Area Code 0342 – Sondrio
The phone area code for Sondrio is 0342 (international format +390342). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 0342
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Sondrio
Geographic Coverage and Administrative Jurisdiction
The Italian national destination code (NDC) 0342 is a geographic area code assigned to the province of Sondrio in the Lombardy region of northern Italy. This numbering area encompasses the city of Sondrio, the provincial capital, and its surrounding municipalities, including key towns such as Morbegno, Tirano, Chiavenna, and Bormio. The code covers the Valtellina and Valchiavenna valleys, extending from the alpine border with Switzerland to the western shores of Lake Como. As a geographic allocation, the prefix is tied to the physical PSTN infrastructure of the region, although modern calls may be routed over IP-based networks.
Dialing Formats and Caller Instructions
For domestic callers within Italy, the number is dialed in full, including the leading zero: 0342 XXX XXX. The national significant number (NSN) for this area code consists of 9 or 10 digits, including the leading zero. For international callers, the Italian country code +39 is used, and the leading zero is dropped. Thus, a typical international format would be +39 342 XXX XXX.
When calling from a foreign country, you must replace the leading zero with the international access prefix (e.g., 00 from most European countries, 011 from North America) followed by Italy's country code 39. For example, to call a number in Sondrio from the United States, you would dial 011 39 342 XXX XXX. From the United Kingdom, you would dial 00 39 342 XXX XXX.
Local callers within the same area code may sometimes dial only the subscriber number without the area code, but this practice is becoming less common with the implementation of mandatory full 10-digit dialing in many regions. It is always safer to include the full national number.
Overlay and Numbering Plan Considerations
As of the current Italian numbering plan, no overlay codes have been introduced for the Sondrio area. The 0342 code remains exclusive to the province, and no other geographic area shares this prefix. However, due to number portability, a subscriber may retain their 0342 number even if they move to a different operator or, in some cases, to a different geographic location, though this is less common for fixed lines.
Practical Usage and Examples
Businesses and residents in the Sondrio area use this code for fixed-line services, including PSTN and VoIP. For instance, a hotel in Bormio might list its number as 0342 901XXX, which would be dialed internationally as +39 342 901XXX. When contacting local services from abroad, always verify the correct number of digits after the area code, as subscriber numbers can vary in length.