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Encyclopedic overview
ISO 3166-2:JP is the entry for Japan in ISO 3166-2, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), which defines codes for the names of the principal subdivisions (e.g. provinces or states) of all countries coded in ISO 3166-1.
Currently for Japan, ISO 3166-2 codes are defined for 47 prefectures.
Excerpted from Wikipedia’s “Q456671” article, available under the CC BY-SA 4.0 licence.