| Grayslake to Hilliard (Ohio) | 299.34 mi (481.74 km) |
| Grayslake to Hillsboro (Oregon) | 1,736.64 mi (2,794.85 km) |
| Grayslake to Hillsborough (California) | 1,835.05 mi (2,953.23 km) |
| Grayslake to Hillsborough (New Jersey) | 703.98 mi (1,132.95 km) |
| Grayslake to Hilo (Hawaii) | 4,153.57 mi (6,684.52 km) |
| Grayslake to Hilton Head Island (South Carolina) | 806.90 mi (1,298.59 km) |
| Grayslake to Hinesville (Georgia) | 807.54 mi (1,299.61 km) |
| Grayslake to Hinsdale (Illinois) | 37.69 mi (60.66 km) |
| Grayslake to Hobart (Indiana) | 69.22 mi (111.39 km) |
| Grayslake to Hobbs (New Mexico) | 1,059.24 mi (1,704.69 km) |
| Grayslake to Hobe Sound (Florida) | 1,144.85 mi (1,842.46 km) |
| Grayslake to Hoboken (New Jersey) | 731.76 mi (1,177.65 km) |
| Grayslake to Hockessin (Delaware) | 666.63 mi (1,072.83 km) |
| Grayslake to Hoffman Estates (Illinois) | 19.96 mi (32.12 km) |
| Grayslake to Holbrook (New York) | 779.84 mi (1,255.03 km) |
