| Irthlingborough to Ridgeland (Mississippi) | 4,465.04 mi (7,185.79 km) |
| Irthlingborough to Ridgewood (New Jersey) | 3,416.59 mi (5,498.47 km) |
| Irthlingborough to Rifle (Colorado) | 4,740.28 mi (7,628.74 km) |
| Irthlingborough to Rincon (Georgia) | 4,113.25 mi (6,619.63 km) |
| Irthlingborough to Ringwood (New Jersey) | 3,417.64 mi (5,500.16 km) |
| Irthlingborough to Río Grande (Puerto Rico) | 4,179.27 mi (6,725.89 km) |
| Irthlingborough to Rio Grande City (Texas) | 5,121.64 mi (8,242.48 km) |
| Irthlingborough to Rio Linda (California) | 5,217.08 mi (8,396.08 km) |
| Irthlingborough to Rio Rancho (New Mexico) | 4,933.09 mi (7,939.05 km) |
| Irthlingborough to Rio Rico (Arizona) | 5,291.30 mi (8,515.53 km) |
| Irthlingborough to Ripon (California) | 5,262.85 mi (8,469.73 km) |
| Irthlingborough to River Edge (New Jersey) | 3,416.04 mi (5,497.59 km) |
| Irthlingborough to River Falls (Wisconsin) | 3,945.58 mi (6,349.80 km) |
| Irthlingborough to River Forest (Illinois) | 3,909.61 mi (6,291.91 km) |
| Irthlingborough to River Grove (Illinois) | 3,908.93 mi (6,290.81 km) |
