Area Code 6042 – Medellín

Overview of Colombia's +57 6042 Geographic Code

The +57 6042 prefix is a geographic National Destination Code (NDC) assigned to the city of Medellín, the capital of the Antioquia department, and its immediate metropolitan area. This code is part of the larger 604 area code, which historically served the entire Antioquia region. The 6042 prefix specifically identifies landline numbers within Medellín's urban core and surrounding municipalities, including Bello, Envigado, Itagüí, and Sabaneta.

Under the ITU-T E.164 international numbering plan, a complete number for a Medellín landline is structured as: +57 604 2XX XXXX, where +57 is Colombia's country calling code, 604 is the national destination code for Antioquia, and the subsequent digits (2XX XXXX) form the subscriber number. The leading '2' after the area code is a central office prefix that routes calls to specific exchanges within the city.

Dialing Formats and Caller Instructions

For international callers, the correct format is: +57 604 2XX XXXX (or 0057 604 2XX XXXX from countries using the international prefix 00). When dialing from within Colombia but outside the 604 area, you must use the national trunk prefix '0' followed by the area code and subscriber number: 0 604 2XX XXXX. Local calls within Medellín and its metropolitan area do not require the area code; simply dial the 7-digit subscriber number (2XX XXXX).

It is important to note that Colombia has implemented mobile number portability and fixed-line number portability, but geographic numbers like 6042 are tied to the physical location of the line. If you are calling a Medellín business or resident, ensure you have the correct 7-digit local number. For example, a typical Medellín landline might be +57 604 234 5678.

Regulatory and Technical Considerations

The 6042 prefix is regulated by the Comisión de Regulación de Comunicaciones (CRC) of Colombia. All landline numbers in the 604 area are allocated to fixed-line operators such as ETB, Claro, Movistar, and Tigo, among others. Calls to these numbers are typically charged at local rates when dialed from within the same NDC, but long-distance charges apply when dialing from other regions of Colombia.

For VoIP users, it is essential to include the country code and area code when configuring dial plans. Some VoIP providers may require the national trunk prefix '0' for domestic calls. Always verify with your service provider to ensure proper routing.