| Willoughby to Hutchinson (Kansas) | 907.78 mi (1,460.92 km) |
| Willoughby to Hutchinson (Minnesota) | 688.88 mi (1,108.64 km) |
| Willoughby to Hutto (Texas) | 1,179.81 mi (1,898.73 km) |
| Willoughby to Hyattsville (Maryland) | 299.05 mi (481.28 km) |
| Willoughby to Hybla Valley (Virginia) | 303.59 mi (488.58 km) |
| Willoughby to Idaho Falls (Idaho) | 1,554.91 mi (2,502.39 km) |
| Willoughby to Idylwood (Virginia) | 292.10 mi (470.09 km) |
| Willoughby to Ilchester (Maryland) | 296.03 mi (476.41 km) |
| Willoughby to Immokalee (Florida) | 1,051.64 mi (1,692.45 km) |
| Willoughby to Imperial (California) | 1,960.44 mi (3,155.02 km) |
| Willoughby to Imperial Beach (California) | 2,048.52 mi (3,296.77 km) |
| Willoughby to Independence (Kentucky) | 249.09 mi (400.87 km) |
| Willoughby to Independence (Missouri) | 703.10 mi (1,131.53 km) |
| Willoughby to Indian Trail (North Carolina) | 456.23 mi (734.23 km) |
| Willoughby to Indiana (Pennsylvania) | 136.94 mi (220.38 km) |
