Area Code 366 – Kastamonu
The phone area code for Kastamonu is 366 (international format +90366). Browse local exchange codes (NXX) and carrier assignments below.
📍 Geographic Location of Kastamonu
Overview of Area Code +90 366
Area code 366 is a geographic National Destination Code (NDC) within the Turkish national numbering plan, assigned to the province of Kastamonu in the Western Black Sea region of Türkiye. This code is used for fixed-line (PSTN) services within the province, including the central district and its connected towns and villages.
Geographic Coverage and Administrative Jurisdiction
The 366 area code covers the entire administrative province of Kastamonu, which is subdivided into districts such as Taşköprü, Tosya, İnebolu, Cide, and Araç. The province is bordered by the Black Sea to the north and is known for its historical sites and natural landscapes. The main city, Kastamonu, serves as the provincial capital and is the primary urban center within the code area.
Dialing Formats and Caller Instructions
For callers within Türkiye, the national dialing format for a Kastamonu fixed-line number is:
- 0 366 XXX XX XX (when dialing from a Turkish mobile or fixed line outside the area code)
- 366 XXX XX XX (when dialing from another landline within the same area code, though local calls may require only the subscriber number depending on the operator's configuration)
For international callers, the format is:
- +90 366 XXX XX XX (replace the leading zero with the international access code, e.g., 00 from most countries)
Example: A number in Kastamonu might be +90 366 212 34 56. When calling from abroad, dial your country's exit code, then 90, then 366, followed by the 7-digit subscriber number.
Overlay and Numbering Considerations
As of the latest ITU-T E.164 records, there is no overlay code for the 366 area. The province uses a single NDC, and the subscriber number length is 7 digits. This means the total national significant number (NSN) length is 10 digits (including the leading 0 for national dialing).
Practical Information for Callers
When calling a Kastamonu number from a mobile phone in Türkiye, you must always dial the leading 0 followed by 366. For international callers, ensure you have the correct country code (+90) and drop the leading 0. Calls to this geographic code are typically charged at standard domestic rates for calls within Türkiye, and international rates apply for calls from abroad. It is always advisable to check with your service provider for specific tariffs.