| Castro Valley to Karditsa | 6,641.71 mi (10,688.80 km) |
| Castro Valley to Kastoria | 6,555.40 mi (10,549.90 km) |
| Castro Valley to Katerini | 6,601.01 mi (10,623.31 km) |
| Castro Valley to Keratsini | 6,769.75 mi (10,894.85 km) |
| Castro Valley to Kerkyra | 6,575.19 mi (10,581.75 km) |
| Castro Valley to Kiato | 6,745.57 mi (10,855.94 km) |
| Castro Valley to Kifisia | 6,767.44 mi (10,891.14 km) |
| Castro Valley to Kilkis | 6,565.83 mi (10,566.69 km) |
| Castro Valley to Komotini | 6,617.34 mi (10,649.57 km) |
| Castro Valley to Korinthos | 6,754.41 mi (10,870.18 km) |
| Castro Valley to Koropi | 6,780.14 mi (10,911.59 km) |
| Castro Valley to Korydallos | 6,769.54 mi (10,894.52 km) |
| Castro Valley to Kos | 6,924.83 mi (11,144.44 km) |
| Castro Valley to Kozani | 6,581.42 mi (10,591.77 km) |
| Castro Valley to Lagos | 6,610.65 mi (10,638.81 km) |
