menu_bookHREFLANG GUIDE

List of valid ISO codes

Reference lists of language and country codes used in hreflang tags — sourced from ISO 639-1 and ISO 3166.

ISO 639-1 codes

The ISO 639-1 codes are standardized two-letter codes used to represent languages. They are part of the ISO 639 standard maintained by the International Organization for Standardization.

In short: ISO 639-1 codes are two-letter abbreviations (like en for English or fr for French) used to identify languages in software, websites, and international systems.

They're commonly used in:

Web content (lang="en")
Locale settings (en_US, fr_CA) — combined with ISO 3166
Translation files
APIs and databases

1–10 of 185 languages

Code	Name	Native
aa	Afar	Afar
ab	Abkhazian	Аҧсуа
af	Afrikaans	Afrikaans
ak	Akan	Akana
am	Amharic	አማርኛ
an	Aragonese	Aragonés
ar	Arabic	العربية
as	Assamese	অসমীয়া
av	Avar	Авар
ay	Aymara	Aymar

ISO 3166 codes

ISO 3166 is a globally recognized standard that assigns unique short codes to countries and territories (e.g. US for the United States, FR for France).

These standardized country codes are essential in SEO, international targeting, and geolocation, especially when configuring hreflang tags combined with ISO 639-1 (hreflang="en-US" for English localized in USA).

By using ISO 3166 codes correctly, websites can:

Improve multilingual SEO through accurate language and country targeting.
Enhance user experience by serving content tailored to the visitor's location.
Support structured data, international redirects, and analytics tracking.

1–10 of 249 countries

Code	Country
AD	🇦🇩 Andorra
AE	🇦🇪 United Arab Emirates
AF	🇦🇫 Afghanistan
AG	🇦🇬 Antigua and Barbuda
AI	🇦🇮 Anguilla
AL	🇦🇱 Albania
AM	🇦🇲 Armenia
AO	🇦🇴 Angola
AQ	🇦🇶 Antarctica
AR	🇦🇷 Argentina

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