Area Code 864 – Coahuila
The phone area code for Coahuila is 864 (international format +52864). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 864
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Coahuila
Overview of Area Code 864 (Mexico)
Area code 864 is a geographic National Destination Code (NDC) assigned to the northern Mexican state of Coahuila de Zaragoza. It serves a specific portion of the state, primarily covering the municipalities of Ciudad Acuña, Piedras Negras, and the surrounding region along the U.S.-Mexico border. This area code is part of the national numbering plan managed by the Instituto Federal de Telecomunicaciones (IFT) and is used for fixed-line (PSTN) and some VoIP services.
Geographic Coverage and Administrative Jurisdiction
The 864 area code covers the northern border region of Coahuila, which is strategically important for trade and industry due to its proximity to Texas. Key cities and towns within this code include:
- Ciudad Acuña – a major border city opposite Del Rio, Texas, known for its manufacturing (maquiladora) industry.
- Piedras Negras – another significant border city, located across from Eagle Pass, Texas, with a strong industrial and commercial base.
- Allende, Morelos, Zaragoza, and Nava – smaller municipalities within the same region.
This area code is distinct from other Coahuila codes, such as 844 (Saltillo) and 871 (Torreón), which serve different parts of the state.
Dialing Formats and Caller Instructions
For callers within Mexico, dialing a number in area code 864 requires the national long-distance prefix 01, followed by the area code and the 7-digit local number. For example, to call a fixed line in Piedras Negras from Mexico City, you would dial: 01 864 XXX XXXX.
For international callers, the format is: +52 864 XXX XXXX (the plus sign represents the international access code from your country, e.g., 011 from the U.S. or Canada). Note that the leading 0 is not dialed when calling from abroad.
Local calls within the same area code (e.g., from Ciudad Acuña to Piedras Negras) may be dialed using only the 7-digit local number, depending on the specific local dialing rules. However, it is always safe to use the full national format to avoid errors.
Overlay and Numbering Considerations
As of 2024, there is no overlay area code for 864; it remains the sole code for this region. However, due to population growth and increased demand for telecommunication services, the IFT may introduce an overlay in the future. If an overlay is implemented, 10-digit dialing (area code + number) would become mandatory for all local calls within the region.
It is also important to note that number portability is available in Mexico, meaning that a subscriber may retain their number when switching service providers, but the geographic significance of the area code remains tied to the original location of the number.
Practical Tips for Callers
When calling a number in area code 864 from abroad, always ensure you have the correct country code (+52) and the full 10-digit number (area code + local number). Be mindful of time zones: Coahuila is in the Central Time Zone (UTC-6) and observes daylight saving time from the first Sunday of April to the last Sunday of October, aligning with U.S. Central Time.