| Ontario to Central Point (Oregon) | 643.68 mi (1,035.90 km) |
| Ontario to Centralia (Illinois) | 1,609.67 mi (2,590.51 km) |
| Ontario to Centralia (Washington) | 920.08 mi (1,480.72 km) |
| Ontario to Centreville (Virginia) | 2,239.03 mi (3,603.38 km) |
| Ontario to Ceres (California) | 309.32 mi (497.79 km) |
| Ontario to Cerritos (California) | 29.02 mi (46.70 km) |
| Ontario to Chalco (Nebraska) | 1,270.27 mi (2,044.31 km) |
| Ontario to Chalmette (Louisiana) | 1,639.10 mi (2,637.88 km) |
| Ontario to Chambersburg (Pennsylvania) | 2,223.22 mi (3,577.92 km) |
| Ontario to Chamblee (Georgia) | 1,900.10 mi (3,057.91 km) |
| Ontario to Champaign (Illinois) | 1,662.23 mi (2,675.10 km) |
| Ontario to Champlin (Minnesota) | 1,492.36 mi (2,401.72 km) |
| Ontario to Chandler (Arizona) | 335.02 mi (539.16 km) |
| Ontario to Chanhassen (Minnesota) | 1,476.31 mi (2,375.90 km) |
| Ontario to Channahon (Illinois) | 1,673.49 mi (2,693.23 km) |
