| Ontario to Conyers (Georgia) | 1,919.94 mi (3,089.85 km) |
| Ontario to Cookeville (Tennessee) | 1,812.07 mi (2,916.24 km) |
| Ontario to Coolidge (Arizona) | 358.54 mi (577.02 km) |
| Ontario to Coon Rapids (Minnesota) | 1,496.14 mi (2,407.80 km) |
| Ontario to Cooper City (Florida) | 2,285.99 mi (3,678.94 km) |
| Ontario to Coos Bay (Oregon) | 737.01 mi (1,186.10 km) |
| Ontario to Copiague (New York) | 2,444.88 mi (3,934.66 km) |
| Ontario to Coppell (Texas) | 1,188.11 mi (1,912.08 km) |
| Ontario to Copperas Cove (Texas) | 1,162.24 mi (1,870.44 km) |
| Ontario to Coral Gables (Florida) | 2,296.18 mi (3,695.34 km) |
| Ontario to Coral Springs (Florida) | 2,281.52 mi (3,671.76 km) |
| Ontario to Coral Terrace (Florida) | 2,293.09 mi (3,690.38 km) |
| Ontario to Coralville (Iowa) | 1,507.00 mi (2,425.29 km) |
| Ontario to Coram (New York) | 2,464.12 mi (3,965.62 km) |
| Ontario to Corcoran (California) | 179.39 mi (288.70 km) |
