---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/glossary/north-american-area-codes#article
headline: What are North American Area Codes?
description: North American Area Codes prefix phone numbers to route calls under the North American Numbering Plan (NANP), covering the US, Canada, US territories, and some Caribbean countries.
url: https://www.twilio.com/docs/glossary/north-american-area-codes
inLanguage: en
dateModified: 2026-07-20T14:57:59.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# What are North American Area Codes?

[Twenty-five North American countries][nanpa-members] share the +1 [country code][ccc] then divide device numbers using assigned prefix numbers to local numbers. These *area codes* assist in routing phone calls.

The [*North American Numbering Plan Administrator*][nanpa] (NANPA) assigns the regional and non-geographic area codes to signatory countries. [*North American Numbering Plan*][nanp] (NANP) covers the United States, Canada, some Caribbean countries, and all US territories. NANPA calls area codes *Number Plan Areas* (NPAs).

* The US covers **317 geographic area codes** and **18 non-geographic** area codes for a total of **335 US area codes.**
* Canada covers **40 geographic area codes** and **two non-geographic area codes** for a total of 42 area codes.
* NANPA publishes two reports of the distribution area codes:
  * [Geographic NPAs][geo-npas] (area codes) in service sorted by number
  * [Non-Geographic NPAs][non-geo-npas] (area codes) in service
* Twilio supports [306 US area codes][twilio-areacodes] on the Twilio platform.

[nanpa-members]: https://en.wikipedia.org/wiki/North_American_Numbering_Plan#NANP_countries_and_territories

[twilio-areacodes]: https://www.twilio.com/en-us/phone-numbers

[ccc]: https://en.wikipedia.org/wiki/List_of_country_calling_codes

[geo-npas]: https://secure.nanpa.com/public-report/npa/geographic-use

[non-geo-npas]: https://secure.nanpa.com/public-report/npa/non-geographic-use

[NANP]: https://en.wikipedia.org/wiki/North_American_Numbering_Plan

[nanpa]: https://www.nanpa.com