| Boulder to Keizer (Oregon) | 965.77 mi (1,554.26 km) |
| Boulder to Keller (Texas) | 661.92 mi (1,065.26 km) |
| Boulder to Kelso (Washington) | 982.05 mi (1,580.46 km) |
| Boulder to Kemp Mill (Maryland) | 1,499.63 mi (2,413.42 km) |
| Boulder to Ken Caryl (Colorado) | 31.80 mi (51.17 km) |
| Boulder to Kendale Lakes (Florida) | 1,738.73 mi (2,798.21 km) |
| Boulder to Kendall (Florida) | 1,742.92 mi (2,804.96 km) |
| Boulder to Kendall Park (New Jersey) | 1,611.13 mi (2,592.87 km) |
| Boulder to Kendall West (Florida) | 1,737.34 mi (2,795.98 km) |
| Boulder to Kenmore (New York) | 1,374.51 mi (2,212.06 km) |
| Boulder to Kenmore (Washington) | 997.34 mi (1,605.06 km) |
| Boulder to Kenner (Louisiana) | 1,092.25 mi (1,757.80 km) |
| Boulder to Kennesaw (Georgia) | 1,207.93 mi (1,943.97 km) |
| Boulder to Kennett (Missouri) | 865.41 mi (1,392.74 km) |
| Boulder to Kennewick (Washington) | 819.81 mi (1,319.35 km) |
