| Ottawa to Rosemont (California) | 1,723.65 mi (2,773.94 km) |
| Ottawa to Rosemount (Minnesota) | 317.28 mi (510.62 km) |
| Ottawa to Rosenberg (Texas) | 905.23 mi (1,456.83 km) |
| Ottawa to Roseville (California) | 1,717.40 mi (2,763.89 km) |
| Ottawa to Roseville (Michigan) | 312.93 mi (503.61 km) |
| Ottawa to Roseville (Minnesota) | 333.81 mi (537.22 km) |
| Ottawa to Rossmoor (California) | 1,675.84 mi (2,697.01 km) |
| Ottawa to Rossville (Maryland) | 664.09 mi (1,068.75 km) |
| Ottawa to Roswell (Georgia) | 561.39 mi (903.46 km) |
| Ottawa to Roswell (New Mexico) | 1,021.18 mi (1,643.42 km) |
| Ottawa to Round Lake (Illinois) | 77.68 mi (125.01 km) |
| Ottawa to Round Lake Beach (Illinois) | 80.44 mi (129.46 km) |
| Ottawa to Round Rock (Texas) | 895.63 mi (1,441.38 km) |
| Ottawa to Rowland Heights (California) | 1,660.49 mi (2,672.30 km) |
| Ottawa to Rowlett (Texas) | 721.13 mi (1,160.54 km) |
