Area Code 647 – Sonora
The phone area code for Sonora is 647 (international format +52647). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 647
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Sonora
Overview of Area Code 647 (Mexico)
Area code 647 is a geographic calling code assigned to the northwestern Mexican state of Sonora, specifically serving the municipality of San Luis Río Colorado and its surrounding areas. This code is part of the national numbering plan administered by the Instituto Federal de Telecomunicaciones (IFT) under the ITU-T E.164 standard. Unlike mobile prefixes, 647 is tied to a fixed geographic location, meaning calls are routed based on the physical location of the line.
Geographic Coverage and Administrative Jurisdiction
The 647 area code covers the city of San Luis Río Colorado, located in the northwest corner of Sonora, bordering the U.S. state of Arizona and the Mexican state of Baja California. The municipality includes the urban area of San Luis Río Colorado and several smaller communities such as Ejido Nuevo León and Golfo de Santa Clara. As a geographic code, it is assigned to fixed-line services, though some carriers may offer VoIP or wireless local loop services under this code.
Dialing Formats and Caller Instructions
For callers within Mexico, the national dialing format requires the long-distance prefix 01 followed by the area code and the local 7-digit number. For example, to call a fixed line in San Luis Río Colorado from elsewhere in Mexico, you would dial: 01 647 XXX XXXX.
For international callers, the format is: +52 647 XXX XXXX. For instance, a call from the United States would be dialed as 011 52 647 XXX XXXX (or +52 647 XXX XXXX on mobile). It is important to note that the area code is not separated by a dash when dialing; the entire number after the country code is continuous.
Overlay Considerations and Numbering Changes
As of the latest IFT updates, area code 647 does not have an overlay. However, due to growing demand, the IFT periodically reviews numbering resources. If an overlay is introduced, local calls within the same area code may require 10-digit dialing (area code + number) even for local calls. Currently, local calls within San Luis Río Colorado can be made using only the 7-digit local number, but this practice may change. Always verify with your carrier for the most current dialing procedures.
Practical Implications for Businesses and Residents
For businesses operating in San Luis Río Colorado, having a 647 number establishes a local presence and can reduce long-distance costs for customers within the region. For residents, understanding the correct dialing format is essential for both domestic and international communication. When traveling abroad, ensure you use the +52 country code and drop any leading '0' from the national prefix.