| Ontario to Clemson (South Carolina) | 1,975.04 mi (3,178.52 km) |
| Ontario to Clermont (Florida) | 2,141.64 mi (3,446.63 km) |
| Ontario to Cleveland (Mississippi) | 1,537.23 mi (2,473.92 km) |
| Ontario to Cleveland (Ohio) | 2,012.93 mi (3,239.51 km) |
| Ontario to Cleveland (Tennessee) | 1,854.81 mi (2,985.03 km) |
| Ontario to Cleveland Heights (Ohio) | 2,019.10 mi (3,249.43 km) |
| Ontario to Cliffside Park (New Jersey) | 2,413.13 mi (3,883.55 km) |
| Ontario to Clifton (Colorado) | 614.93 mi (989.64 km) |
| Ontario to Clifton (New Jersey) | 2,404.13 mi (3,869.07 km) |
| Ontario to Clinton (Iowa) | 1,577.44 mi (2,538.64 km) |
| Ontario to Clinton (Maryland) | 2,268.10 mi (3,650.16 km) |
| Ontario to Clinton (Mississippi) | 1,576.09 mi (2,536.48 km) |
| Ontario to Clinton (Utah) | 576.49 mi (927.77 km) |
| Ontario to Clive (Iowa) | 1,395.02 mi (2,245.07 km) |
| Ontario to Cloquet (Minnesota) | 1,574.98 mi (2,534.68 km) |
