Area Code 55 – Mexico City, FD
The phone area code for Mexico City, FD is 55 (international format +5255). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 55
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Mexico City, FD
Geographic Coverage and Administrative Jurisdiction
The +52 55 area code is the designated National Destination Code (NDC) for Mexico City (Ciudad de México, CDMX) and its immediate metropolitan area. This region functions as the federal capital of Mexico and serves as the political, economic, and cultural hub of the country. The code covers all sixteen boroughs (alcaldías) of CDMX, including historic centers like Cuauhtémoc, Coyoacán, and Miguel Hidalgo, as well as key business districts such as Polanco, Santa Fe, and Reforma. Additionally, the 55 code extends to several municipalities in the State of Mexico that form part of the Greater Mexico City urban area, including Naucalpan, Tlalnepantla, Ecatepec, and Nezahualcóyotl. This makes 55 one of the most densely populated and commercially significant numbering areas in the country.
Dialing Formats and Number Structure
Numbers within the 55 area code consist of the country code (+52), the NDC (55), followed by an eight-digit local subscriber number. The complete international format is +52 55 XXXX XXXX, totaling 13 digits when dialed from abroad. For domestic calls placed from other area codes within Mexico, callers must dial the long-distance prefix 01, then 55, followed by the eight-digit number: 01 55 XXXX XXXX. Local calls within the 55 area code do not require the area code; subscribers can simply dial the eight-digit number directly. However, due to the high density of lines, no overlay codes have been introduced, and all new numbers continue to be assigned under 55.
Caller Instructions
For international callers, the sequence is: your country's exit code (e.g., 011 from the US/Canada), then 52, then 55, then the eight-digit number. For example, to call a Mexico City landline, you would dial 011 52 55 1234 5678. When calling from a mobile phone abroad, the plus sign (+) can be used in place of the exit code: +52 55 1234 5678. For domestic callers outside the 55 area, remember to include the national long-distance prefix 01 before the area code. If you are within the 55 area, simply dial the eight-digit number. Note that some mobile numbers may also appear with the 55 prefix, but mobile numbers are non-geographic and are not tied to this area code; always verify whether the number is fixed or mobile.
Regulatory and Technical Notes
The 55 area code is managed by the Federal Telecommunications Institute (IFT) in accordance with the Mexican Numbering Plan. Geographic numbers are primarily assigned to fixed-line operators such as Telmex, Axtel, and Totalplay, but they can also be used for VoIP services that require a physical presence in the area. Number portability allows users to retain their 55 numbers when switching providers, but geographic numbers cannot be moved outside the designated area. For businesses, having a 55 number establishes a local presence in Mexico City, which is essential for customer trust and accessibility.