| Flag | Code | Country | Time Difference (GMT) | Group | Comment | Internet Code |
 | 93 | AFGHANISTAN (Islamic State of) | 4.5 | | | af |
 | 1907 | ALASKA | -10 to -11 | USA | Some telcoms treat Alaska as an independant country - for billing purposes | us |
 | 355 | ALBANIA (Republic of) | 1 | | | al |
 | 44 | Alderney | 0 | UKD, CI | | gg |
 | 213 | ALGERIA (Peoples Democratic Republic of) | 1 | | | dz |
 | 684 | AMERICAN SAMOA | -11 | ASM | Also see 1684 | as |
 | 1684 | AMERICAN SAMOA | -11 | ASM | From 2 October 2004. Also see 684 | as |
 | 376 | ANDORRA (Principality of) | 1 | | | ad |
 | 244 | ANGOLA (Republic of) | 1 | | | ao |
 | 1264 | ANGUILLA | -4 | BRD, LEE | | ai |
 | 672 | ANTARCTICA AUSTRALIAN TERRITORY | +4.5 to +10 | AET | (6721) | aq |
 | 1268 | ANTIGUA AND BARBUDA | -4 | LEE, BCW | | ag |
 | 54 | ARGENTINA | -3 | | | ar |
 | 374 | ARMENIA (Republic of) | 4 | | | am |
 | 297 | ARUBA | -4 | | | aw |
 | 247 | ASCENSION ISLAND | 0 | BRD | | ac |
 | | Ashmore and Cartier Islands | | AET | | |
| 871 | ATLANTIC OCEAN (EAST) | | INMARSAT | | |
| 874 | ATLANTIC OCEAN (WEST) | | INMARSAT | | |
 | 61 | AUSTRALIA | +8 to +11 | BCW | Includes Cocos and Christmas Islands | au |
| 672 | AUSTRALIAN EXTERNAL TERRITORIES | +4.5 to +11.5 | AET | | |
 | 43 | AUSTRIA | 1 | EU | | at |
 | 994 | AZERBAIJANI REPUBLIC | 5 | | Formally part of USSR | az |
 | 351 | Azores | 0 | POR | | pt |