Area Code 520 – Casablanca

Geographic Coverage and Administrative Jurisdiction

The +212 520 prefix is a geographic National Destination Code (NDC) assigned to the Casablanca-Settat region of Morocco, with its primary concentration in the economic capital, Casablanca. This code falls under the administrative jurisdiction of the Agence Nationale de Réglementation des Télécommunications (ANRT), which oversees Morocco's public switched telephone network (PSTN) numbering plan. The 520 prefix serves both fixed-line and, in some cases, nomadic VoIP services within this region, but it is fundamentally tied to the Casablanca metropolitan area, including key districts such as Maarif, Gauthier, and Aïn Diab.

Dialing Formats and Caller Instructions

For local callers within Morocco, the number is dialed in national format as 0520-XXXXXX (10 digits total, including the leading zero). For international callers, the format is +212 520-XXXXXX (or 00212 520-XXXXXX from many countries), where the leading zero is dropped after the country code. When calling from a mobile phone within Morocco, it is essential to include the area code, as mobile numbers are non-geographic and begin with 06 or 07. For example, to call a fixed line in Casablanca from abroad, you would dial: +212 520 123456 (replace with the actual subscriber number).

Overlay Considerations and Numbering Evolution

Casablanca has multiple geographic codes, including 520, 522, and 523, which serve different zones or historical exchanges. There is no overlay in the traditional sense; instead, the ANRT has allocated distinct NDCs to manage capacity and facilitate number portability. Since 2009, Morocco implemented mobile number portability, but fixed-line geographic numbers remain tied to their original location unless ported to a VoIP provider, which may allow relocation within the same region. Callers should be aware that some numbers with the 520 prefix may be VoIP-based, but they still follow the same dialing rules.

Practical Usage and Business Implications

For businesses, having a 520 number signals a local presence in Casablanca, which is crucial for customer trust and regional marketing. It is also used for fax and alarm systems. When dialing from overseas, using the +212 format ensures proper routing through international gateways. For travelers, it is important to note that calls to 520 numbers from foreign mobiles will incur international tariffs, while local calls are charged at domestic rates. Always verify the complete number, as Casablanca numbers are 9 digits after the country code (including the NDC).