| Portland Hong | Central European Time | -09:00 |
| Portland Hong Kong | Hong Kong Time | -16:00 |
| Portland Hong Kong | Hong Kong Time | -16:00 |
| Portland Hong Kong | Hong Kong Time | -16:00 |
| Portland Hounslow | United Kingdom Time | -08:00 |
| Portland Hotchkiss | Mountain Time | -01:00 |
| Portland Hoylake | United Kingdom Time | -08:00 |
| Portland Howell | Eastern Time | -03:00 |
| Portland Howrah | India Standard Time | -13:30 |
| Portland Hoxie | Central Time | -02:00 |
| Portland Huanggang | China Time | -16:00 |
| Portland Huajuapan de León | Central Time | -02:00 |
| Portland Himmelkron | Central European Time | -09:00 |
| Portland Hima | East Africa Time | -11:00 |
| Portland Hillsborough | Eastern Time | -03:00 |
| Portland Hioki | Japan Time | -17:00 |
| Portland Hiram | Eastern Time | -03:00 |
| Portland Hingham | Eastern Time | -03:00 |
| Portland Hochdorf | Central European Time | -09:00 |
| Portland Hitzacker | Central European Time | -09:00 |
| Portland Homebush | Eastern Australia Time | -19:00 |
| Portland Hondarribia | Central European Time | -09:00 |
| Portland Homps | Central European Time | -09:00 |
| Portland Holywood | United Kingdom Time | -08:00 |
| Portland Holmes Beach | Eastern Time | -03:00 |
| Portland Holme's Hill | United Kingdom Time | -08:00 |
| Portland Hollywood | Eastern Time | -03:00 |
| Portland Holly Hill | Eastern Time | -03:00 |
| Portland Holly Hill | Eastern Time | -03:00 |
| Portland Hokes Bluff | Central Time | -02:00 |
| Portland Hokuto | Japan Time | -17:00 |
| Portland Holden Hill | Central Australia Time | -18:30 |
| Portland Holdenville | Central Time | -02:00 |
| Portland Holdorf | Central European Time | -09:00 |
| Portland Holdrege | Central Time | -02:00 |
| Portland Holesov | Central European Time | -09:00 |
| Portland Holgate | Eastern Australia Time | -19:00 |
| Portland Hogsback | South Africa Standard Time | -10:00 |
| Portland Hofheim | Central European Time | -09:00 |
| Portland Hoge Hexel | Central European Time | -09:00 |
| Portland Heubach | Central European Time | -09:00 |
| Portland Hethersett | United Kingdom Time | -08:00 |
| Portland Hewlett | Eastern Time | -03:00 |
| Portland Hexham | Eastern Australia Time | -19:00 |
| Portland Hexham | United Kingdom Time | -08:00 |
| Portland Heydon | United Kingdom Time | -08:00 |
| Portland Highgate | Western Australia Time | -16:00 |
| Portland High Falls | Eastern Time | -03:00 |
| Portland Higashiyama Ward | Japan Time | -17:00 |
| Portland Higashi Ward | Japan Time | -17:00 |