Area Code 1 – Zagreb
The phone area code for Zagreb is 1 (international format +3851). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 1
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Zagreb
Geographic Coverage and Administrative Significance
The area code 1 is the geographic National Destination Code (NDC) assigned to the City of Zagreb, the capital and largest city of the Republic of Croatia. It serves the entire administrative territory of the City of Zagreb, which functions as a separate territorial unit with county-level authority. The code covers all urban and suburban districts within the city limits, including the central business district, residential zones, and industrial areas. As the political, economic, and cultural hub of the country, Zagreb hosts the headquarters of major national institutions, corporations, and international organizations, making this code one of the most dialed in Croatia.
Dialing Formats and Number Structure
In the international format, numbers are written as +385 1 XXX XXXX, where +385 is the country calling code for Croatia, 1 is the NDC, and the subscriber number consists of seven digits. The total length of a national significant number (NSN) is eight digits, excluding the leading trunk prefix. When dialing domestically from within Croatia, callers must use the trunk prefix 0 before the area code, resulting in the format 01 XXX XXXX. For example, a Zagreb landline number might be dialed as 01 234 5678 domestically and as +385 1 234 5678 from abroad. It is important to note that the leading 0 is not part of the international number and must be omitted when dialing from outside Croatia.
Caller Instructions and Overlay Considerations
Local callers within Zagreb can often dial the seven-digit subscriber number directly without the area code, depending on the specific local dialing rules. However, for clarity and to avoid misdialing, it is recommended to always include the area code when dialing from mobile phones or when the call originates from outside the Zagreb calling area. As of the latest numbering plan updates, there is no overlay code in Zagreb; the 1 code remains the sole geographic code for the city. Callers from other countries should replace the international access prefix (00 or +) with their country's specific exit code when dialing from a landline, but mobile users can simply use the + sign followed by 385 1 and the subscriber number.
Regulatory and Technical Notes
The allocation and management of the 1 area code are overseen by the Croatian Regulatory Authority for Network Industries (HAKOM), which ensures compliance with ITU-T E.164 recommendations. The code is designated exclusively for fixed-line PSTN and VoIP services that are geographically tied to Zagreb. Number portability allows subscribers to retain their numbers when changing operators, but the geographic association remains. This means that a number with the 1 code will always be associated with the Zagreb region, regardless of the underlying technology or service provider.