| Country | Capital |
| Haiti | name: Port-au-Prince geographic coordinates: 18 32 N, 72 20 W time difference: UTC-5 (same time as Washington, DC during Standard Time) daylight saving time: +1hr, begins first Sunday in April; ends last Sunday in October |
| Heard Island and McDonald Islands | void |
| Holy See (Vatican City) | name: Vatican City geographic coordinates: 41 54 N, 12 27 E time difference: UTC+1 (6 hours ahead of Washington, DC during Standard Time) daylight saving time: +1hr, begins last Sunday in March; ends last Sunday in October |
| Honduras | name: Tegucigalpa geographic coordinates: 14 06 N, 87 13 W time difference: UTC-6 (1 hour behind Washington, DC during Standard Time) daylight saving time: +1hr, begins second Sunday in March; ends first Sunday in November |
| Hong Kong | void |
| Hungary | name: Budapest geographic coordinates: 47 30 N, 19 05 E time difference: UTC+1 (6 hours ahead of Washington, DC during Standard Time) daylight saving time: +1hr, begins last Sunday in March; ends last Sunday in October |
| Iceland | name: Reykjavik geographic coordinates: 64 09 N, 21 57 W time difference: UTC (5 hours ahead of Washington, DC during Standard Time) |
| India | name: New Delhi geographic coordinates: 28 36 N, 77 12 E time difference: UTC+5.5 (10.5 hours ahead of Washington, DC during Standard Time) |
| Indian Ocean | void |
| Indonesia | name: Jakarta geographic coordinates: 6 10 S, 106 49 E time difference: UTC+7 (12 hours ahead of Washington, DC during Standard Time) note: Indonesia is divided into three time zones |
| Iran | name: Tehran geographic coordinates: 35 40 N, 51 25 E time difference: UTC+3.5 (8.5 hours ahead of Washington, DC during Standard Time) |
| Iraq | name: Baghdad geographic coordinates: 33 20 N, 44 23 E time difference: UTC+3 (8 hours ahead of Washington, DC during Standard Time) daylight saving time: +1hr, begins 1 April; ends 1 October |
| Ireland | name: Dublin geographic coordinates: 53 19 N, 6 14 W time difference: UTC 0 (5 hours ahead of Washington, DC during Standard Time) daylight saving time: +1hr, begins last Sunday in March; ends last Sunday in October |
| Isle of Man | name: Douglas geographic coordinates: 54 09 N, 4 29 W time difference: UTC 0 (five hours ahead of Washington, DC during Standard Time) daylight saving time: +1hr, begins last Sunday in March; ends last Sunday in October |
| Israel | name: Jerusalem geographic coordinates: 31 46 N, 35 14 E time difference: UTC+2 (7 hours ahead of Washington, DC during Standard Time) daylight saving time: +1hr, begins last Friday in March; ends the Sunday between the holidays of Rosh Hashana and Yom Kippur note: Israel proclaimed Jerusalem as its capital in 1950, but the US, like nearly all other countries, maintains its Embassy in Tel Aviv |
| Italy | name: Rome geographic coordinates: 41 54 N, 12 29 E time difference: UTC+1 (6 hours ahead of Washington, DC during Standard Time) daylight saving time: +1hr, begins last Sunday in March; ends last Sunday in October |
| Jamaica | name: Kingston geographic coordinates: 18 00 N, 76 48 W time difference: UTC-5 (same time as Washington, DC during Standard Time) |
| Jan Mayen | void |
| Japan | name: Tokyo geographic coordinates: 35 41 N, 139 45 E time difference: UTC+9 (14 hours ahead of Washington, DC during Standard Time) |
| Jersey | name: Saint Helier geographic coordinates: 49 11 N, 2 06 W time difference: UTC 0 (5 hours ahead of Washington, DC during Standard Time) daylight saving time: +1hr, begins last Sunday in March; ends last Sunday in October |
| Jordan | name: Amman geographic coordinates: 31 57 N, 35 56 E time difference: UTC+2 (7 hours ahead of Washington, DC during Standard Time) daylight saving time: +1hr, begins last Thursday in March; ends last Friday in September |
| Kazakhstan | name: Astana geographic coordinates: 51 10 N, 71 25 E time difference: UTC+6 (11 hours ahead of Washington, DC during Standard Time) note: Kazakhstan is divided into two time zones |
| Kenya | name: Nairobi geographic coordinates: 1 17 S, 36 49 E time difference: UTC+3 (8 hours ahead of Washington, DC during Standard Time) |
| Kiribati | name: Tarawa geographic coordinates: 1 19 N, 172 58 E time difference: UTC+12 (17 hours ahead of Washington, DC during Standard Time) |
| Korea, North | name: Pyongyang geographic coordinates: 39 01 N, 125 45 E time difference: UTC+9 (14 hours ahead of Washington, DC during Standard Time) |
| Korea, South | name: Seoul geographic coordinates: 37 33 N, 126 59 E time difference: UTC+9 (14 hours ahead of Washington, DC during Standard Time) |