| Thornton to Hutchinson (Minnesota) | 3,908.50 mi (6,290.12 km) |
| Thornton to Hutto (Texas) | 4,762.58 mi (7,664.63 km) |
| Thornton to Hyattsville (Maryland) | 3,543.55 mi (5,702.80 km) |
| Thornton to Hybla Valley (Virginia) | 3,558.60 mi (5,727.01 km) |
| Thornton to Idaho Falls (Idaho) | 4,557.40 mi (7,334.42 km) |
| Thornton to Idylwood (Virginia) | 3,556.79 mi (5,724.10 km) |
| Thornton to Ilchester (Maryland) | 3,524.12 mi (5,671.53 km) |
| Thornton to Immokalee (Florida) | 4,349.26 mi (6,999.46 km) |
| Thornton to Imperial (California) | 5,267.63 mi (8,477.44 km) |
| Thornton to Imperial Beach (California) | 5,332.82 mi (8,582.34 km) |
| Thornton to Independence (Kentucky) | 3,838.46 mi (6,177.40 km) |
| Thornton to Independence (Missouri) | 4,196.95 mi (6,754.34 km) |
| Thornton to Indian Trail (North Carolina) | 3,877.04 mi (6,239.50 km) |
| Thornton to Indiana (Pennsylvania) | 3,551.51 mi (5,715.61 km) |
| Thornton to Indianapolis (Indiana) | 3,858.88 mi (6,210.27 km) |
