crestview (Florida) | 1,817.47 mi (2,924.94 km) |
| Ontario to Crestwood (Illinois) | 1,702.33 mi (2,739.63 km) |
| Ontario to Crestwood (Missouri) | 1,542.03 mi (2,481.66 km) |
| Ontario to Creve Coeur (Missouri) | 1,538.98 mi (2,476.74 km) |
| Ontario to Crofton (Maryland) | 2,278.82 mi (3,667.41 km) |
| Ontario to Crossville (Tennessee) | 1,840.08 mi (2,961.32 km) |
| Ontario to Crowley (Louisiana) | 1,495.81 mi (2,407.27 km) |
| Ontario to Crowley (Texas) | 1,171.61 mi (1,885.52 km) |
| Ontario to Crown Point (Indiana) | 1,720.37 mi (2,768.66 km) |
| Ontario to Crystal (Minnesota) | 1,490.24 mi (2,398.31 km) |
| Ontario to Crystal Lake (Illinois) | 1,678.52 mi (2,701.31 km) |
| Ontario to Cudahy (California) | 33.44 mi (53.82 km) |
| Ontario to Cudahy (Wisconsin) | 1,711.09 mi (2,753.73 km) |
