| Olbia to Ridgeland (Mississippi) | 5,241.51 mi (8,435.39 km) |
| Olbia to Ridgewood (New Jersey) | 4,177.51 mi (6,723.06 km) |
| Olbia to Rifle (Colorado) | 5,622.83 mi (9,049.07 km) |
| Olbia to Rincon (Georgia) | 4,837.75 mi (7,785.60 km) |
| Olbia to Ringwood (New Jersey) | 4,180.47 mi (6,727.82 km) |
| Olbia to Río Grande (Puerto Rico) | 4,640.93 mi (7,468.86 km) |
| Olbia to Rio Grande City (Texas) | 5,908.43 mi (9,508.71 km) |
| Olbia to Rio Linda (California) | 6,127.82 mi (9,861.77 km) |
| Olbia to Rio Rancho (New Mexico) | 5,797.81 mi (9,330.67 km) |
| Olbia to Rio Rico (Arizona) | 6,157.99 mi (9,910.32 km) |
| Olbia to Ripon (California) | 6,171.76 mi (9,932.49 km) |
| Olbia to River Edge (New Jersey) | 4,176.11 mi (6,720.80 km) |
| Olbia to River Falls (Wisconsin) | 4,804.98 mi (7,732.87 km) |
| Olbia to River Forest (Illinois) | 4,736.30 mi (7,622.34 km) |
| Olbia to River Grove (Illinois) | 4,735.87 mi (7,621.64 km) |
