Area Code 56 – Gorica/Koper/Postojna

Geographic Coverage and Administrative Jurisdiction

The Slovenian area code 56 is a geographic National Destination Code (NDC) assigned to the western part of the country, encompassing the regions of Gorica (Nova Gorica), Koper, and Postojna. This area covers the Slovenian Littoral and parts of the Inner Carniola, bordering Italy to the west. The code serves both urban centers and rural communities, including the municipalities of Nova Gorica, Šempeter-Vrtojba, Koper, Izola, Piran, Postojna, and their surrounding settlements.

Dialing Formats and Caller Instructions

Within Slovenia, calls to numbers in the 56 area code require dialing the trunk prefix 0 followed by the area code and the subscriber number. The national format is 0 56 XXX XXX (where X represents the local subscriber digits). For example, a local call to a subscriber in Koper would be dialed as 056 123 456.

For international callers, the country calling code for Slovenia is +386. Therefore, the international format becomes +386 56 XXX XXX. When calling from abroad, the leading trunk prefix '0' is omitted. For instance, to reach the same number from outside Slovenia, you would dial +386 56 123 456.

Numbering and Overlay Considerations

Subscriber numbers within the 56 area code typically consist of six digits after the area code, making the total national significant number (NSN) length nine digits (including the leading '0'). There are currently no overlay codes in this region, meaning that local calls within the same area code do not require the area code to be dialed, provided they are within the same local exchange area. However, for calls between different local exchange areas within the 56 region, the full national format (including the area code) is mandatory.

Practical Guidance for Callers

• Local callers (within Slovenia): Dial 0 56 followed by the six-digit subscriber number.
• International callers: Dial your country's international access prefix (e.g., 00 from most European countries), then 386 56, followed by the six-digit subscriber number.
• Mobile calls: When calling a fixed line in this area from a Slovenian mobile phone, the same national format applies: 056 XXX XXX.

This area code is part of the Slovenian numbering plan administered by the Agency for Communication Networks and Services of the Republic of Slovenia (AKOS), in accordance with ITU-T E.164 recommendations. The geographic nature of the code means that tariffs for calls to these numbers are typically based on the distance or the operator's fixed-line pricing structure, though many operators now offer flat-rate national calling plans.