Area Code 481 – Ciudad Valles, SLP
The phone area code for Ciudad Valles, SLP is 481 (international format +52481). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 481
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Ciudad Valles, SLP
Geographic Coverage and Administrative Jurisdiction
The Mexican area code +52 481 is a geographic National Destination Code (NDC) assigned to the region of Ciudad Valles, in the state of San Luis Potosí (SLP). This code serves the city and its surrounding municipalities, including Tamazunchale, Xilitla, and Aquismón, which are part of the Huasteca Potosina region. The jurisdiction falls under the Secretariat of Infrastructure, Communications and Transportation (SICT) numbering plan, which allocates geographic codes based on local calling areas.
Dialing Formats and Caller Instructions
For local calls within the Ciudad Valles area, callers must dial the 3-digit area code followed by the 7-digit local number, resulting in a 10-digit national format: 481 XXX XXXX. For example, to call a landline in Ciudad Valles from another Mexican state, you would dial 01 481 123 4567. International callers must dial the Mexican country code (+52), then the area code without the leading '0', and the local number: +52 481 123 4567. It is important to note that Mexico uses an open dialing plan; the national long-distance prefix '01' is used only for domestic calls outside the local area, while mobile-to-landline calls may require different prefixes depending on the operator.
Overlay and Numbering Considerations
Currently, there is no overlay code for the 481 area; it is the sole NDC for this geographic region. However, as demand for telephone numbers grows, the Federal Telecommunications Institute (IFT) may introduce overlays or new codes. For now, all new landline numbers in Ciudad Valles are assigned under 481. The number length is fixed at 10 digits (excluding the country code), and the area code is mandatory even for local calls, as per the national numbering plan.
Services and Usage
The 481 area code is used for fixed-line services provided by major carriers such as Telmex, as well as cable operators offering VoIP. It is also used by small and medium enterprises, government offices, and residential users. While mobile numbers in Mexico are non-geographic and typically begin with 1 or 2 (after the country code), landlines under 481 are tied to the geographic location, which is essential for emergency services and location-based routing.
Practical Examples
- Local call (within Ciudad Valles): 481 234 5678
- Domestic long-distance call (from Mexico City): 01 481 234 5678
- International call (from the USA): +52 481 234 5678