| Sydney Holdenville | Central Time | 15:00 |
| Sydney Holdorf | Central European Time | 08:00 |
| Sydney Holdrege | Central Time | 15:00 |
| Sydney Holesov | Central European Time | 08:00 |
| Sydney Holgate | Eastern Australia Time | 00:00 |
| Sydney Ischgl | Central European Time | 08:00 |
| Sydney Ishikawa | Japan Time | 01:00 |
| Sydney Issigeac | Central European Time | 08:00 |
| Sydney Islington | Eastern Australia Time | 00:00 |
| Sydney Islandia | Eastern Time | 14:00 |
| Sydney Isle | Central Time | 15:00 |
| Sydney Isla Mujeres | Eastern Time | 15:00 |
| Sydney Isla Canela | Central European Time | 08:00 |
| Sydney Islamorada | Eastern Time | 14:00 |
| Sydney Islamabad | Pakistan Time | 05:00 |
| Sydney Kafra | Eastern European Time | 07:00 |
| Sydney Kagawa-gun | Japan Time | 01:00 |
| Sydney Kaghan | Pakistan Time | 05:00 |
| Sydney Kahuku | Hawaii-Aleutian Time | 20:00 |
| Sydney Kadima Zoran | Israel Time | 07:00 |
| Sydney Kadapa | India Standard Time | 04:30 |
| Sydney Kadapra | India Standard Time | 04:30 |
| Sydney Kadambur | India Standard Time | 04:30 |
| Sydney Kerpen | Central European Time | 08:00 |
| Sydney Kérou | West Africa Time | 09:00 |
| Sydney Kernen | Central European Time | 08:00 |
| Sydney Keswick | United Kingdom Time | 09:00 |
| Sydney Kesare | India Standard Time | 04:30 |
| Sydney Ketchikan | Alaska Time | 18:00 |
| Sydney Kettleman City | Pacific Time | 17:00 |
| Sydney Kewanee | Central Time | 15:00 |
| Sydney Key Biscayne | Eastern Time | 14:00 |
| Sydney Key Largo | Eastern Time | 14:00 |
| Sydney Khadki | India Standard Time | 04:30 |
| Sydney Kfar Monash | Israel Time | 07:00 |
| Sydney Kfar Saba | Israel Time | 07:00 |
| Sydney Kfar Tavor | Israel Time | 07:00 |
| Sydney Keystone | Mountain Time | 16:00 |