Where is Area Code 21?
Area code 21 is published for Rio de Janeiro metropolitan numbering area in Brazil.
It should be interpreted as a numbering-plan association, not a live geolocation result.
🇧🇷 Brazil geographic code
21 Area Code in Brazil
Rio de Janeiro metropolitan numbering area. This guide separates the geographic area code from country calling code +55 and explains how to write both domestic and international formats.
International prefix+55 21
Domestic: DDD 21Fixed geographic
Quick facts
21 Area Code Overview
CountryBrazil
Country code+55
Domestic area codeDDD 21
Code typeGeographic fixed line
Coverage visualization
Area Code 21 Map
This schematic shows the published numbering association without inventing precise geographic boundaries.
21 · Brazil
Rio de Janeiro metropolitan numbering area
What Time Zone is Area Code 21?
Four principal time zones, from UTC−2 to UTC−5
America/Sao_Paulo: Calculated in your browser
America/Manaus: Calculated in your browser
America/Rio_Branco: Calculated in your browser
America/Noronha: Calculated in your browser
Where a code spans several zones, confirm the destination city before calling.
History
Brazil introduced a ninth digit for mobile numbers gradually between 2012 and 2016, starting with DDD 11 in São Paulo. In 2026, Anatel aligned local fixed-telephone charging areas with the 67 DDD numbering areas without replacing the DDD codes.
Domestic long-distance and outbound international calls use a two-digit carrier selection code. The safest universal representation is the plus format. Mobile number portability means a prefix does not reliably identify the current operator.
Nearby Area Codes
“Nearby” means related entries in this country directory, not a guarantee of a shared physical border.
Brazil
11 Area Code
São Paulo metropolitan numbering area
Brazil61 Area Code
Federal District and nearby Goiás municipalities
Brazil85 Area Code
Fortaleza and nearby Ceará municipalities
Brazil71 Area Code
Salvador metropolitan numbering area
Brazil31 Area Code
Belo Horizonte and nearby Minas Gerais municipalities
Brazil92 Area Code
Manaus and nearby Amazonas municipalities
Top 5 Counties or Regions in Area Code 21
Administrative units and telephone zones are different entity types; the list reflects featured city associations only.
Top 50 Cities in Area Code 21
- Rio de Janeiro — Rio de Janeiro
The directory includes up to 50 verified or clearly qualified city associations and does not claim exhaustive coverage.
Network interpretation
Largest Telephone Carriers
Current operator and market-share data are dynamic. This page avoids assigning a specific number to a carrier from its area code alone.
Landline
Area code 21 is a geographic fixed-line identifier. Consult Agência Nacional de Telecomunicações (Anatel) for live allocation or licensing information.
Wireless
Wireless numbers commonly use separate non-geographic ranges. Number portability prevents reliable current-carrier identification from a prefix alone.
Prefixes
+55+21+subscriber number
Domestic code: DDD 21
International prefix: +55 21
Search by City:
- Rio de Janeiro — Rio de Janeiro
By Number:
A number beginning +55 21 matches this geographic pattern. Keep the remaining subscriber digits intact. This directory does not perform reverse lookup or identify a private subscriber.
Listings by Region or State
More Information
Common questions
21 Area Code FAQ
Where is area code 21?
21 is associated with Rio de Janeiro metropolitan numbering area in Brazil.
How do I call area code 21 from abroad?
Use +55 21 followed by the subscriber number; remove any domestic trunk prefix.
Does area code 21 identify the current caller location?
No. It describes numbering-plan association, while portability, forwarding and internet calling can separate a number from the caller’s current location.