| Ontario to Rockville (Maryland) | 2,253.04 mi (3,625.92 km) |
| Ontario to Rockville Centre (New York) | 2,432.04 mi (3,913.99 km) |
| Ontario to Rockwall (Texas) | 1,220.27 mi (1,963.84 km) |
| Ontario to Rocky Mount (North Carolina) | 2,240.96 mi (3,606.47 km) |
| Ontario to Rocky Point (New York) | 2,467.50 mi (3,971.06 km) |
| Ontario to Rocky River (Ohio) | 2,004.02 mi (3,225.16 km) |
| Ontario to Roessleville (New York) | 2,418.77 mi (3,892.64 km) |
| Ontario to Rogers (Arkansas) | 1,330.53 mi (2,141.28 km) |
| Ontario to Rogers (Minnesota) | 1,484.35 mi (2,388.83 km) |
| Ontario to Rohnert Park (California) | 411.17 mi (661.72 km) |
| Ontario to Rolla (Missouri) | 1,464.92 mi (2,357.56 km) |
| Ontario to Rolling Meadows (Illinois) | 1,692.32 mi (2,723.53 km) |
| Ontario to Roma (Texas) | 1,226.36 mi (1,973.64 km) |
| Ontario to Rome (Georgia) | 1,845.81 mi (2,970.55 km) |
| Ontario to Rome (New York) | 2,333.34 mi (3,755.15 km) |
