# ISO 3166-1

ISO 3166-1 (Codes for the representation of names of countries and their subdivisions – Part 1: Country code) is a standard defining codes for the names of countries, dependent territories, and special areas of geographical interest. It is the first part of the ISO 3166 standard published by the International Organization for Standardization.
It defines three sets of country codes:
* ISO 3166-1 alpha-2 – two-letter country codes which are used most prominently for the Internet's country code top-level domains (with a few exceptions).
* ISO 3166-1 alpha-3 – three-letter country codes which allow a better visual association between the codes and the country names than the alpha-2 codes.
* ISO 3166-1 numeric – three-digit country codes which are identical to those developed and maintained by the United Nations Statistics Division, with the advantage of script (writing system) independence, and hence useful for people or systems using non-Latin scripts.
The alphabetic country codes were first included in ISO 3166 in 1974, and the numeric country codes were first included in 1981. The country codes have been published as ISO 3166-1 since 1997, when ISO 3166 was expanded into three parts, with ISO 3166-2 defining codes for subdivisions and ISO 3166-3 defining codes for former countries.
As a widely used international standard, ISO 3166-1 is implemented in other standards and used by international organizations to allow facilitation of the exchange of goods and information. However, it is not the only standard for country codes. Other country codes used by many international organizations are partly or totally incompatible with ISO 3166-1, although some of them closely correspond to ISO 3166-1 codes.

## Criteria for inclusion

Codes for 249 countries, territories, or areas of geographical interest are assigned in ISO 3166-1. According to the ISO 3166 Maintenance Agency (ISO 3166/MA), the only way to enter a new country name into ISO 3166-1 is to have it registered in one of the following two sources:
* United Nations Terminology Bulletin Country Names, or
* Country and Region Codes for Statistical Use of the United Nations Statistics Division.
To be listed in the bulletin Country Names, a country must be at least one of the following:
* A member state of the United Nations
* A member of one of its specialized agencies
* A party to the Statute of the International Court of Justice
The list of names in Country and Region Codes for Statistical Use of the UN Statistics Division is based on the bulletin Country Names and other UN sources.
Once a country name or territory name appears in either of these two sources, it will be added to ISO 3166-1 by default.
The ISO 3166/MA may reserve code elements for other entities that do not qualify for inclusion based on the above criteria. For example, because the European Union is not a country, it is not formally included in ISO 3166-1, but for practical reasons, the ISO 3166/MA has "reserved the two-letter combination EU for the purpose of identifying the European Union within the framework of ISO 3166-1".

## Information included

ISO 3166-1 is published officially in both English and French. Since the second edition of ISO 3166-1, the following columns are included for each entry:
* Country Name – English (or French) short name (all upper-case)
* English (or French) short name lower case (title case)
* English (or French) full name
* Alpha-2 code
* Alpha-3 code
* Numeric code
* Remarks
* Independent
* Additional information: Administrative language(s) alpha-2 code element(s)
* Additional information: Administrative language(s) alpha-3 code element(s)
* Additional information: Local short name(s)

## Naming and code construction
### Naming and disputes

The country names used in ISO 3166-1 are taken from the two UN sources. Some country names used by the UN, and accordingly by ISO, are disputed:
| Short name upper case in ISO 3166 | Short name lower case in ISO 3166 Full name | Listed as independent in ISO 3166 | Local short name | Dispute | Link to ISO 3166-2 |
| AFGHANISTAN | Afghanistanthe Islamic Republic of Afghanistan | Yes | Afghānistān (ps) Afghānistān (fa) | Under the unrecognized government of the Islamic Emirate of Afghanistan | ISO 3166-2:AF |
| CHINA | China the People's Republic of China | Yes | Zhongguo (zh) | Disputed sovereignty with Taiwan | ISO 3166-2:CN |
| CYPRUS | Cyprus the Republic of Cyprus | Yes | Kýpros (el) Kıbrıs (tr) | Disputed sovereignty with Northern Cyprus | ISO 3166-2:CY |
| FALKLAND ISLANDS (MALVINAS) | Falkland Islands (the) [Malvinas] | No | Falkland Islands (the) [Malvinas] (en) | Disputed sovereignty and naming | ISO 3166-2:FK |
| PALESTINE, STATE OF | Palestine, State of the State of Palestine | No | Dawlat Filasţīn (ar) | Disputed sovereignty with Israel | ISO 3166-2:PS |
| TAIWAN, PROVINCE OF CHINA | Taiwan (Province of China) | No | Taiwan (zh) | Disputed sovereignty and naming | ISO 3166-2:TW |
| WESTERN SAHARA | Western Sahara | No | Aş Şaḩrā' al Gharbīyah (ar) | Disputed sovereignty with Morocco | ISO 3166-2:EH |

### Coding

The codes are chosen, according to the ISO 3166/MA, "to reflect the significant, unique component of the country name in order to allow a visual association between country name and country code". For this reason, common components of country names like "Republic", "Kingdom", "United", "Federal" or "Democratic" are normally not used for deriving the code elements. As a consequence, for example, the United Kingdom is officially assigned the alpha-2 code GB rather than UK, based on its official name "United Kingdom of Great Britain and Northern Ireland" (although UK is reserved on the request of the United Kingdom). Some codes are chosen based on the native names of the countries. For example, Germany is assigned the alpha-2 code DE, based on its native name "Deutschland".

## Codes

The complete ISO 3166-1 list of countries and their assigned codes, listed in alphabetical order by the country's English short name used by the ISO 3166/MA:
Each country's alpha-2 code is linked to more information about the assignment of its code elements.
ISO 3166-1 table :
| English short name (using title case) | Alpha-2 code | Alpha-3 code | Numeric code | Link to ISO 3166-2 | Independent |
| Afghanistan | AF | AFG | 004 | ISO 3166-2:AF | Yes |
| Åland Islands | AX | ALA | 248 | ISO 3166-2:AX | No |
| Albania | AL | ALB | 008 | ISO 3166-2:AL | Yes |
| Algeria | DZ | DZA | 012 | ISO 3166-2:DZ | Yes |
| American Samoa | AS | ASM | 016 | ISO 3166-2:AS | No |
| Andorra | AD | AND | 020 | ISO 3166-2:AD | Yes |
| Angola | AO | AGO | 024 | ISO 3166-2:AO | Yes |
| Anguilla | AI | AIA | 660 | ISO 3166-2:AI | No |
| Antarctica | AQ | ATA | 010 | ISO 3166-2:AQ | No |
| Antigua and Barbuda | AG | ATG | 028 | ISO 3166-2:AG | Yes |
| Argentina | AR | ARG | 032 | ISO 3166-2:AR | Yes |
| Armenia | AM | ARM | 051 | ISO 3166-2:AM | Yes |
| Aruba | AW | ABW | 533 | ISO 3166-2:AW | No |
| Australia | AU | AUS | 036 | ISO 3166-2:AU | Yes |
| Austria | AT | AUT | 040 | ISO 3166-2:AT | Yes |
| Azerbaijan | AZ | AZE | 031 | ISO 3166-2:AZ | Yes |
| Bahamas | BS | BHS | 044 | ISO 3166-2:BS | Yes |
| Bahrain | BH | BHR | 048 | ISO 3166-2:BH | Yes |
| Bangladesh | BD | BGD | 050 | ISO 3166-2:BD | Yes |
| Barbados | BB | BRB | 052 | ISO 3166-2:BB | Yes |
| Belarus | BY | BLR | 112 | ISO 3166-2:BY | Yes |
| Belgium | BE | BEL | 056 | ISO 3166-2:BE | Yes |
| Belize | BZ | BLZ | 084 | ISO 3166-2:BZ | Yes |
| Benin | BJ | BEN | 204 | ISO 3166-2:BJ | Yes |
| Bermuda | BM | BMU | 060 | ISO 3166-2:BM | No |
| Bhutan | BT | BTN | 064 | ISO 3166-2:BT | Yes |
| Bolivia, Plurinational State of | BO | BOL | 068 | ISO 3166-2:BO | Yes |
| Bonaire, Sint Eustatius and Saba | BQ | BES | 535 | ISO 3166-2:BQ | No |
| Bosnia and Herzegovina | BA | BIH | 070 | ISO 3166-2:BA | Yes |
| Botswana | BW | BWA | 072 | ISO 3166-2:BW | Yes |
| Bouvet Island | BV | BVT | 074 | ISO 3166-2:BV | No |
| Brazil | BR | BRA | 076 | ISO 3166-2:BR | Yes |
| British Indian Ocean Territory | IO | IOT | 086 | ISO 3166-2:IO | No |
| Brunei Darussalam | BN | BRN | 096 | ISO 3166-2:BN | Yes |
| Bulgaria | BG | BGR | 100 | ISO 3166-2:BG | Yes |
| Burkina Faso | BF | BFA | 854 | ISO 3166-2:BF | Yes |
| Burundi | BI | BDI | 108 | ISO 3166-2:BI | Yes |
| Cabo Verde | CV | CPV | 132 | ISO 3166-2:CV | Yes |
| Cambodia | KH | KHM | 116 | ISO 3166-2:KH | Yes |
| Cameroon | CM | CMR | 120 | ISO 3166-2:CM | Yes |
| Canada | CA | CAN | 124 | ISO 3166-2:CA | Yes |
| Cayman Islands | KY | CYM | 136 | ISO 3166-2:KY | No |
| Central African Republic | CF | CAF | 140 | ISO 3166-2:CF | Yes |
| Chad | TD | TCD | 148 | ISO 3166-2:TD | Yes |
| Chile | CL | CHL | 152 | ISO 3166-2:CL | Yes |
| China | CN | CHN | 156 | ISO 3166-2:CN | Yes |
| Christmas Island | CX | CXR | 162 | ISO 3166-2:CX | No |
| Cocos (Keeling) Islands | CC | CCK | 166 | ISO 3166-2:CC | No |
| Colombia | CO | COL | 170 | ISO 3166-2:CO | Yes |
| Comoros | KM | COM | 174 | ISO 3166-2:KM | Yes |
| Congo | CG | COG | 178 | ISO 3166-2:CG | Yes |
| Congo, Democratic Republic of the | CD | COD | 180 | ISO 3166-2:CD | Yes |
| Cook Islands | CK | COK | 184 | ISO 3166-2:CK | No |
| Costa Rica | CR | CRI | 188 | ISO 3166-2:CR | Yes |
| Côte d'Ivoire | CI | CIV | 384 | ISO 3166-2:CI | Yes |
| Croatia | HR | HRV | 191 | ISO 3166-2:HR | Yes |
| Cuba | CU | CUB | 192 | ISO 3166-2:CU | Yes |
| Curaçao | CW | CUW | 531 | ISO 3166-2:CW | No |
| Cyprus | CY | CYP | 196 | ISO 3166-2:CY | Yes |
| Czechia | CZ | CZE | 203 | ISO 3166-2:CZ | Yes |
| Denmark | DK | DNK | 208 | ISO 3166-2:DK | Yes |
| Djibouti | DJ | DJI | 262 | ISO 3166-2:DJ | Yes |
| Dominica | DM | DMA | 212 | ISO 3166-2:DM | Yes |
| Dominican Republic | DO | DOM | 214 | ISO 3166-2:DO | Yes |
| Ecuador | EC | ECU | 218 | ISO 3166-2:EC | Yes |
| Egypt | EG | EGY | 818 | ISO 3166-2:EG | Yes |
| El Salvador | SV | SLV | 222 | ISO 3166-2:SV | Yes |
| Equatorial Guinea | GQ | GNQ | 226 | ISO 3166-2:GQ | Yes |
| Eritrea | ER | ERI | 232 | ISO 3166-2:ER | Yes |
| Estonia | EE | EST | 233 | ISO 3166-2:EE | Yes |
| Eswatini | SZ | SWZ | 748 | ISO 3166-2:SZ | Yes |
| Ethiopia | ET | ETH | 231 | ISO 3166-2:ET | Yes |
| Falkland Islands (Malvinas) | FK | FLK | 238 | ISO 3166-2:FK | No |
| Faroe Islands | FO | FRO | 234 | ISO 3166-2:FO | No |
| Fiji | FJ | FJI | 242 | ISO 3166-2:FJ | Yes |
| Finland | FI | FIN | 246 | ISO 3166-2:FI | Yes |
| France | FR | FRA | 250 | ISO 3166-2:FR | Yes |
| French Guiana | GF | GUF | 254 | ISO 3166-2:GF | No |
| French Polynesia | PF | PYF | 258 | ISO 3166-2:PF | No |
| French Southern Territories | TF | ATF | 260 | ISO 3166-2:TF | No |
| Gabon | GA | GAB | 266 | ISO 3166-2:GA | Yes |
| Gambia | GM | GMB | 270 | ISO 3166-2:GM | Yes |
| Georgia | GE | GEO | 268 | ISO 3166-2:GE | Yes |
| Germany | DE | DEU | 276 | ISO 3166-2:DE | Yes |
| Ghana | GH | GHA | 288 | ISO 3166-2:GH | Yes |
| Gibraltar | GI | GIB | 292 | ISO 3166-2:GI | No |
| Greece | GR | GRC | 300 | ISO 3166-2:GR | Yes |
| Greenland | GL | GRL | 304 | ISO 3166-2:GL | No |
| Grenada | GD | GRD | 308 | ISO 3166-2:GD | Yes |
| Guadeloupe | GP | GLP | 312 | ISO 3166-2:GP | No |
| Guam | GU | GUM | 316 | ISO 3166-2:GU | No |
| Guatemala | GT | GTM | 320 | ISO 3166-2:GT | Yes |
| Guernsey | GG | GGY | 831 | ISO 3166-2:GG | No |
| Guinea | GN | GIN | 324 | ISO 3166-2:GN | Yes |
| Guinea-Bissau | GW | GNB | 624 | ISO 3166-2:GW | Yes |
| Guyana | GY | GUY | 328 | ISO 3166-2:GY | Yes |
| Haiti | HT | HTI | 332 | ISO 3166-2:HT | Yes |
| Heard Island and McDonald Islands | HM | HMD | 334 | ISO 3166-2:HM | No |
| Holy See | VA | VAT | 336 | ISO 3166-2:VA | Yes |
| Honduras | HN | HND | 340 | ISO 3166-2:HN | Yes |
| Hong Kong | HK | HKG | 344 | ISO 3166-2:HK | No |
| Hungary | HU | HUN | 348 | ISO 3166-2:HU | Yes |
| Iceland | IS | ISL | 352 | ISO 3166-2:IS | Yes |
| India | IN | IND | 356 | ISO 3166-2:IN | Yes |
| Indonesia | ID | IDN | 360 | ISO 3166-2:ID | Yes |
| Iran, Islamic Republic of | IR | IRN | 364 | ISO 3166-2:IR | Yes |
| Iraq | IQ | IRQ | 368 | ISO 3166-2:IQ | Yes |
| Ireland | IE | IRL | 372 | ISO 3166-2:IE | Yes |
| Isle of Man | IM | IMN | 833 | ISO 3166-2:IM | No |
| Israel | IL | ISR | 376 | ISO 3166-2:IL | Yes |
| Italy | IT | ITA | 380 | ISO 3166-2:IT | Yes |
| Jamaica | JM | JAM | 388 | ISO 3166-2:JM | Yes |
| Japan | JP | JPN | 392 | ISO 3166-2:JP | Yes |
| Jersey | JE | JEY | 832 | ISO 3166-2:JE | No |
| Jordan | JO | JOR | 400 | ISO 3166-2:JO | Yes |
| Kazakhstan | KZ | KAZ | 398 | ISO 3166-2:KZ | Yes |
| Kenya | KE | KEN | 404 | ISO 3166-2:KE | Yes |
| Kiribati | KI | KIR | 296 | ISO 3166-2:KI | Yes |
| Korea, Democratic People's Republic of | KP | PRK | 408 | ISO 3166-2:KP | Yes |
| Korea, Republic of | KR | KOR | 410 | ISO 3166-2:KR | Yes |
| Kuwait | KW | KWT | 414 | ISO 3166-2:KW | Yes |
| Kyrgyzstan | KG | KGZ | 417 | ISO 3166-2:KG | Yes |
| Lao People's Democratic Republic | LA | LAO | 418 | ISO 3166-2:LA | Yes |
| Latvia | LV | LVA | 428 | ISO 3166-2:LV | Yes |
| Lebanon | LB | LBN | 422 | ISO 3166-2:LB | Yes |
| Lesotho | LS | LSO | 426 | ISO 3166-2:LS | Yes |
| Liberia | LR | LBR | 430 | ISO 3166-2:LR | Yes |
| Libya | LY | LBY | 434 | ISO 3166-2:LY | Yes |
| Liechtenstein | LI | LIE | 438 | ISO 3166-2:LI | Yes |
| Lithuania | LT | LTU | 440 | ISO 3166-2:LT | Yes |
| Luxembourg | LU | LUX | 442 | ISO 3166-2:LU | Yes |
| Macao | MO | MAC | 446 | ISO 3166-2:MO | No |
| Madagascar | MG | MDG | 450 | ISO 3166-2:MG | Yes |
| Malawi | MW | MWI | 454 | ISO 3166-2:MW | Yes |
| Malaysia | MY | MYS | 458 | ISO 3166-2:MY | Yes |
| Maldives | MV | MDV | 462 | ISO 3166-2:MV | Yes |
| Mali | ML | MLI | 466 | ISO 3166-2:ML | Yes |
| Malta | MT | MLT | 470 | ISO 3166-2:MT | Yes |
| Marshall Islands | MH | MHL | 584 | ISO 3166-2:MH | Yes |
| Martinique | MQ | MTQ | 474 | ISO 3166-2:MQ | No |
| Mauritania | MR | MRT | 478 | ISO 3166-2:MR | Yes |
| Mauritius | MU | MUS | 480 | ISO 3166-2:MU | Yes |
| Mayotte | YT | MYT | 175 | ISO 3166-2:YT | No |
| Mexico | MX | MEX | 484 | ISO 3166-2:MX | Yes |
| Micronesia, Federated States of | FM | FSM | 583 | ISO 3166-2:FM | Yes |
| Moldova, Republic of | MD | MDA | 498 | ISO 3166-2:MD | Yes |
| Monaco | MC | MCO | 492 | ISO 3166-2:MC | Yes |
| Mongolia | MN | MNG | 496 | ISO 3166-2:MN | Yes |
| Montenegro | ME | MNE | 499 | ISO 3166-2:ME | Yes |
| Montserrat | MS | MSR | 500 | ISO 3166-2:MS | No |
| Morocco | MA | MAR | 504 | ISO 3166-2:MA | Yes |
| Mozambique | MZ | MOZ | 508 | ISO 3166-2:MZ | Yes |
| Myanmar | MM | MMR | 104 | ISO 3166-2:MM | Yes |
| Namibia | NA | NAM | 516 | ISO 3166-2:NA | Yes |
| Nauru | NR | NRU | 520 | ISO 3166-2:NR | Yes |
| Nepal | NP | NPL | 524 | ISO 3166-2:NP | Yes |
| Netherlands, Kingdom of the | NL | NLD | 528 | ISO 3166-2:NL | Yes |
| New Caledonia | NC | NCL | 540 | ISO 3166-2:NC | No |
| New Zealand | NZ | NZL | 554 | ISO 3166-2:NZ | Yes |
| Nicaragua | NI | NIC | 558 | ISO 3166-2:NI | Yes |
| Niger | NE | NER | 562 | ISO 3166-2:NE | Yes |
| Nigeria | NG | NGA | 566 | ISO 3166-2:NG | Yes |
| Niue | NU | NIU | 570 | ISO 3166-2:NU | No |
| Norfolk Island | NF | NFK | 574 | ISO 3166-2:NF | No |
| North Macedonia | MK | MKD | 807 | ISO 3166-2:MK | Yes |
| Northern Mariana Islands | MP | MNP | 580 | ISO 3166-2:MP | No |
| Norway | NO | NOR | 578 | ISO 3166-2:NO | Yes |
| Oman | OM | OMN | 512 | ISO 3166-2:OM | Yes |
| Pakistan | PK | PAK | 586 | ISO 3166-2:PK | Yes |
| Palau | PW | PLW | 585 | ISO 3166-2:PW | Yes |
| Palestine, State of | PS | PSE | 275 | ISO 3166-2:PS | No |
| Panama | PA | PAN | 591 | ISO 3166-2:PA | Yes |
| Papua New Guinea | PG | PNG | 598 | ISO 3166-2:PG | Yes |
| Paraguay | PY | PRY | 600 | ISO 3166-2:PY | Yes |
| Peru | PE | PER | 604 | ISO 3166-2:PE | Yes |
| Philippines | PH | PHL | 608 | ISO 3166-2:PH | Yes |
| Pitcairn | PN | PCN | 612 | ISO 3166-2:PN | No |
| Poland | PL | POL | 616 | ISO 3166-2:PL | Yes |
| Portugal | PT | PRT | 620 | ISO 3166-2:PT | Yes |
| Puerto Rico | PR | PRI | 630 | ISO 3166-2:PR | No |
| Qatar | QA | QAT | 634 | ISO 3166-2:QA | Yes |
| Réunion | RE | REU | 638 | ISO 3166-2:RE | No |
| Romania | RO | ROU | 642 | ISO 3166-2:RO | Yes |
| Russian Federation | RU | RUS | 643 | ISO 3166-2:RU | Yes |
| Rwanda | RW | RWA | 646 | ISO 3166-2:RW | Yes |
| Saint Barthélemy | BL | BLM | 652 | ISO 3166-2:BL | No |
| Saint Helena, Ascension and Tristan da Cunha | SH | SHN | 654 | ISO 3166-2:SH | No |
| Saint Kitts and Nevis | KN | KNA | 659 | ISO 3166-2:KN | Yes |
| Saint Lucia | LC | LCA | 662 | ISO 3166-2:LC | Yes |
| Saint Martin (French part) | MF | MAF | 663 | ISO 3166-2:MF | No |
| Saint Pierre and Miquelon | PM | SPM | 666 | ISO 3166-2:PM | No |
| Saint Vincent and the Grenadines | VC | VCT | 670 | ISO 3166-2:VC | Yes |
| Samoa | WS | WSM | 882 | ISO 3166-2:WS | Yes |
| San Marino | SM | SMR | 674 | ISO 3166-2:SM | Yes |
| Sao Tome and Principe | ST | STP | 678 | ISO 3166-2:ST | Yes |
| Saudi Arabia | SA | SAU | 682 | ISO 3166-2:SA | Yes |
| Senegal | SN | SEN | 686 | ISO 3166-2:SN | Yes |
| Serbia | RS | SRB | 688 | ISO 3166-2:RS | Yes |
| Seychelles | SC | SYC | 690 | ISO 3166-2:SC | Yes |
| Sierra Leone | SL | SLE | 694 | ISO 3166-2:SL | Yes |
| Singapore | SG | SGP | 702 | ISO 3166-2:SG | Yes |
| Sint Maarten (Dutch part) | SX | SXM | 534 | ISO 3166-2:SX | No |
| Slovakia | SK | SVK | 703 | ISO 3166-2:SK | Yes |
| Slovenia | SI | SVN | 705 | ISO 3166-2:SI | Yes |
| Solomon Islands | SB | SLB | 090 | ISO 3166-2:SB | Yes |
| Somalia | SO | SOM | 706 | ISO 3166-2:SO | Yes |
| South Africa | ZA | ZAF | 710 | ISO 3166-2:ZA | Yes |
| South Georgia and the South Sandwich Islands | GS | SGS | 239 | ISO 3166-2:GS | No |
| South Sudan | SS | SSD | 728 | ISO 3166-2:SS | Yes |
| Spain | ES | ESP | 724 | ISO 3166-2:ES | Yes |
| Sri Lanka | LK | LKA | 144 | ISO 3166-2:LK | Yes |
| Sudan | SD | SDN | 729 | ISO 3166-2:SD | Yes |
| Suriname | SR | SUR | 740 | ISO 3166-2:SR | Yes |
| Svalbard and Jan Mayen | SJ | SJM | 744 | ISO 3166-2:SJ | No |
| Sweden | SE | SWE | 752 | ISO 3166-2:SE | Yes |
| Switzerland | CH | CHE | 756 | ISO 3166-2:CH | Yes |
| Syrian Arab Republic | SY | SYR | 760 | ISO 3166-2:SY | Yes |
| Taiwan, Province of China | TW | TWN | 158 | ISO 3166-2:TW | No |
| Tajikistan | TJ | TJK | 762 | ISO 3166-2:TJ | Yes |
| Tanzania, United Republic of | TZ | TZA | 834 | ISO 3166-2:TZ | Yes |
| Thailand | TH | THA | 764 | ISO 3166-2:TH | Yes |
| Timor-Leste | TL | TLS | 626 | ISO 3166-2:TL | Yes |
| Togo | TG | TGO | 768 | ISO 3166-2:TG | Yes |
| Tokelau | TK | TKL | 772 | ISO 3166-2:TK | No |
| Tonga | TO | TON | 776 | ISO 3166-2:TO | Yes |
| Trinidad and Tobago | TT | TTO | 780 | ISO 3166-2:TT | Yes |
| Tunisia | TN | TUN | 788 | ISO 3166-2:TN | Yes |
| Türkiye | TR | TUR | 792 | ISO 3166-2:TR | Yes |
| Turkmenistan | TM | TKM | 795 | ISO 3166-2:TM | Yes |
| Turks and Caicos Islands | TC | TCA | 796 | ISO 3166-2:TC | No |
| Tuvalu | TV | TUV | 798 | ISO 3166-2:TV | Yes |
| Uganda | UG | UGA | 800 | ISO 3166-2:UG | Yes |
| Ukraine | UA | UKR | 804 | ISO 3166-2:UA | Yes |
| United Arab Emirates | AE | ARE | 784 | ISO 3166-2:AE | Yes |
| United Kingdom of Great Britain and Northern Ireland | GB | GBR | 826 | ISO 3166-2:GB | Yes |
| United States of America | US | USA | 840 | ISO 3166-2:US | Yes |
| United States Minor Outlying Islands | UM | UMI | 581 | ISO 3166-2:UM | No |
| Uruguay | UY | URY | 858 | ISO 3166-2:UY | Yes |
| Uzbekistan | UZ | UZB | 860 | ISO 3166-2:UZ | Yes |
| Vanuatu | VU | VUT | 548 | ISO 3166-2:VU | Yes |
| Venezuela, Bolivarian Republic of | VE | VEN | 862 | ISO 3166-2:VE | Yes |
| Viet Nam | VN | VNM | 704 | ISO 3166-2:VN | Yes |
| Virgin Islands (British) | VG | VGB | 092 | ISO 3166-2:VG | No |
| Virgin Islands (U.S.) | VI | VIR | 850 | ISO 3166-2:VI | No |
| Wallis and Futuna | WF | WLF | 876 | ISO 3166-2:WF | No |
| Western Sahara | EH | ESH | 732 | ISO 3166-2:EH | No |
| Yemen | YE | YEM | 887 | ISO 3166-2:YE | Yes |
| Zambia | ZM | ZMB | 894 | ISO 3166-2:ZM | Yes |
| Zimbabwe | ZW | ZWE | 716 | ISO 3166-2:ZW | Yes |

### Reserved and user-assigned code elements

The officially assigned code elements may be expanded by using either reserved codes or user-assigned codes.
Reserved code elements are codes which have become obsolete, are used in other coding systems such as WIPO ST.3, or are required in order to enable a particular user application of the standard but do not qualify for inclusion in ISO 3166-1. To avoid transitional application problems and to aid users who require specific additional code elements for the functioning of their coding systems, the ISO 3166/MA, when justified, reserves these codes for a certain use for a limited or indeterminate period of time. Codes are usually reserved for former countries, overseas territories, international organizations, and special nationality status. The reserved alpha-2 and alpha-3 codes can be divided into three categories: (follow the links for the reserved codes of each category)
* Alpha-2: exceptional reservations, transitional reservations, and indeterminate reservations
* Alpha-3: exceptional reservations, transitional reservations, and indeterminate reservations
* Numeric: no reserved codes
User-assigned code elements are codes at the disposal of users who need to add further names of countries, territories, or other geographical entities to their in-house application of ISO 3166-1, and the ISO 3166/MA will never use these codes when updating the standard. These codes can be user-assigned:
* Alpha-2: AA, QM to QZ, XA to XZ, and ZZ
* Alpha-3: AAA to AAZ, QMA to QZZ, XAA to XZZ, and ZZA to ZZZ
* Numeric: 900 to 999

#### User-assigned codes in wide use

* XI: Used to denote Northern Ireland for the purposes of VAT collection in trade between it and the European Union.

## Changes

The ISO 3166/MA updates ISO 3166-1 when necessary. A country is normally assigned new ISO 3166-1 codes if it changes its name or its territorial boundaries. In general, new alphabetic codes are assigned if a country changes a significant part of its name, while a new numeric code is assigned if a country changes its territorial boundaries. Codes for country names that have been deleted from ISO 3166-1 are published in ISO 3166-3.
ISO formerly announced changes in newsletters which updated the standard, and periodically released new editions which consolidated the newsletter changes. As of July 2013, changes are published in the online catalogue of ISO only, and newsletters are no longer published. Past newsletters remain available via the search option on the ISO website.
| Edition/Newsletter | Date issued | Contents |
| ISO 3166:1974 | 1974 | First edition of ISO 3166 |
| ISO 3166:1981 | 1981 | Second edition of ISO 3166 |
| ISO 3166:1988 | 1988-08-15 | Third edition of ISO 3166 |
| ISO 3166:1994 | 1994-02-10 | Fourth edition of ISO 3166 |
| ISO 3166-1:1997 | 1997-09-25 | First edition of ISO 3166-1 (ISO 3166 expanded into three parts) |
| Newsletter V-1 Archived 2018-12-07 at the Wayback Machine | 1998-02-05 | Change of official name (Samoa) |
| Newsletter V-2 Archived 2011-07-22 at the Wayback Machine | 1999-10-01 | Inclusion of new country name and code elements (Palestinian Territory, Occupied) |
| Newsletter V-3 | 2002-02-01 | Change of alpha-3 Code Element (Romania) |
| Newsletter V-4 Archived 2018-12-07 at the Wayback Machine | 2002-05-20 | Name changes (Afghanistan, Azerbaijan, Bahrain, Bosnia and Herzegovina, Fiji, Hong Kong, Kazakhstan, Kiribati, Macao, Niue, Somalia, Venezuela) |
| Newsletter V-5 Archived 2018-12-07 at the Wayback Machine | 2002-05-20 | Change of names and alphabetical code elements of East Timor |
| Newsletter V-6 | 2002-11-15 | Change of names of East Timor |
| Newsletter V-7 Archived 2018-12-07 at the Wayback Machine | 2003-01-14 | Change of official name of Comoros |
| Newsletter V-8 | 2003-07-23 | Deletion of "Yugoslavia"; inclusion of "Serbia and Montenegro" with new alphabetical code elements |
| Newsletter V-9 Archived 2016-03-03 at the Wayback Machine | 2004-02-13 | Inclusion of an entry for Åland Islands |
| Newsletter V-10 Archived 2018-12-07 at the Wayback Machine | 2004-04-26 | Name changes (Afghanistan, Åland Islands) |
| Newsletter V-11 Archived 2018-12-07 at the Wayback Machine | 2006-03-29 | Inclusion of an entry for Jersey, Guernsey and Isle of Man. Change of remark for the United Kingdom |
| Newsletter V-12 | 2006-09-26 | Inclusion of the new entries for "Serbia" and "Montenegro" (replacing Serbia and Montenegro) |
| ISO 3166-1:2006 Archived 2009-07-07 at the Wayback Machine | 2006-11-20 | Second edition of ISO 3166-1 |
| ISO 3166-1:2006/ Cor 1:2007 Archived 2011-06-06 at the Wayback Machine | 2007-07-15 | First Technical Corrigendum to ISO 3166-1:2006 |
| Newsletter VI-1 Archived 2018-09-10 at the Wayback Machine | 2007-09-21 | Assignment of code elements for Saint Barthélemy and Saint Martin and update of France and other French Territories (French Polynesia, French Southern Territories, Guadeloupe, Réunion) |
| Newsletter VI-2 Archived 2018-07-26 at the Wayback Machine | 2008-03-31 | Name changes for Moldova, Montenegro and other minor corrections (Madagascar, Palestinian Territory, Occupied, Saint Barthélemy) |
| Newsletter VI-3 Archived 2018-07-25 at the Wayback Machine | 2008-09-09 | Name change for Nepal and other minor corrections (Greenland, Guernsey, Moldova, Nigeria) |
| Newsletter VI-4 Archived 2018-07-25 at the Wayback Machine | 2009-01-07 | Name change for the Republic of Moldova and other minor corrections (Central African Republic, Comoros) |
| Newsletter VI-5 Archived 2018-07-26 at the Wayback Machine | 2009-03-03 | Name change for Bolivarian Republic of Venezuela and other minor corrections (Kiribati, Tuvalu) |
| Newsletter VI-6 Archived 2018-07-25 at the Wayback Machine | 2009-05-08 | Name change for Plurinational State of Bolivia |
| Newsletter VI-7 Archived 2018-07-20 at the Wayback Machine | 2010-02-22 | Name change for Saint Helena, Ascension and Tristan da Cunha |
| Newsletter VI-8 Archived 2019-08-09 at the Wayback Machine | 2010-12-15 | Code elements for Bonaire, Saint Eustatius and Saba, Curaçao and Sint Maarten (Dutch part), update of other territories (Netherlands, Netherlands Antilles) and minor corrections (Bosnia and Herzegovina, Croatia) |
| Newsletter VI-9 Archived 2019-06-18 at the Wayback Machine | 2011-06-12 (corrected 2011-07-14) | Name changes for Fiji and Myanmar as well as other minor corrections (Åland Islands, Bonaire, Sint Eustatius and Saba, Bulgaria, Netherlands, Niue) |
| Newsletter VI-10 Archived 2018-07-24 at the Wayback Machine | 2011-08-09 | Code elements for South Sudan (and new numeric code for Sudan) |
| Newsletter VI-11 Archived 2019-05-23 at the Wayback Machine | 2011-11-08 | Name change for Libya |
| Newsletter VI-12 Archived 2019-05-23 at the Wayback Machine | 2012-02-15 | Name change for Hungary and other minor corrections (Bangladesh, Bonaire, Sint Eustatius and Saba, Central African Republic, Equatorial Guinea, Eritrea, Germany) |
| Newsletter VI-13 Archived 2019-04-12 at the Wayback Machine | 2012-08-02 | Name change for Eritrea and other minor corrections (Germany, Sri Lanka) |
| Newsletter VI-14 Archived 2013-11-03 at the Wayback Machine | 2013-02-06 | Name change for State of Palestine and other minor corrections (Bulgaria, Bouvet Island, Jersey, Saint Martin (French part), Seychelles, Sint Maarten (Dutch part), Viet Nam) |
| Newsletter VI-15 Archived 2018-07-25 at the Wayback Machine | 2013-05-10 | Name change for Papua New Guinea |
| Newsletter VI-16 Archived 2018-07-24 at the Wayback Machine | 2013-07-11 | Name change for Somalia |
| ISO 3166-1:2013 Archived 2014-03-04 at the Wayback Machine | 2013-11-19 | Third edition of ISO 3166-1 (changes are published in the online catalogue Archived 2022-10-21 at the Wayback Machine of ISO only and no newsletters are published anymore) |
| ISO 3166-1:2020 Archived 2020-12-30 at the Wayback Machine | 2020-08 | Fourth edition of ISO 3166-1 |