| Willoughby to Keene (New Hampshire) | 473.88 mi (762.63 km) |
| Willoughby to Keizer (Oregon) | 2,081.45 mi (3,349.77 km) |
| Willoughby to Keller (Texas) | 1,054.78 mi (1,697.51 km) |
| Willoughby to Kelso (Washington) | 2,064.84 mi (3,323.05 km) |
| Willoughby to Kemp Mill (Maryland) | 292.78 mi (471.18 km) |
| Willoughby to Ken Caryl (Colorado) | 1,247.62 mi (2,007.86 km) |
| Willoughby to Kendale Lakes (Florida) | 1,102.67 mi (1,774.58 km) |
| Willoughby to Kendall (Florida) | 1,105.48 mi (1,779.10 km) |
| Willoughby to Kendall Park (New Jersey) | 366.70 mi (590.15 km) |
| Willoughby to Kendall West (Florida) | 1,102.69 mi (1,774.62 km) |
| Willoughby to Kenmore (New York) | 158.45 mi (255.00 km) |
| Willoughby to Kenmore (Washington) | 2,024.96 mi (3,258.86 km) |
| Willoughby to Kenner (Louisiana) | 943.14 mi (1,517.84 km) |
| Willoughby to Kennesaw (Georgia) | 554.73 mi (892.75 km) |
| Willoughby to Kennett (Missouri) | 595.33 mi (958.10 km) |
