| Ontario to Commerce (California) | 31.38 mi (50.50 km) |
| Ontario to Commerce City (Colorado) | 810.38 mi (1,304.19 km) |
| Ontario to Compton (California) | 36.99 mi (59.54 km) |
| Ontario to Comstock Park (Michigan) | 1,821.03 mi (2,930.66 km) |
| Ontario to Concord (California) | 366.22 mi (589.38 km) |
| Ontario to Concord (Missouri) | 1,542.99 mi (2,483.19 km) |
| Ontario to Concord (New Hampshire) | 2,531.24 mi (4,073.64 km) |
| Ontario to Concord (North Carolina) | 2,089.47 mi (3,362.67 km) |
| Ontario to Conneaut (Ohio) | 2,071.82 mi (3,334.28 km) |
| Ontario to Connersville (Indiana) | 1,826.01 mi (2,938.67 km) |
| Ontario to Conroe (Texas) | 1,316.25 mi (2,118.29 km) |
| Ontario to Converse (Texas) | 1,173.90 mi (1,889.20 km) |
| Ontario to Conway (Arkansas) | 1,428.38 mi (2,298.75 km) |
| Ontario to Conway (Florida) | 2,164.74 mi (3,483.82 km) |
| Ontario to Conway (South Carolina) | 2,197.15 mi (3,535.97 km) |
