| Castle Rock to Hutchinson (Minnesota) | 657.23 mi (1,057.71 km) |
| Castle Rock to Hutto (Texas) | 737.01 mi (1,186.11 km) |
| Castle Rock to Hyattsville (Maryland) | 1,488.76 mi (2,395.92 km) |
| Castle Rock to Hybla Valley (Virginia) | 1,484.63 mi (2,389.28 km) |
| Castle Rock to Idaho Falls (Idaho) | 467.80 mi (752.85 km) |
| Castle Rock to Idylwood (Virginia) | 1,476.35 mi (2,375.95 km) |
| Castle Rock to Ilchester (Maryland) | 1,495.62 mi (2,406.96 km) |
| Castle Rock to Immokalee (Florida) | 1,619.39 mi (2,606.15 km) |
| Castle Rock to Imperial (California) | 748.75 mi (1,205.00 km) |
| Castle Rock to Imperial Beach (California) | 830.34 mi (1,336.30 km) |
| Castle Rock to Independence (Kentucky) | 1,085.83 mi (1,747.47 km) |
| Castle Rock to Independence (Missouri) | 562.17 mi (904.73 km) |
| Castle Rock to Indian Trail (North Carolina) | 1,360.31 mi (2,189.21 km) |
| Castle Rock to Indiana (Pennsylvania) | 1,358.08 mi (2,185.61 km) |
| Castle Rock to Indianapolis (Indiana) | 994.85 mi (1,601.06 km) |
