| Hillsboro Kemah | Central Time | -02:00 |
| Hillsboro Keeranur | India Standard Time | -13:30 |
| Hillsboro Kebili | West Africa Time | -09:00 |
| Hillsboro Kelibia | Central European Time | -09:00 |
| Hillsboro Kelmarsh | United Kingdom Time | -08:00 |
| Hillsboro Kelantan | Western Indonesia Time | -15:00 |
| Hillsboro Kelawade | India Standard Time | -13:30 |
| Hillsboro Keilor East | Eastern Australia Time | -19:00 |
| Hillsboro Keith | United Kingdom Time | -08:00 |
| Hillsboro Kennebunkport | Eastern Time | -03:00 |
| Hillsboro Kenmore | Eastern Australia Time | -18:00 |
| Hillsboro Kenmare | Ireland Time | -08:00 |
| Hillsboro Kensington | Eastern Australia Time | -19:00 |
| Hillsboro Kennett | Central Time | -02:00 |
| Hillsboro Kenton | Eastern Time | -03:00 |
| Hillsboro Keralassery | India Standard Time | -13:30 |
| Hillsboro Kérou | West Africa Time | -09:00 |
| Hillsboro Kernen | Central European Time | -09:00 |
| Hillsboro Kerpen | Central European Time | -09:00 |
| Hillsboro Keswick | United Kingdom Time | -08:00 |
| Hillsboro Kesare | India Standard Time | -13:30 |
| Hillsboro Ketchikan | Alaska Time | 01:00 |
| Hillsboro Kettleman City | Pacific Time | 00:00 |
| Hillsboro Kewanee | Central Time | -02:00 |
| Hillsboro Key Biscayne | Eastern Time | -03:00 |
| Hillsboro Key Largo | Eastern Time | -03:00 |
| Hillsboro Kapolei | Hawaii-Aleutian Time | 02:00 |
| Hillsboro Kaprun | Central European Time | -09:00 |
| Hillsboro Kapuskasing | Eastern Time | -03:00 |
| Hillsboro Kannur | India Standard Time | -13:30 |
| Hillsboro Kansas City | Central Time | -02:00 |
| Hillsboro Kapar | Malaysia Time | -16:00 |
| Hillsboro Karumathampatti | India Standard Time | -13:30 |
| Hillsboro Kartal | Turkey Time | -11:00 |
| Hillsboro Karnak | Central Time | -02:00 |
| Hillsboro Karon | Indochina Time | -15:00 |
| Hillsboro Karlsborg | Central European Time | -09:00 |
| Hillsboro Karawara | Western Australia Time | -16:00 |
| Hillsboro Karambakkudi | India Standard Time | -13:30 |
| Hillsboro Kardinya | Western Australia Time | -16:00 |
| Hillsboro Karkkila | Eastern European Time | -10:00 |
| Hillsboro Kathu | Indochina Time | -15:00 |
| Hillsboro Kathikas | Eastern European Time | -10:00 |
| Hillsboro Katlenburg-Lindau | Central European Time | -09:00 |
| Hillsboro Katapady | India Standard Time | -13:30 |
| Hillsboro Kasuya | Japan Time | -17:00 |
| Hillsboro Kasia Bazaar | India Standard Time | -13:30 |
| Hillsboro Kasol | India Standard Time | -13:30 |
| Hillsboro Kashigarh | India Standard Time | -13:30 |
| Hillsboro Kasauli | India Standard Time | -13:30 |