Area Code 040 – Trieste
The phone area code for Trieste is 040 (international format +39040). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 040
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Trieste
Overview of Italy Area Code 040
Area code 040 is a geographic National Destination Code (NDC) within the Italian national numbering plan, conforming to ITU-T E.164 recommendations. It serves the province of Trieste, located in the Friuli-Venezia Giulia region of northeastern Italy, bordering Slovenia. The code covers the city of Trieste and its surrounding municipalities, including Muggia, Duino-Aurisina, Sgonico, Monrupino, and San Dorligo della Valle. As a geographic code, it is assigned to fixed-line PSTN and VoIP services that are physically located within this designated area.
Dialing Formats and Usage
When calling a landline in Trieste from within Italy, the trunk prefix 0 is dialed before the area code, followed by the subscriber number. The complete national format is 0 40 XXX XXXX (or 040 XXXXXXX), where the subscriber number typically consists of 6 to 7 digits. For international callers, the Italian country code +39 is used, and the leading 0 of the area code is omitted. Thus, an international call would be dialed as +39 40 XXX XXXX. For example, a local Trieste number might appear as 040 123 4567 domestically and +39 40 123 4567 from abroad.
It is important to note that Italy does not use trunk prefixes for mobile numbers, but for geographic numbers, the leading 0 is an integral part of the national dialing sequence. However, when dialing from outside Italy, the 0 is always dropped. Overlay codes are not currently in effect for the 040 area, so no additional dialing changes are required.
Geographic Coverage and Administrative Details
The 040 area code is administered by the Italian Communications Regulatory Authority (AGCOM) and is assigned to Telecom Italia (now TIM) and other licensed operators. The province of Trieste is the smallest in Italy by land area but holds significant historical and commercial importance as a major seaport. The code serves both residential and business lines, including public services and institutions. For callers within Italy, local calls (within the same area code) can be dialed using only the subscriber number, but for clarity, the full national format is recommended. For foreign callers, it is essential to use the international format +39 40 followed by the subscriber number, ensuring that the leading zero is omitted to avoid routing errors.