Area Code 52 – Istra
The phone area code for Istra is 52 (international format +38552). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 52
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Istra
Overview of +385 52
The +385 52 country calling code prefix is the geographic National Destination Code (NDC) assigned to the Istria County (Istra) region of the Republic of Croatia. This area encompasses the westernmost part of the country, bordering Slovenia and the Adriatic Sea. The code covers the administrative center of Pazin, as well as major coastal cities and towns including Pula, Rovinj, Poreč, Umag, Labin, and Buzet. As a geographic code, it is used for fixed-line PSTN services, and numbers under this prefix are allocated to both residential and business subscribers within the defined geographic area.
Dialing Formats and Usage
When calling a fixed-line number in the Istria region from abroad, the international dialing format is: +385 52 XXX XXX (or +38552XXXXXX when written without spaces). The Croatian national trunk prefix is '0', so domestic callers within Croatia must dial 0 52 XXX XXX from outside the specific local area, or simply 52 XXX XXX if dialing from within the same local calling area (depending on the operator's dialing plan). For example, a typical Pula landline number might be +385 52 123 456. When calling from a mobile phone in Croatia, the same national format applies.
Geographic Coverage and Administrative Details
Istria County is divided into several local administrative units, and the 52 prefix serves all of them. The largest city, Pula, is a major seaport and tourist destination, while Poreč and Rovinj are renowned for their historical sites. The code is managed by the Croatian Regulatory Authority for Network Industries (HAKOM), which oversees number allocation to telecom operators. Since Croatia implemented the EU's universal service obligations, fixed-line numbers under +385 52 are portable among operators within the same geographic area, but they cannot be ported to other geographic regions or to mobile networks.
Caller Instructions
For international callers, always replace the leading '0' of the national significant number with the +385 country code. For example, to call a number in Umag that is locally dialed as 052 789 012, international callers should dial +385 52 789 012. Local callers within Istria can often dial the subscriber number without the area code, but this depends on the specific operator's local dialing rules. For VoIP users, the same international format applies, and it is essential to ensure that your VoIP provider supports geographic number dialing to Croatia.