Referential Overview


The simplicity and speed of the API makes Referential ideal for direct invocation from forms, UX components, mobile apps and other mission critical applications where responsiveness and latency matter.

More complete documentation at our site:

We offer fast and global APIs to:

  • list or search countries in 20 languages
  • list or search state or country regions
  • lookup international zip codes
  • lookup international country and area codes
  • time zone
  • international holidays

The APIs are designed to work together with values naturally flowing as outputs and inputs between the different endpoints.

We live in a globalized world. All APIs are localized to multiple languages and in some cases up to 20 languages. Endpoints are globally distributed and cached via CDN for maximum global availability, stability and speed.


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