Area Code 51 – Primorsko-goranska
The phone area code for Primorsko-goranska is 51 (international format +38551). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 51
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Primorsko-goranska
Geographic Overview
The +385 51 country and area code combination is assigned to the Primorsko-Goranska County in Croatia, a region known for its Adriatic coastline and major port city of Rijeka. This geographic prefix covers a significant portion of the Kvarner Gulf area, including the cities of Rijeka, Opatija, Crikvenica, and the islands of Krk, Cres, and Lošinj. As a geographic code, it is tied to the PSTN (Public Switched Telephone Network) infrastructure of this specific region.
Dialing Formats
When calling a landline in this region from abroad, you must use the international format: +385 51 XXX XXX (or +38551XXXXXX when dialed as a continuous string). The national trunk prefix '0' is dropped when dialing from outside Croatia. For example, a local Rijeka number might be 051 123 456 in national format, but becomes +385 51 123 456 internationally. Within Croatia, callers must dial the trunk prefix '0' followed by the area code and subscriber number: 0 51 XXX XXX.
Geographic Coverage and Numbering
The area code 51 is part of Croatia's closed numbering plan, meaning that the full national number (including the leading '0') is always dialed for domestic calls. Subscriber numbers in this area typically consist of six digits, making the total national significant number (NSN) length 8 digits (excluding the trunk prefix). The code is administered by the Croatian Regulatory Authority for Network Industries (HAKOM) and is allocated to fixed-line operators serving the Primorsko-Goranska region. It is important to note that number portability allows subscribers to retain their numbers when changing operators, so the prefix does not necessarily indicate the current operator.
Caller Instructions
For international callers, always use the plus sign (+) or the international access code of your country, followed by 385 (Croatia's country code), then 51, and the six-digit local number. For example, to call a business in Rijeka, you would dial +385 51 234 567. If you are within Croatia but outside the 51 area, you must dial 0 51 234 567. Local calls within the same area code may still require the full national number, depending on the operator's dialing plan.
Overlays and Future Considerations
Currently, there is no overlay code for the 51 area, but as Croatia's telecommunication market evolves, it is advisable to always store numbers in international format (+385 51 ...) to ensure compatibility with VoIP and mobile services. This practice also facilitates call routing in an increasingly IP-based telephony environment.