| Thornton Heath to Hutchinson (Minnesota) | 4,059.96 mi (6,533.87 km) |
| Thornton Heath to Hutto (Texas) | 4,897.19 mi (7,881.26 km) |
| Thornton Heath to Hyattsville (Maryland) | 3,661.96 mi (5,893.36 km) |
| Thornton Heath to Hybla Valley (Virginia) | 3,676.73 mi (5,917.12 km) |
| Thornton Heath to Idaho Falls (Idaho) | 4,723.08 mi (7,601.07 km) |
| Thornton Heath to Idylwood (Virginia) | 3,675.43 mi (5,915.03 km) |
| Thornton Heath to Ilchester (Maryland) | 3,642.82 mi (5,862.55 km) |
| Thornton Heath to Immokalee (Florida) | 4,449.32 mi (7,160.50 km) |
| Thornton Heath to Imperial (California) | 5,427.57 mi (8,734.83 km) |
| Thornton Heath to Imperial Beach (California) | 5,494.11 mi (8,841.92 km) |
| Thornton Heath to Independence (Kentucky) | 3,968.11 mi (6,386.06 km) |
| Thornton Heath to Independence (Missouri) | 4,339.78 mi (6,984.20 km) |
| Thornton Heath to Indian Trail (North Carolina) | 3,993.03 mi (6,426.15 km) |
| Thornton Heath to Indiana (Pennsylvania) | 3,676.87 mi (5,917.35 km) |
| Thornton Heath to Indianapolis (Indiana) | 3,992.28 mi (6,424.96 km) |
