Area Code 5766 – Kolomak, Kharkiv

Overview of Area Code 5766

Area code 5766 is a geographic destination code within the Ukrainian national numbering plan, assigned to the town of Kolomak and its surrounding rural areas in the Kharkiv Oblast (province) of eastern Ukraine. The code is part of the broader 576 numbering cluster used for the western districts of Kharkiv Oblast, but 5766 specifically routes calls to Kolomak and nearby villages. Administratively, Kolomak is the administrative center of the Kolomatskyi Raion, though recent administrative reforms have merged it into the Bohodukhiv Raion. The code is regulated by the Ukrainian State Service of Special Communication and Information Protection, in accordance with ITU-T E.164 recommendations.

Geographic Coverage and Dialing Formats

The 5766 code serves a predominantly rural area, with Kolomak being the primary town. Other localities within the coverage zone include Shevchenkove, Partyzanske, and several smaller settlements. The subscriber numbers in this area are typically 5 to 6 digits long, resulting in a total national (significant) number length of 9 to 10 digits when combined with the area code.

For callers within Ukraine, the national dialing format is: 0 5766 XXX XX (or 0 5766 XXXXXX for 6-digit local numbers). The leading '0' is the trunk prefix used for domestic calls. For international callers, the country code for Ukraine is +380, so the international format becomes: +380 5766 XXX XX. Note that the trunk prefix '0' is omitted when dialing from abroad.

Caller Instructions

Local callers (within Kolomak area): If you are dialing from a landline within the same local calling area, you may be able to dial just the local subscriber number, but it is always safe to use the full national format. National callers from other regions of Ukraine must dial 0 5766 followed by the local number. International callers should dial +380 5766 followed by the local number, omitting the initial '0'.

Overlay and Numbering Considerations

As of the latest updates, there is no overlay code for the 5766 area. The code is exclusively geographic, meaning it is tied to the physical location of the landline exchange. However, number portability allows subscribers to retain their numbers when changing operators, but the geographic significance remains for routing purposes. Mobile numbers in Ukraine are non-geographic and begin with 3-digit mobile prefixes (e.g., 50, 63, 67), so 5766 is not used for mobile services.

Practical Examples

• To call a Kolomak landline (e.g., 12345) from Kyiv: dial 0 5766 12345.
• To call the same number from the United States: dial 011 380 5766 12345 (or use +380 5766 12345 on mobile).
• To call from a Ukrainian mobile phone: dial 0 5766 12345 (or +380 5766 12345 if using international format).

Always confirm the exact local number length with the called party, as it may vary from 5 to 6 digits.