Area Code 266 – San Luis, San Luis

Geographic Coverage and Jurisdiction

The +54 266 country and area code combination corresponds to a geographic numbering plan area within the Argentine Republic, specifically serving the province of San Luis and its capital city, also named San Luis. This area code is allocated under the national numbering plan administered by the Ente Nacional de Comunicaciones (ENACOM), following ITU-T E.164 recommendations. The 266 code covers the central-western part of San Luis Province, including the capital and surrounding localities such as Juana Koslay, El Volcán, and Potrero de los Funes. It does not encompass other major cities in the province, like Villa Mercedes, which uses a different area code (2657).

Dialing Formats and Procedures

For callers within Argentina, dialing a number in the San Luis area requires the use of the national trunk prefix 0 followed by the area code 266 and the subscriber number. The subscriber number in this region consists of 7 digits, making the complete national significant number (NSN) 10 digits (0 + 266 + 7 digits). For example, to call a landline in San Luis from another Argentine province, you would dial: 0 266 4XX XXXX.

For international callers, the dialing format is: +54 266 4XX XXXX. The plus sign represents the international access prefix, which varies by country (e.g., 011 from the US, 00 from most European countries). The country code for Argentina is 54, and the area code 266 is dialed without the leading zero. It is important to note that the Argentine numbering plan does not use a separate trunk prefix for international calls; the national trunk prefix '0' is only used for domestic long-distance calls.

Local and Overlay Considerations

Within the 266 area, local calls (within the same area code) are dialed using only the 7-digit subscriber number, without the area code or trunk prefix. For example, a call from one landline to another within San Luis would be dialed as 4XX XXXX. As of the latest ENACOM updates, there is no overlay code for this region; the 266 code is the sole geographic code for the capital area. However, due to the growth of mobile and VoIP services, callers should be aware that number portability allows users to retain their numbers when switching providers, but the geographic significance of the prefix remains for fixed-line services.

Caller Instructions and Practical Tips

For local callers (within Argentina): Always include the trunk prefix '0' when dialing from a mobile phone or from a different area code. For example, from Buenos Aires, you would dial 0 266 4XX XXXX. For foreign callers: Replace the international access code with '+', then dial 54 266 followed by the subscriber number. Ensure you drop the leading '0' of the area code. When saving contacts in a mobile phone, it is recommended to store the number in international format (+54 266 4XX XXXX) to facilitate dialing from anywhere. For calls to emergency services within San Luis, dial the national emergency numbers (e.g., 911, 100, 107), which are independent of the area code.