| Ontario to Candler-McAfee (Georgia) | 1,903.58 mi (3,063.52 km) |
| Ontario to Caño Martin Peña (Puerto Rico) | 3,334.37 mi (5,366.15 km) |
| Ontario to Cañon City (Colorado) | 753.48 mi (1,212.61 km) |
| Ontario to Canóvanas (Puerto Rico) | 3,345.01 mi (5,383.28 km) |
| Ontario to Canton (Georgia) | 1,885.32 mi (3,034.13 km) |
| Ontario to Canton (Illinois) | 1,573.28 mi (2,531.96 km) |
| Ontario to Canton (Mississippi) | 1,590.39 mi (2,559.48 km) |
| Ontario to Canton (Ohio) | 2,027.40 mi (3,262.78 km) |
| Ontario to Canyon (Texas) | 894.60 mi (1,439.72 km) |
| Ontario to Canyon Lake (California) | 31.27 mi (50.32 km) |
| Ontario to Canyon Lake (Texas) | 1,167.96 mi (1,879.65 km) |
| Ontario to Cape Coral (Florida) | 2,172.39 mi (3,496.13 km) |
| Ontario to Cape Girardeau (Missouri) | 1,584.41 mi (2,549.87 km) |
| Ontario to Carbondale (Illinois) | 1,602.88 mi (2,579.58 km) |
| Ontario to Carlisle (Pennsylvania) | 2,246.39 mi (3,615.21 km) |
