Area Code 35 – San Antonio, Valparaíso

Geographic Coverage and Administrative Jurisdiction

Area code 35 is a geographic National Destination Code (NDC) assigned to the San Antonio Province and its surrounding localities within the Valparaíso Region of Chile. This area is administered under the jurisdiction of the Valparaíso Regional Government and includes the port city of San Antonio, a critical hub for maritime trade and logistics on Chile's central coast. The code serves the urban centers of San Antonio, Cartagena, El Tabo, El Quisco, Algarrobo, and Santo Domingo, along with adjacent rural districts. These communities form part of the country's fifth administrative region, which is characterized by a mix of coastal tourism, fishing industries, and agricultural production.

Dialing Formats and Number Structure

When calling a fixed-line subscriber in the San Antonio area from within Chile, the national trunk prefix 0 is used, followed by the area code 35 and the subscriber's 7-digit local number. For example, a local call to a business in Cartagena would be dialed as 0 35 2XXX XXX. From abroad, callers must use the international access prefix (typically 00 or +), Chile's country code 56, the area code 35 without the leading 0, and the local number: +56 35 2XXX XXX. It is important to note that the subscriber number is always 7 digits long, and the area code is not separated by a space in official E.164 notation.

Local Dialing and Caller Instructions

For local callers within the 35 area, dialing the 7-digit subscriber number alone is sufficient for calls within the same exchange. However, when calling from other regions of Chile, the full national format (0 35 ...) is mandatory. For international callers, the plus sign (+) and country code are essential; the leading '0' of the national trunk prefix must be omitted. Mobile callers within Chile should always include the area code when dialing a fixed line in San Antonio, as mobile numbers are non-geographic and require the full national number.

Overlay and Numbering Plan Considerations

Currently, area code 35 does not have an overlay code, meaning it is the sole geographic code for the San Antonio region. However, as part of Chile's ongoing numbering plan evolution, the Subsecretaría de Telecomunicaciones (SUBTEL) has implemented measures to ensure number exhaustion is managed efficiently. No changes to the dialing pattern are expected in the near term, but users should remain aware of potential future adjustments.

For businesses and residents, understanding the correct dialing format is crucial for seamless connectivity. Whether you are a tourist calling a hotel in Algarrobo or a logistics company coordinating with the port authority, using the proper country code and area code ensures your call reaches the intended destination without errors.