There are,, 165 members of the International Organization for Standardization. Three types of membership status can be distinguished:[1]
| Country A2 code | Country A3 code | Country code No. | Country name (English) | Standards body | ISO status | |
|---|---|---|---|---|---|---|
| AF | AFG | 004 | Afghanistan | ANSA | Member body | |
| AL | ALB | 008 | Albania | DPS | Correspondent member | |
| DZ | DZA | 012 | Algeria | IANOR | Member body | |
| AO | AGO | 024 | Angola | IANORQ | Correspondent member | |
| AG | ATG | 028 | Antigua and Barbuda | ABBS | Subscriber member | |
| AR | ARG | 032 | Argentina | IRAM | Member body | |
| AM | ARM | 051 | Armenia | SARM | Member body | |
| AU | AUS | 036 | Australia | SA | Member body | |
| AT | AUT | 040 | Austria | ASI | Member body | |
| AZ | AZE | 031 | Azerbaijan | AZSTAND | Member body | |
| BS | BHS | 044 | Bahamas | BBSQ | Correspondent member | |
| BH | BHR | 048 | Bahrain | BSMD | Member body | |
| BD | BGD | 050 | Bangladesh | BSTI | Member body | |
| BB | BRB | 052 | Barbados | BNSI | Member body | |
| BY | BLR | 112 | Belarus | BELST | Member body | |
| BE | BEL | 056 | Belgium | NBN | Member body | |
| BZ | BLZ | 084 | Belize | BZBS | Correspondent member | |
| BJ | BEN | 204 | Benin | CEBENOR | Member body | |
| BT | BTN | 064 | Bhutan | SQCA | Correspondent member | |
| BO | BOL | 068 | Bolivia, Plurinational State of | IBNORCA | Correspondent member | |
| BA | BIH | 070 | Bosnia and Herzegovina | BASMP | Member body | |
| BW | BWA | 072 | Botswana | BOBS | Member body | |
| BR | BRA | 076 | Brazil | ABNT | Member body | |
| BN | BRN | 096 | Brunei Darussalam | CPRU | Correspondent member | |
| BG | BGR | 100 | Bulgaria | BDS | Member body | |
| BF | BFA | 854 | Burkina Faso | FASONORM | Member body | |
| BI | BDI | 108 | Burundi | BBN | Correspondent member | |
| KH | KHM | 116 | Cambodia | ISC | Correspondent member | |
| CM | CMR | 120 | Cameroon | CDNQ | Member body | |
| CA | CAN | 124 | Canada | SCC | Member body | |
| CV | CPV | 132 | Cape Verde | — | ||
| CF | CAF | 140 | Central African Republic | — | ||
| TD | TCD | 148 | Chad | — | ||
| CL | CHL | 52 | Chile | INN | Member body | |
| CN | CHN | 156 | China | SAC | Member body | |
| CO | COL | 170 | Colombia | ICONTEC | Member body | |
| KM | COM | 174 | Comoros | — | ||
| CG | COG | 178 | Congo | — | ||
| CD(ZR) | COD | 180 | Congo, Democratic Republic of the | OCC | Member body | |
| CR | CRI | 188 | Costa Rica | INTECO | Member body | |
| CI | CIV | 384 | Côte d'Ivoire | CODINORM | Member body | |
| HR | HRV | 191 | Croatia | HZN | Member body | |
| CU | CUB | 192 | Cuba | NC | Member body | |
| CY | CYP | 196 | Cyprus | CYS | Member body | |
| CZ | CZE | 203 | Czech Republic | ÚNMZ | Member body | |
| DK | DNK | 208 | Denmark | DS | Member body | |
| DJ | DJI | 262 | Djibouti | — | ||
| DM | DMA | 212 | Dominica | DBOS | Correspondent member | |
| DO | DOM | 214 | Dominican Republic | INDOCAL | Member body | |
| EC | ECU | 218 | Ecuador | INEN | Member body | |
| EG | EGY | 818 | Egypt | EOS | Member body | |
| SV | SLV | 222 | El Salvador | CONACYT | Member body | |
| GQ | GNQ | 226 | Equatorial Guinea | — | ||
| ER | ERI | 232 | Eritrea | ESI | Correspondent member | |
| EE | EST | 233 | Estonia | EVS | Member body | |
| SZ | SWZ | 748 | Eswatini | SWASA | Correspondent member | |
| ET | ETH | 231 | Ethiopia | IES | Member body | |
| FJ | FJI | 242 | Fiji | FTSQCO | Member body | |
| FI | FIN | 246 | Finland | SFS | Member body | |
| FR | FRA | 250 | France | AFNOR | Member body | |
| GA | GAB | 266 | Gabon | CNTT | Member body | |
| GM | GMB | 270 | Gambia | TGSB | Correspondent member | |
| GE | GEO | 268 | Georgia | GEOSTM | Correspondent member | |
| DE | DEU | 276 | Germany | DIN | Member body | |
| GH | GHA | 288 | Ghana | GSB | Member body | |
| GR | GRC | 300 | Greece | ELOT | Member body | |
| GD | GRD | 308 | Grenada | — | ||
| GT | GTM | 320 | Guatemala | COGUANOR | Correspondent member | |
| GN | GIN | 324 | Guinea | INNM | Correspondent member | |
| GW | GNB | 624 | Guinea-Bissau | DSNPQ | ||
| GY | GUY | 328 | Guyana | GNBS | Correspondent member | |
| HT | HTI | 332 | Haiti | BHN | Correspondent member | |
| HN | HND | 340 | Honduras | COHCIT | Subscriber member | |
| HK | HKG | 344 | Hong Kong (China) | ITCHKSAR | Correspondent member | |
| HU | HUN | 348 | Hungary | MSZT | Member body | |
| IS | ISL | 352 | Iceland | IST | Member body | |
| IN | IND | 356 | India | BIS | Member body | |
| ID | IDN | 360 | Indonesia | BSN | Member body | |
| IR | IRN | 364 | Iran, Islamic Republic of | ISIRI | Member body | |
| IQ | IRQ | 368 | Iraq | COSQC | Member body | |
| IE | IRL | 372 | Ireland | NSAI | Member body | |
| IL | ISR | 376 | Israel | SII | Member body | |
| IT | ITA | 380 | Italy | UNI | Member body | |
| JM | JAM | 388 | Jamaica | JBS | Member body | |
| JP | JPN | 392 | Japan | JISC | Member body | |
| JO | JOR | 400 | Jordan | JISM | Member body | |
| KZ | KAZ | 398 | Kazakhstan | KAZMEMST | Member body | |
| KE | KEN | 404 | Kenya | KEBS | Member body | |
| KI | KIR | 296 | Kiribati | — | ||
| KP | PRK | 408 | Korea, Democratic People's Republic of | CSK | Member body | |
| KR | KOR | 410 | Korea, Republic of | KATS | Member body | |
| KW | KWT | 414 | Kuwait | KOWSMD | Member body | |
| KG | KGZ | 417 | Kyrgyzstan | KYRGYZST | Correspondent member | |
| LA | LAO | 418 | Lao People's Democratic Republic | DISM | Subscriber member | |
| LV | LVA | 428 | Latvia | LVS | Member body | |
| LB | LBN | 422 | Lebanon | LIBNOR | Member body | |
| LS | LSO | 426 | Lesotho | LSQAS | Correspondent member | |
| LR | LBR | 430 | Liberia | — | ||
| LY | LBY | 434 | Libya | LNCSM | Member body | |
| LI | LIE | 438 | Liechtenstein | — | ||
| LT | LTU | 440 | Lithuania | LST | Correspondent member | |
| LU | LUX | 442 | Luxembourg | SEE | Member body | |
| MO | MAC | 446 | Macao (China) | CPTTM | Correspondent member | |
| MG | MDG | 450 | Madagascar | BNM | Correspondent member | |
| MW | MWI | 454 | Malawi | MBS | Member body | |
| MY | MYS | 458 | Malaysia | DSM | Member body | |
| MV | MDV | 462 | Maldives | — | ||
| ML | MLI | 466 | Mali | MLIDNI | Member body | |
| MT | MLT | 470 | Malta | MSA | Member body | |
| MH | MHL | 584 | Marshall Islands | — | ||
| MR | MRT | 478 | Mauritania | — | Correspondent member | |
| MU | MUS | 480 | Mauritius | MSB | Member body | |
| MX | MEX | 484 | Mexico | DGN | Member body | |
| FM | FSM | 583 | Micronesia, Federated States of | — | ||
| MD | MDA | 498 | Moldova, Republic of | MOLDST | Correspondent member | |
| MC | MCO | 492 | Monaco | — | ||
| MN | MNG | 496 | Mongolia | MASM | Member body | |
| ME | MNE | 499 | Montenegro | ISME | Correspondent member | |
| MA | MAR | 504 | Morocco | SNIMA | Member body | |
| MZ | MOZ | 508 | Mozambique | INNOQ | Correspondent member | |
| MM | MMR | 104 | Myanmar | MSTRD | Correspondent member | |
| NA | NAM | 516 | Namibia | NSIQO | Member body | |
| NR | NRU | 520 | Nauru | — | ||
| NP | NPL | 524 | Nepal | NBSM | Member body | |
| NL | NLD | 528 | Netherlands | NEN | Member body | |
| NZ | NZL | 554 | New Zealand | SNZ | Member body | |
| NI | NIC | 558 | Nicaragua | DTNM | Correspondent member | |
| NE | NER | 562 | Niger | DNQM | Correspondent member | |
| NG | NGA | 566 | Nigeria | SON | Member body | |
| MK | MKD | 807 | North Macedonia | ISRM | Member body | |
| NO | NOR | 578 | Norway | SN | Member body | |
| OM | OMN | 512 | Oman | DGSM | Member body | |
| PK | PAK | 586 | Pakistan | PSQCA | Member body | |
| PW | PLW | 585 | Palau | — | ||
| PS | PSE | 275 | Palestine, State of[2] | PSI | Correspondent member | |
| PA | PAN | 591 | Panama | COPANIT | Member body | |
| PG | PNG | 598 | Papua New Guinea | NISIT | Correspondent member | |
| PY | PRY | 600 | Paraguay | INTN | Correspondent member | |
| PE | PER | 604 | Peru | INACAL | Member body | |
| PH | PHL | 608 | Philippines | BPS | Member body | |
| PL | POL | 616 | Poland | PKN | Member body | |
| PT | PRT | 620 | Portugal | IPQ | Member body | |
| QA | QAT | 634 | Qatar | QS | Member body | |
| RO | ROU | 642 | Romania | ASRO | Member body | |
| RU | RUS | 643 | Russian Federation | GOST R | Member body | |
| RW | RWA | 646 | Rwanda | RBS | Member body | |
| KN | KNA | 659 | Saint Kitts and Nevis | — | ||
| LC | LCA | 662 | Saint Lucia | SLBS | Member body | |
| VC | VCT | 670 | Saint Vincent and the Grenadines | SVGBS | Subscriber member | |
| WS | WSM | 882 | Samoa | — | ||
| SM | SMR | 674 | San Marino | — | ||
| ST | STP | 678 | Sao Tome and Principe | — | ||
| SA | SAU | 682 | Saudi Arabia | SASO | Member body | |
| SN | SEN | 686 | Senegal | ASN | Member body | |
| RS | SRB | 891 | Serbia | ISS | Member body | |
| SC | SYC | 690 | Seychelles | SBS | Correspondent member | |
| SL | SLE | 694 | Sierra Leone | — | Correspondent member | |
| SG | SGP | 702 | Singapore | SPRING SG | Member body | |
| SK | SVK | 703 | Slovakia | SUTN | Member body | |
| SI | SVN | 705 | Slovenia | SIST | Member body | |
| SB | SLB | 090 | Solomon Islands | — | ||
| SO | SOM | 706 | Somalia | — | ||
| ZA | ZAF | 710 | South Africa | SABS | Member body | |
| SS | SSD | 728 | South Sudan | |||
| ES | ESP | 724 | Spain | AENOR | Member body | |
| LK | LKA | 144 | Sri Lanka | SLSI | Member body | |
| SD | SDN | 729 | Sudan | SSMO | Member body | |
| SR | SUR | 740 | Suriname | SSB | Correspondent member | |
| SE | SWE | 752 | Sweden | SIS | Member body | |
| CH | CHE | 756 | Switzerland | SNV | Member body | |
| SY | SYR | 760 | Syrian Arab Republic | SASMO | ||
| TW | TWN | 158 | Taiwan | BSMI/TAF | ||
| TZ | TZA | 834 | Tanzania, United Republic of | TBS | Member body | |
| TJ | TJK | 762 | Tajikistan | TJKSTN | Correspondent member | |
| TH | THA | 764 | Thailand | TISI | Member body | |
| TL | TLS | 206 | Timor-Leste | — | ||
| TG | TGO | 768 | Togo | CSN | ||
| TO | TON | 776 | Tonga | — | ||
| TT | TTO | 780 | Trinidad and Tobago | TTBS | Member body | |
| TN | TUN | 788 | Tunisia | INNORPI | Member body | |
| TR | TUR | 792 | Turkey | TSE | Member body | |
| TM | TKM | 795 | Turkmenistan | MSST | Correspondent member | |
| TV | TUV | 798 | Tuvalu | — | ||
| UG | UGA | 800 | Uganda | UNBS | Member body | |
| UA | UKR | 804 | Ukraine | [3] | Member body | |
| AE | ARE | 784 | United Arab Emirates | ESMA | Member body | |
| GB | GBR | 826 | United Kingdom of Great Britain and Northern Ireland | BSI | Member body | |
| US | USA | 840 | United States of America | ANSI | Member body | |
| UY | URY | 858 | Uruguay | UNIT | Member body | |
| UZ | UZB | 860 | Uzbekistan | UZSTANDARD | Member body | |
| VU | VUT | 548 | Vanuatu | — | ||
| VA | VAT | 336 | Vatican City | — | ||
| VE | VEN | 862 | Venezuela, Bolivarian Republic of | FONDONORMA | ||
| VN | VNM | 704 | Viet Nam | TCVN | Member body | |
| EH | ESH | 732 | Western Sahara | — | ||
| YE | YEM | 887 | Yemen | YSMO | Member body | |
| ZM | ZMB | 894 | Zambia | ZABS | Correspondent member | |
| ZW | ZWE | 816 | Zimbabwe | SAZ | Member body |