| Ottawa to Ridgeland (Mississippi) | 621.42 mi (1,000.08 km) |
| Ottawa to Ridgewood (New Jersey) | 764.78 mi (1,230.80 km) |
| Ottawa to Rifle (Colorado) | 1,002.11 mi (1,612.74 km) |
| Ottawa to Rincon (Georgia) | 753.06 mi (1,211.93 km) |
| Ottawa to Ringwood (New Jersey) | 755.42 mi (1,215.73 km) |
| Ottawa to Río Grande (Puerto Rico) | 2,088.00 mi (3,360.32 km) |
| Ottawa to Rio Grande City (Texas) | 1,180.95 mi (1,900.56 km) |
| Ottawa to Rio Linda (California) | 1,725.33 mi (2,776.66 km) |
| Ottawa to Rio Rancho (New Mexico) | 1,053.03 mi (1,694.69 km) |
| Ottawa to Rio Rico (Arizona) | 1,401.98 mi (2,256.28 km) |
| Ottawa to Ripon (California) | 1,728.95 mi (2,782.47 km) |
| Ottawa to River Edge (New Jersey) | 769.08 mi (1,237.71 km) |
| Ottawa to River Falls (Wisconsin) | 308.75 mi (496.89 km) |
| Ottawa to River Forest (Illinois) | 63.97 mi (102.96 km) |
| Ottawa to River Grove (Illinois) | 64.41 mi (103.65 km) |
