Area Code 3405 – San Javier, Santa Fe

Overview of Area Code 3405

Area code 3405 is a geographic National Destination Code (NDC) within the Argentine national numbering plan, assigned to the San Javier department in the northeastern part of Santa Fe Province. This region lies along the Paraná River and is part of the Argentine Littoral. The code serves the city of San Javier (the departmental head) and several smaller towns and rural localities, including Romang, Alejandra, La Brava, and Cacique Ariacaiquín.

Geographic Coverage and Administrative Jurisdiction

San Javier Department is bordered by the Paraná River to the east, which separates it from the province of Corrientes. The area is primarily agricultural, with a strong presence of dairy farming and small-scale industries. The administrative center, San Javier, is located approximately 160 km north of the provincial capital, Santa Fe City. The region is also known for its wetlands and fishing tourism.

Dialing Formats and Call Routing

Within Argentina, calls to numbers in the 3405 area code must include the national trunk prefix 0 followed by the area code and the subscriber number. The subscriber number length in this area is 6 digits, resulting in a total national significant number (NSN) of 10 digits (including the area code).

• Local calls (within the same area code): Dial the 6-digit subscriber number directly. For example, to call a local number 456789, dial 456789.
• National calls from other Argentine cities: Dial 0 + 3405 + subscriber number. For instance, from Buenos Aires, dial 0 3405 456789.
• International calls from abroad: Dial the Argentine country code +54, then the area code 3405 (without the leading 0), followed by the subscriber number. For example, from the United States, dial +54 3405 456789.

Overlay and Numbering Plan Considerations

As of the latest ITU-T E.164 national numbering plan updates, area code 3405 does not have an overlay code. The Argentine national numbering plan is closed, meaning that all local numbers must be dialed with the area code when calling from outside the local area. The country code +54 is used for all international calls into Argentina.

Caller Instructions

For local callers: If you are physically within the San Javier area and calling another local number, you may omit the area code. However, if you are using a mobile phone, it is recommended to always include the area code to avoid misrouting, especially if the number has been ported.

For foreign callers: Always use the international format: +54 3405 [subscriber number]. Do not include the trunk prefix '0' when dialing from abroad. Ensure you have the correct international exit code for your country (e.g., 011 from the US, 00 from most European countries).

Number Portability and VoIP

Argentina implemented mobile number portability, but fixed-line number portability is also available. This means that a number with area code 3405 could theoretically be assigned to a VoIP service or a different operator, but the geographic association remains for routing and emergency services. When calling, the dialing format remains the same regardless of the underlying technology.