Area Code 991 – Yucatan
The phone area code for Yucatan is 991 (international format +52991). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 991
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Yucatan
Overview of Area Code 991
Area code 991 is a geographic National Destination Code (NDC) assigned to the southeastern Mexican state of Yucatán, specifically serving the capital city of Mérida and its surrounding metropolitan area. As part of the Mexican numbering plan administered by the Instituto Federal de Telecomunicaciones (IFT), this code follows the ITU-T E.164 international standard, ensuring seamless global connectivity. The region covered by 991 includes Mérida, Progreso, and other municipalities within the central and northern parts of Yucatán, a hub of commerce, tourism, and cultural heritage.
Dialing Formats and Usage
For local callers within the 991 area, the standard format is the 8-digit local number, which must be dialed without the area code. However, when calling from a different area code within Mexico, the full national format is required: 01 991 XXX XXXX. International callers should dial +52 991 XXX XXXX, replacing the leading '0' with the country code and omitting the trunk prefix. For example, to call a landline in Mérida from the United States, one would dial +52 991 123 4567.
It is important to note that Mexico has implemented overlay codes in some regions, but as of now, 991 remains the sole area code for this geographic area, meaning no additional digits are required for local calls. However, users should verify with their service provider, as some mobile networks may require the national format even for local calls due to number portability.
Regulatory and Technical Considerations
The 991 area code is part of the North American Numbering Plan (NANP) indirectly, but Mexico operates its own country code +52, so calls from NANP countries (e.g., USA, Canada) require the international prefix 011 or '+', followed by 52. The Mexican telecom regulator has mandated that all fixed-line numbers have 8 digits, and area codes are assigned based on geographic boundaries. This ensures that calls are routed efficiently through the PSTN and VoIP networks.
For businesses and residents in the 991 region, understanding these dialing rules is crucial for maintaining reliable communication. Whether you are a tourist calling a hotel in Mérida or a multinational company with a branch in Yucatán, using the correct format ensures your call connects without errors. Always confirm the number with the recipient, as mobile numbers in Mexico may be ported and retain their original area code, even if the user moves to a different region.