Area Code 55 – Kosice
The phone area code for Kosice is 55 (international format +42155). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 55
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Kosice
Geographic Coverage and Administrative Jurisdiction
The +421 55 country and area code combination is the geographic National Destination Code (NDC) assigned to the city of Košice and its surrounding metropolitan area in eastern Slovakia. Košice is the second-largest city in the country and serves as the administrative center of the Košice Region (Košický kraj). The numbering area encompasses not only the city proper but also several nearby districts and municipalities within the historical Košice-okolie (Košice Surroundings) district. This includes towns such as Moldava nad Bodvou and Medzev, as well as numerous smaller villages that rely on the Košice local exchange for their PSTN connectivity.
Dialing Formats and Caller Instructions
When dialing a landline number in Košice from within Slovakia, subscribers must use the national trunk prefix 0 followed by the area code 55 and the subscriber's seven-digit local number. For example, a local Košice number might be dialed as 055 123 4567 from other parts of Slovakia. However, within the Košice area itself, local calls can often be made using only the seven-digit subscriber number, depending on the specific operator's dialing plan.
For international callers, the correct format is the international access prefix (typically + or 00), followed by Slovakia's country code 421, the area code 55 (without the leading zero), and the seven-digit local number. Thus, a caller from abroad would dial +421 55 123 4567. This format is essential for proper routing through international gateways.
Overlay and Numbering Plan Considerations
Currently, the Košice area code 55 does not have an overlay code. The Slovak Telecommunication Office (Úrad pre reguláciu elektronických komunikácií a poštových služieb) has not introduced an overlay for this region, meaning that the area code remains unique for the geographic region. However, as with all geographic codes in Slovakia, number portability allows subscribers to retain their numbers when changing operators, even if they move outside the original geographic area, though the number's geographic significance remains for routing purposes.
Practical Usage and Examples
To illustrate, consider a business in Košice with the local number 987 6543. A customer in Bratislava (area code 02) would dial 055 987 6543. An international partner in Vienna would dial +421 55 987 6543. These examples highlight the importance of using the correct prefix to ensure successful connection.