| Ottawa to Robertsville (New Jersey) | 761.87 mi (1,226.12 km) |
| Ottawa to Robinson (Texas) | 824.38 mi (1,326.72 km) |
| Ottawa to Robstown (Texas) | 1,062.10 mi (1,709.28 km) |
| Ottawa to Rochester (Michigan) | 306.93 mi (493.95 km) |
| Ottawa to Rochester (Minnesota) | 261.06 mi (420.13 km) |
| Ottawa to Rochester (New Hampshire) | 919.69 mi (1,480.11 km) |
| Ottawa to Rochester (New York) | 586.25 mi (943.48 km) |
| Ottawa to Rochester Hills (Michigan) | 304.73 mi (490.42 km) |
| Ottawa to Rock Hill (South Carolina) | 612.75 mi (986.13 km) |
| Ottawa to Rock Island (Illinois) | 91.36 mi (147.04 km) |
| Ottawa to Rock Springs (Wyoming) | 1,053.46 mi (1,695.38 km) |
| Ottawa to Rockford (Illinois) | 63.66 mi (102.45 km) |
| Ottawa to Rockledge (Florida) | 1,009.60 mi (1,624.80 km) |
| Ottawa to Rocklin (California) | 1,713.02 mi (2,756.84 km) |
| Ottawa to Rockport (Texas) | 1,031.86 mi (1,660.62 km) |
