This is the telephone area code (DDD) for Niterói, the city of Rio de Janeiro, and the surrounding metropolitan region.
How to Call Niteroi from Overseas
- Dial your country's exit code (International Access Code)
- Dial 55 (Brazil country code)
- Dial the area code (21)
- Dial the local phone number (8 or 9 digits)
Example: Calling Niteroi from Australia
0011 55 21 9XXXX XXXX
Where:
0011 = Australia exit code
55 = Brazil country code
21 = Area code (covers Niteroi & Rio)
9XXXX XXXX = Local mobile number
Quick Facts
Niteroi Area Code Coverage
The 21 area code covers Niterói and other major cities in the Rio de Janeiro metropolitan area:
Niteroi Coastal
Icaraí, Ingá, Santa Rosa, Boa Viagem, Charitas
Oceanic Region
Itaipu, Piratininga, Camboinhas, Itacoatiara
Rio de Janeiro
The capital city across the Guanabara Bay
Sao Goncalo
Highly populated neighbor and important commercial center
Baixada Fluminense
Duque de Caxias, Nova Iguaçu, São João de Meriti
Marica
Fast-growing coastal city to the east of Niterói
Other Rio de Janeiro State Area Codes
Common Exit Codes for Calling Brazil
When calling Niterói from these countries, use these exit codes:
United States
011
United Kingdom
00
Portugal
00
Japan
010
Canada
011
France
00