Area Code 662 – Sonora

Overview of Area Code 662

Area code 662 is a geographic numbering plan area (NPA) in Mexico, assigned under the national numbering plan administered by the Instituto Federal de Telecomunicaciones (IFT). It serves the central and southern portions of the state of Sonora, with its primary hub in the city of Hermosillo, the state capital. The code covers a significant geographic region, including the municipalities of Hermosillo, Ures, Mazatán, and parts of the surrounding rural areas. As a geographic code, it is tied to a specific physical location, and calls are routed based on the destination's central office.

Geographic Coverage and Major Localities

The 662 area code encompasses the capital city, Hermosillo, which is the economic and cultural center of Sonora. Other important localities within this code include Bahía de Kino, a coastal town popular for tourism, and the agricultural communities in the surrounding valleys. The region is characterized by a mix of urban and rural areas, with Hermosillo being the primary population center. For administrative purposes, the code covers the Hermosillo metropolitan area and extends to nearby towns, ensuring that all landlines and mobile numbers assigned within this geographic zone share the 662 prefix.

Dialing Formats and Usage

For local calls within the 662 area code, callers must dial the eight-digit local number preceded by the area code, even for calls within the same city. This is a standard practice in Mexico's closed numbering plan. The national dialing format is: 01 662 XXX XXXX for calls from other Mexican states. Internationally, callers from outside Mexico should dial +52 662 XXX XXXX. For example, to call a landline in Hermosillo from the United States, one would dial +52 662 123 4567. It is important to note that the area code is mandatory for all calls, including local ones, and cannot be omitted.

Overlays and Numbering Changes

Currently, there is no overlay area code for 662; it remains the sole code for this geographic region. However, due to increasing demand for telephone numbers, the IFT may introduce an overlay in the future, which would require ten-digit dialing for all calls. As of now, the 662 code is not subject to any planned changes, but users should stay informed about potential numbering plan modifications.

Caller Instructions

For local callers within the 662 region, dialing the area code plus the seven-digit local number is required. For example, to call a neighbor in Hermosillo, you would dial 662 123 4567. For long-distance calls from other parts of Mexico, dial the national long-distance prefix 01, then the area code and number. International callers must use the country code +52 followed by the area code and number, omitting any leading zero. Mobile numbers in Mexico are also assigned geographic area codes, but they are non-geographic in nature; however, numbers with the 662 prefix are typically associated with mobile services in the Sonora region, and callers should be aware that mobile numbers may be ported to other networks while retaining the 662 prefix.