Area code 21
Rio de Janeiro · Rio de Janeiro
- Area code
- 21
- Country
- Brazil
- Region
- Rio de Janeiro
- Major cities
- Rio de Janeiro
- Time zone
- America/Sao_Paulo
- Note
- Rio de Janeiro area code.
This is a domestic area code inside Brazil. It is not the international calling code.
Frequently asked questions
Which cities use area code 21?
Area code 21 serves Rio de Janeiro in Brazil, including Rio de Janeiro.
What region does area code 21 cover?
Area code 21 covers Rio de Janeiro. Area codes route calls to a specific city or region within a country's national telephone network.
What is the difference between an area code and a calling code?
A calling code routes a call across borders to a national network, while an area code routes it to a city or region inside that network. For a Brazil number, the country calling code is the international prefix and 21 is the domestic area code.
What time zone is area code 21 in?
Area code 21 is in the IANA time zone America/Sao_Paulo.
Is area code 21 the international calling code?
No. 21 is a domestic area code inside Brazil, not the international calling code. To call this region from abroad, you dial the country's calling code first, then 21 and the local number.