| Ontario to Clarksdale (Mississippi) | 1,542.04 mi (2,481.68 km) |
| Ontario to Clarkston (Georgia) | 1,904.37 mi (3,064.79 km) |
| Ontario to Clarksville (Indiana) | 1,791.06 mi (2,882.43 km) |
| Ontario to Clarksville (Tennessee) | 1,708.42 mi (2,749.44 km) |
| Ontario to Clawson (Michigan) | 1,943.42 mi (3,127.63 km) |
| Ontario to Clay (Alabama) | 1,771.62 mi (2,851.15 km) |
| Ontario to Clayton (California) | 361.95 mi (582.51 km) |
| Ontario to Clayton (Missouri) | 1,544.97 mi (2,486.39 km) |
| Ontario to Clayton (North Carolina) | 2,208.38 mi (3,554.04 km) |
| Ontario to Clayton (Ohio) | 1,869.58 mi (3,008.80 km) |
| Ontario to Clearfield (Utah) | 575.59 mi (926.33 km) |
| Ontario to Clearlake (California) | 439.70 mi (707.64 km) |
| Ontario to Clearwater (Florida) | 2,095.01 mi (3,371.59 km) |
| Ontario to Cleburne (Texas) | 1,171.24 mi (1,884.93 km) |
| Ontario to Clemmons (North Carolina) | 2,097.40 mi (3,375.44 km) |
