Area Code 433 – Zacatecas
The phone area code for Zacatecas is 433 (international format +52433). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 433
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Zacatecas
Geographic Coverage and Administrative Jurisdiction
The +52 433 area code is a geographic National Destination Code (NDC) assigned to the central-western region of the state of Zacatecas, Mexico. It serves municipalities including the state capital, Zacatecas City, as well as Guadalupe, Jerez, Fresnillo (partially), and surrounding communities. The code is administered under the jurisdiction of the Federal Telecommunications Institute (IFT) and is allocated for fixed-line PSTN services, although some VoIP providers may route numbers with this prefix.
Dialing Formats and Caller Instructions
For local callers within the 433 area code, the standard national dialing format is 433 XXX XXXX (10 digits total). However, when calling from a mobile phone in Mexico, it is mandatory to prefix the number with +52 or 52 followed by the area code and number. For international callers, the format is +52 433 XXX XXXX. For example, a landline in Zacatecas City with the number 123 4567 would be dialed as +52 433 123 4567 from abroad. Note that Mexico uses an open dialing plan; local calls within the same area code do not require the long-distance prefix '01', but calls from other area codes require dialing 01 433 XXX XXXX.
Overlay and Numbering Considerations
Currently, the 433 area code does not have an overlay code, meaning it is the sole NDC for its geographic region. However, due to increasing demand, the IFT may introduce additional NDCs or overlay codes in the future. Subscribers should be aware that number portability allows users to retain their 433 number when switching providers, even if they move to a different geographic area, which can lead to non-local numbers being associated with this code.
Economic and Social Context
The region is known for its mining industry, colonial heritage, and tourism. Businesses in sectors such as tourism, mining, and agriculture rely heavily on the 433 code for local customer service and administrative lines. For enterprises, having a local 433 number enhances trust and accessibility for customers in the Zacatecas area.
Technical Notes for VoIP and International Calls
When routing calls to 433 numbers over VoIP, ensure that your provider supports E.164 formatting. International carriers must recognize the country code +52 and the NDC 433 to route calls correctly. For SMS, the 433 code is not used for mobile numbers; mobile services in Mexico use dedicated mobile prefixes (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9) under the +52 country code.