Area Code 823 – Nuevo Leon
The phone area code for Nuevo Leon is 823 (international format +52823). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 823
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Nuevo Leon
Geographic Coverage and Administrative Jurisdiction
Area code 823 is a geographic numbering plan area (NPA) within the Mexican national numbering plan, administered under the ITU-T E.164 standard. It serves the northern portion of the state of Nuevo León, specifically the municipality of Anáhuac and its surrounding rural communities. This region borders the U.S. state of Texas and is part of the broader Monterrey metropolitan influence, though it is distinct from the Monterrey urban core (which uses area codes 81 and 82). The code is assigned to fixed-line PSTN services, including residential and business landlines, and is not designated for mobile or nomadic VoIP services.
Primary Cities and Local Dialing Format
The principal locality served by area code 823 is Anáhuac, a small agricultural and border-oriented town. Other nearby communities, such as Nuevo Anáhuac and ejido settlements, also fall under this code. For local calls within the 823 area, users must dial the full 10-digit national number: the two-digit area code (82) followed by the eight-digit subscriber number. For example, a local call to a landline in Anáhuac would be dialed as 823 XXX XXXX. No overlay codes are currently active in this region, so the area code is not optional for local calls.
International Dialing Format
Callers from outside Mexico must dial the international access prefix (e.g., 011 from the U.S. and Canada, 00 from most other countries), followed by Mexico's country code 52, then the area code 823, and the eight-digit local number. For instance, to reach a business in Anáhuac from the United States, one would dial 011 52 823 XXX XXXX. When dialing from a Mexican mobile phone to a landline in the 823 area, the same 10-digit format (823 XXX XXXX) is used, without any additional prefixes.
Caller Instructions and Considerations
For local callers within the 823 region, it is essential to include the area code even for calls to the same city, as the Mexican numbering plan requires 10-digit dialing nationwide. Foreign callers should note that Mexican landline numbers are typically answered with a greeting that includes the last four digits, and that time zone differences (Central Time Zone) may affect business hours. Additionally, while VoIP services can be assigned geographic numbers, the 823 code is primarily associated with traditional copper and fiber-optic PSTN lines. If you are dialing from a mobile phone, ensure that you have the correct international exit code for your country, as some carriers may require a different prefix (e.g., '+' instead of '011').