| Prospect Heights to Hutchinson (Kansas) | 596.28 mi (959.61 km) |
| Prospect Heights to Hutchinson (Minnesota) | 375.94 mi (605.02 km) |
| Prospect Heights to Hutto (Texas) | 960.35 mi (1,545.53 km) |
| Prospect Heights to Hyattsville (Maryland) | 615.16 mi (990.01 km) |
| Prospect Heights to Hybla Valley (Virginia) | 615.14 mi (989.97 km) |
| Prospect Heights to Idaho Falls (Idaho) | 1,221.78 mi (1,966.26 km) |
| Prospect Heights to Idylwood (Virginia) | 604.96 mi (973.59 km) |
| Prospect Heights to Ilchester (Maryland) | 617.32 mi (993.48 km) |
| Prospect Heights to Immokalee (Florida) | 1,144.21 mi (1,841.43 km) |
| Prospect Heights to Imperial (California) | 1,636.27 mi (2,633.32 km) |
| Prospect Heights to Imperial Beach (California) | 1,722.94 mi (2,772.81 km) |
| Prospect Heights to Independence (Kentucky) | 280.87 mi (452.02 km) |
| Prospect Heights to Independence (Missouri) | 396.08 mi (637.43 km) |
| Prospect Heights to Indian Trail (North Carolina) | 624.66 mi (1,005.30 km) |
| Prospect Heights to Indiana (Pennsylvania) | 466.02 mi (749.98 km) |
