Area Code 0422 – Treviso

Geographic Coverage and Administrative Jurisdiction

The Italian national destination code (NDC) 0422 is a geographic area code assigned to the Province of Treviso in the Veneto region of northeastern Italy. This code covers the city of Treviso (the provincial capital) and its surrounding municipalities, including but not limited to: Casale sul Sile, Casier, Istrana, Mogliano Veneto, Paese, Ponzano Veneto, Preganziol, Quinto di Treviso, Silea, Spresiano, Villorba, and Zero Branco. The area is part of the wider Venetian plain, bordered by the Piave River to the east and the Sile River to the south.

Administratively, the 0422 area code falls under the jurisdiction of the Italian Communications Regulatory Authority (AGCOM) and follows the national numbering plan as defined by ITU-T E.164. Subscribers within this geographic region are assigned numbers with a total length of 10 digits (including the leading '0'), formatted as 0 422 xxx xxx (where 'x' represents the subscriber number). The first digit after the area code is often used to identify specific exchanges or operator services, but this is not a strict rule due to number portability.

Dialing Formats and Instructions

For callers within Italy, the full national significant number (NSN) must be dialed, which includes the leading '0' of the area code. For example, to call a fixed line in Treviso from another Italian city, dial: 0 422 123 456. The leading '0' is an integral part of the national dialing plan and must not be omitted when dialing from within Italy.

For international callers, the Italian country code (+39) is used, and the leading '0' of the area code is dropped. Thus, from abroad, the same number would be dialed as +39 422 123 456. This is a standard practice for all Italian geographic area codes.

Local calls within the same area code (i.e., between two numbers both starting with 0422) still require dialing the full 10-digit number, as Italy does not use a separate local dialing format. There are no overlay codes in this region; the 0422 code is unique for the Treviso area, and no additional area codes have been introduced.

Caller Instructions and Number Portability

Both local and foreign callers should be aware that number portability is fully implemented in Italy. This means that a number with the 0422 prefix may have been ported to a mobile network or to a different geographic area, although the prefix remains unchanged. Consequently, the geographic association is not absolute, and calls to 0422 numbers may be routed to a mobile or VoIP service. However, for the vast majority of fixed-line subscribers, the geographic location remains as described.

For emergency services, the European emergency number 112 is used, and for other services, standard Italian access codes apply. When dialing from a mobile phone, the same rules apply: the full national number (including the leading '0') must be dialed for domestic calls, and +39 for international calls.