Area Code 4142 – Korosten, Zhytomyr

Overview of Area Code +380 4142

Area code +380 4142 is a geographic destination code assigned to the city of Korosten and its surrounding districts within the Zhytomyr Oblast of Ukraine. This code is part of the national numbering plan under the ITU-T E.164 standard, which designates the country calling code +380 for Ukraine. The code 4142 is used for fixed-line (PSTN) services, connecting callers to residential, business, and government lines in the region.

Geographic Coverage and Administrative Jurisdiction

Korosten serves as the administrative center of the Korosten Raion (district). The area code covers the city itself and several adjacent settlements within the raion, including villages and smaller towns that rely on the same local exchange infrastructure. The region is located in the northern part of Zhytomyr Oblast, near the border with Belarus, and is an important railway junction. The code is managed by the Ukrainian State Centre of Radio Frequencies and follows the national numbering plan approved by the Ukrainian regulator (NCCIR).

Dialing Formats and Instructions

When dialing a number in Korosten from within Ukraine, you must use the trunk prefix 0 followed by the area code and the subscriber number. The national format is: 0 4142 XX XX XX (where X represents the 6-digit local subscriber number). For example, a local number might be 0 4142 5 12 34.

For international callers, the format is: +380 4142 XX XX XX (or +380 4142 5 12 34). The leading zero of the national trunk prefix is omitted when dialing from abroad. The plus sign (+) represents the international access code from your country (e.g., 00 from most European countries, 011 from North America).

Overlay and Numbering Considerations

As of the latest available data, there is no overlay code for the Korosten area. The area code 4142 is unique to this region, and the local subscriber numbers are 6 digits long. However, due to the ongoing transition to IP-based telephony and the potential for number portability, some numbers may be routed via VoIP networks, but the geographic significance of the code remains unchanged.

Caller Instructions

For local callers within Korosten, it is possible to dial the subscriber number directly (without the area code) if the call is within the same exchange area. However, for calls from other regions of Ukraine, the full national format (0 4142) is required. Foreign callers should always use the international format (+380 4142) to ensure proper routing. Be aware that calls to fixed lines are typically charged at local or national rates depending on your carrier, and international rates apply when calling from outside Ukraine.