| Ottawa to Rancho Cordova (California) | 1,717.82 mi (2,764.57 km) |
| Ottawa to Rancho Cucamonga (California) | 1,639.15 mi (2,637.95 km) |
| Ottawa to Rancho Mirage (California) | 1,592.06 mi (2,562.17 km) |
| Ottawa to Rancho Palos Verdes (California) | 1,691.40 mi (2,722.04 km) |
| Ottawa to Rancho San Diego (California) | 1,649.86 mi (2,655.20 km) |
| Ottawa to Rancho Santa Margarita (California) | 1,656.10 mi (2,665.23 km) |
| Ottawa to Randallstown (Maryland) | 647.08 mi (1,041.37 km) |
| Ottawa to Rantoul (Illinois) | 80.74 mi (129.93 km) |
| Ottawa to Rapid City (South Dakota) | 753.37 mi (1,212.43 km) |
| Ottawa to Ravenna (Ohio) | 394.01 mi (634.10 km) |
| Ottawa to Raymondville (Texas) | 1,147.46 mi (1,846.67 km) |
| Ottawa to Raymore (Missouri) | 345.96 mi (556.77 km) |
| Ottawa to Raytown (Missouri) | 339.32 mi (546.08 km) |
| Ottawa to Reading (Ohio) | 274.32 mi (441.48 km) |
| Ottawa to Reading (Pennsylvania) | 677.20 mi (1,089.85 km) |
