Area Code 234 – Aveiro
The phone area code for Aveiro is 234 (international format +351234). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 234
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Aveiro
Geographic Coverage and Administrative Jurisdiction
The +351 234 area code is a geographic National Destination Code (NDC) assigned to the district of Aveiro, located in the Centro region of Portugal. This code serves the city of Aveiro and its surrounding municipalities, including Ílhavo, Estarreja, Murtosa, Albergaria-a-Velha, Águeda, and Oliveira do Bairro. The area is known for its coastal lagoon (Ria de Aveiro), industrial hubs, and the University of Aveiro. The administrative jurisdiction falls under the Autoridade Nacional de Comunicações (ANACOM), Portugal's regulatory authority for telecommunications.
Dialing Formats and Number Structure
Within Portugal, calls to Aveiro numbers require dialing the trunk prefix 0 followed by the area code 234 and the subscriber number. The complete national significant number (NSN) length is 9 digits, including the leading '2' of the area code. For example, a typical local number might be 234 123 456. When calling from abroad, the international format is +351 234 123 456, omitting the trunk prefix '0'. The subscriber number length varies between 6 and 7 digits, depending on the specific allocation.
Local and International Caller Instructions
For local callers within the Aveiro area, it is possible to dial the subscriber number directly without the area code, provided the call originates from within the same geographic exchange. However, for clarity and to avoid misdialing, it is recommended to use the full national format. For callers from other regions of Portugal, dial 0 234 123 456. For international callers, dial +351 234 123 456 from any country. The plus sign represents the international access code, which varies by country (e.g., 00 from most European countries, 011 from North America).
Overlay and Numbering Plan Considerations
Currently, there is no overlay code for the Aveiro area; the 234 code is exclusive to this geographic region. However, number portability allows subscribers to retain their numbers when switching operators, even if they move outside the area, though the geographic association remains. This means that a number with the 234 prefix may no longer be physically located in Aveiro, but the caller is still billed as a local call if dialing from within the area. ANACOM periodically reviews numbering resources to ensure efficient use, but as of now, 234 remains a standard geographic code.
Practical Examples
- Calling a fixed line in Aveiro from Lisbon: 0 234 456 789
- Calling from the United States: 011 351 234 456 789
- Calling from the United Kingdom: 00 351 234 456 789