| Prospect Heights to Johnstown (Pennsylvania) | 483.74 mi (778.50 km) |
| Prospect Heights to Joliet (Illinois) | 42.03 mi (67.64 km) |
| Prospect Heights to Jonesboro (Arkansas) | 458.51 mi (737.91 km) |
| Prospect Heights to Joplin (Missouri) | 492.92 mi (793.27 km) |
| Prospect Heights to Joppatowne (Maryland) | 632.97 mi (1,018.66 km) |
| Prospect Heights to Juana Díaz (Puerto Rico) | 2,085.23 mi (3,355.85 km) |
| Prospect Heights to Junction City (Kansas) | 514.02 mi (827.24 km) |
| Prospect Heights to Juneau (Alaska) | 2,271.65 mi (3,655.87 km) |
| Prospect Heights to Jupiter (Florida) | 1,138.25 mi (1,831.84 km) |
| Prospect Heights to Jupiter Farms (Florida) | 1,135.80 mi (1,827.89 km) |
| Prospect Heights to Jurupa Valley (California) | 1,692.01 mi (2,723.03 km) |
| Prospect Heights to Justice (Illinois) | 24.94 mi (40.14 km) |
| Prospect Heights to Kahului (Hawaii) | 4,179.48 mi (6,726.22 km) |
| Prospect Heights to Kailua (Hawaii) | 4,223.12 mi (6,796.46 km) |
| Prospect Heights to Kalamazoo (Michigan) | 120.29 mi (193.59 km) |
