Area Code 673 – Sinaloa
The phone area code for Sinaloa is 673 (international format +52673). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 673
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Sinaloa
Geographic Coverage and Administrative Jurisdiction
The area code 673 is a geographic National Destination Code (NDC) assigned to the state of Sinaloa, Mexico, under the North American Numbering Plan (NANP) administered by the Federal Telecommunications Institute (IFT). This code serves municipalities in the central-southern part of the state, including the city of Culiacán, the state capital, and its metropolitan area. It also covers nearby localities such as Navolato, Costa Rica, and other surrounding communities within the Culiacán Valley. The jurisdiction aligns with the administrative boundaries of the state, ensuring that calls to this code terminate within the designated geographic region.
Dialing Formats and Caller Instructions
For local callers within the 673 area, it is common to dial the seven-digit local number directly, omitting the area code. However, for calls originating from other parts of Mexico, the full national format must be used: 01 673 XXX XXXX. International callers should dial +52 673 XXX XXXX (or 011 52 673 XXX XXXX from the US/Canada). For example, to call a landline in Culiacán from abroad, you would dial +52 673 123 4567. It is important to note that Mexico has implemented an overlay and ten-digit dialing in many regions, but for this area, the traditional format remains prevalent. Always confirm the exact number with your contact, as local numbers may vary in length.
Network Infrastructure and Numbering Considerations
The 673 code is allocated to both fixed-line and mobile services, although mobile numbers in Mexico are non-geographic and typically use the 1 prefix before the area code when dialed from abroad (e.g., +52 1 673 ...). Fixed-line numbers are assigned to traditional PSTN and VoIP providers, while mobile numbers may be ported across operators. When dialing from a mobile phone within Mexico, it is not necessary to include the national long-distance prefix 01; simply dial the area code and number. For international callers, it is crucial to omit the leading 0 or 1 when using the +52 country code. The IFT regulates number allocation to ensure sufficient capacity for the region's growing telecommunications demand.
Practical Usage and Business Implications
For businesses establishing a presence in Sinaloa, obtaining a local 673 number enhances customer trust and local accessibility. It allows for reduced long-distance charges for local callers and facilitates a regional identity. When integrating these numbers into VoIP systems or call centers, ensure proper configuration for international routing. For tourists or temporary visitors, using a local SIM card or VoIP service can help avoid international roaming fees. Always verify the current dialing procedures with your service provider, as regulations may evolve.