Area Code 337 – Hisarya
The phone area code for Hisarya is 337 (international format +359337). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 337
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Hisarya
Geographic Overview
The +359 337 area code is a geographic National Destination Code (NDC) assigned to the Hisarya region in Bulgaria. Hisarya is a town in Plovdiv Province, central Bulgaria, renowned for its mineral springs and ancient Roman ruins. The code covers the town itself and the surrounding villages within the Hisarya municipality, including areas such as Belovitsa, Krasnovo, and Starosel. As a geographic code, it is used for fixed-line telephone services connected to the PSTN.
Dialing Formats
When calling a Hisarya number from within Bulgaria, subscribers must dial the trunk prefix '0' followed by the area code '337' and the local subscriber number. For example, a local number might be formatted as 0 337 XXX XXX. From abroad, callers must use the international dialing format: the Bulgarian country code '+359', the area code without the leading '0', and the subscriber number. Thus, the same number would be dialed as +359 337 XXX XXX.
Numbering Structure
Bulgarian geographic numbers typically have a variable length. In the Hisarya area, subscriber numbers are usually 6 or 7 digits long, making the complete national significant number (NSN) 8 or 9 digits. The exact length depends on the specific allocation by the Communications Regulation Commission (CRC). It is important to note that the area code '337' is not an overlay; it is the sole geographic code for Hisarya, and no other area codes share the same region.
Caller Instructions
For local callers within Hisarya, it is still necessary to dial the full national number (including the trunk prefix and area code) for all calls, as per Bulgarian numbering regulations. For international callers, always replace the leading '0' with '+359' when dialing from a mobile phone or use the international access code (e.g., '00' in most European countries) followed by '359' and the area code. Calls to Hisarya from abroad are routed via the Bulgarian PSTN network and are subject to standard international tariffs.
Regulatory and Technical Notes
Geographic numbering in Bulgaria is managed under the ITU-T E.164 recommendation. The CRC allocates number blocks to operators, and number portability is available, meaning a fixed-line number may be moved to a different operator but retains the geographic code. However, the code remains associated with the Hisarya area. For VoIP services, users may be assigned a Hisarya number, but the service is location-independent; nevertheless, the number retains its geographic significance for call routing and emergency services.