how Brazil's DDD area codes work
DDD is the direct-dialing area code that identifies a telephony region in Brazil, assigned by Anatel to a cluster of municipalities, never to a single city. This page explains how this 2-digit code is organized, what changed with the mobile ninth digit, and what the tool returns when you look a DDD up, before you use the search.
The country's most populous DDD covers the São Paulo capital and neighboring municipalities like Guarulhos, Osasco and Santo André, all under the same area code.
A DDD's leading digit follows the same regional logic as the CEP: codes in the 20 range belong to the Southeast region tied to Rio de Janeiro and Espírito Santo.
States with more than one major economic region get several DDDs; Santa Catarina has three others besides 47, one for each relevant population hub.
That is the idea. By informing a valid DDD code, the tool tries to return the state and cities associated with that code according to the consulted dataset.
Starting in 2012, state by state, each state began requiring the digit 9 right after the DDD on mobile numbers, to avoid running out of available combinations; the change finished nationwide in 2016, and today every Brazilian mobile number has 9 digits after the DDD, versus 8 for a landline.
No. Each DDD covers an area that groups a capital or regional hub with several neighboring municipalities; DDD 11, for example, serves São Paulo and dozens of cities in greater São Paulo, so the code alone does not identify a number's exact city.
Anatel, within the national telephony numbering plan, assigns each 2-digit code to a geographic area; the same agency also decided on and coordinated the rollout of the ninth digit on mobile numbers.
Because the number of phone lines possible under a single 2-digit code is limited; states with several large population hubs, like São Paulo or Santa Catarina, get different DDDs for each region, so no single area exhausts the available numbering.
Find the state and cities served by a Brazilian area code (DDD).
Use two digits, for example 11, 21 or 48.
Looked up in real time through J-Kit's secure backend, with validation, timeout and rate limiting. Nothing is stored on your device. Source: official Brazilian public data.