| Ontario to Carlsbad (California) | 65.88 mi (106.02 km) |
| Ontario to Carlsbad (New Mexico) | 780.33 mi (1,255.82 km) |
| Ontario to Carmel (Indiana) | 1,773.70 mi (2,854.49 km) |
| Ontario to Carmichael (California) | 378.80 mi (609.62 km) |
| Ontario to Carney (Maryland) | 2,285.28 mi (3,677.80 km) |
| Ontario to Carnot-Moon (Pennsylvania) | 2,087.34 mi (3,359.25 km) |
| Ontario to Carol Stream (Illinois) | 1,685.24 mi (2,712.13 km) |
| Ontario to Carolina (Puerto Rico) | 3,339.32 mi (5,374.11 km) |
| Ontario to Carolina Forest (South Carolina) | 2,205.50 mi (3,549.41 km) |
| Ontario to Carpentersville (Illinois) | 1,679.51 mi (2,702.90 km) |
| Ontario to Carpinteria (California) | 111.62 mi (179.63 km) |
| Ontario to Carrboro (North Carolina) | 2,170.32 mi (3,492.79 km) |
| Ontario to Carroll (Iowa) | 1,350.52 mi (2,173.46 km) |
| Ontario to Carrollton (Georgia) | 1,859.40 mi (2,992.42 km) |
| Ontario to Carrollton (Texas) | 1,193.00 mi (1,919.95 km) |
