| Southborough to Kinston (North Carolina) | 3,877.33 mi (6,239.96 km) |
| Southborough to Kirkland (Washington) | 4,805.17 mi (7,733.17 km) |
| Southborough to Kirksville (Missouri) | 4,240.97 mi (6,825.18 km) |
| Southborough to Kirkwood (Missouri) | 4,237.12 mi (6,818.98 km) |
| Southborough to Kiryas Joel (New York) | 3,464.59 mi (5,575.72 km) |
| Southborough to Kissimmee (Florida) | 4,374.15 mi (7,039.52 km) |
| Southborough to Klamath Falls (Oregon) | 5,107.30 mi (8,219.41 km) |
| Southborough to Knightdale (North Carolina) | 3,890.80 mi (6,261.63 km) |
| Southborough to Knik-Fairview (Alaska) | 4,477.34 mi (7,205.58 km) |
| Southborough to Knoxville (Tennessee) | 4,105.95 mi (6,607.88 km) |
| Southborough to Kokomo (Indiana) | 3,981.30 mi (6,407.29 km) |
| Southborough to Kuna (Idaho) | 4,879.13 mi (7,852.19 km) |
| Southborough to Kyle (Texas) | 4,960.78 mi (7,983.61 km) |
| Southborough to La Cañada Flintridge (California) | 5,458.75 mi (8,785.01 km) |
| Southborough to La Crescenta-Montrose (California) | 5,458.59 mi (8,784.76 km) |
