Area Code 64 – Jeju

Geographic Overview

The +82 64 country calling code and area code combination is assigned to Jeju Province, South Korea's largest island and a special self-governing province. This geographic code covers the entire Jeju administrative region, including Jeju City (제주시) and Seogwipo City (서귀포시), as well as smaller townships and rural districts. As a geographic National Destination Code (NDC), 64 is used exclusively for fixed-line PSTN and VoIP services that are physically or administratively located within the province.

Dialing Formats

For local callers within South Korea, the trunk prefix '0' is used before the area code. To call a Jeju landline from Seoul or any other domestic region, dial: 0-64-XXX-XXXX. For international callers, the country code +82 replaces the trunk prefix, resulting in the format: +82-64-XXX-XXXX. For example, a landline in Jeju City with the local number 712-3456 would be dialed as 064-712-3456 domestically and +82 64 712 3456 from abroad. Note that the leading '0' is always dropped when dialing from outside South Korea.

Number Structure and Overlays

Jeju landline numbers consist of the area code (64) followed by a seven-digit subscriber number. The first digit of the subscriber number often indicates the specific central office or district, but this is not a strict rule due to number portability. There are no overlay codes in Jeju; the 64 code is the sole geographic code for the province. However, mobile numbers in Jeju use the same nationwide mobile prefixes (e.g., 010, 011) and are not tied to the 64 code.

Caller Instructions

For domestic callers: always include the trunk prefix '0' when dialing from another area code. For example, from Busan, dial 064-712-3456. For international callers: replace the '0' with the South Korea country code +82, so dial +82 64 712 3456. If you are physically in Jeju and calling another Jeju landline, you may omit the area code and dial just the seven-digit number, but including the area code is always safe and recommended for clarity.

Regulatory and Technical Notes

The 64 code is managed by the Korea Communications Commission (KCC) and allocated to fixed-line operators such as KT, SK Broadband, and LG U+. Since the early 2000s, number portability allows subscribers to retain their numbers when switching operators, but the geographic significance remains. VoIP services registered to Jeju addresses may also use the 64 code, but they are subject to the same dialing rules. For emergency services, dial 112 from any phone in South Korea.