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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.

Each code consists of two parts, separated by a hyphen. The first part is JP, the ISO 3166-1 alpha-2 code of Japan. The second part is two digits (01–47), which is the Japanese Industrial Standard JIS X 0401 code of the prefecture. The codes are assigned roughly from north to south.

Current codes

Subdivision names are listed as in the ISO 3166-2 standard published by the ISO 3166 Maintenance Agency (ISO 3166/MA).

Code	Subdivision name (ja) (ISO 3602:1989)	Subdivision name (ja) ^{[note 1]}	Subdivision name (en)
JP-23	Aiti	愛知	Aichi
JP-05	Akita	秋田
JP-02	Aomori	青森
JP-38	Ehime	愛媛
JP-21	Gihu	岐阜	Gifu
JP-10	Gunma	群馬
JP-34	Hirosima	広島	Hiroshima
JP-01	Hokkaidô	北海道	Hokkaido
JP-18	Hukui	福井	Fukui
JP-40	Hukuoka	福岡	Fukuoka
JP-07	Hukusima	福島	Fukushima
JP-28	Hyôgo	兵庫	Hyogo
JP-08	Ibaraki	茨城
JP-17	Isikawa	石川	Ishikawa
JP-03	Iwate	岩手
JP-37	Kagawa	香川
JP-46	Kagosima	鹿児島	Kagoshima
JP-14	Kanagawa	神奈川
JP-39	Kôti	高知	Kochi
JP-43	Kumamoto	熊本
JP-26	Kyôto	京都	Kyoto
JP-24	Mie	三重
JP-04	Miyagi	宮城
JP-45	Miyazaki	宮崎
JP-20	Nagano	長野
JP-42	Nagasaki	長崎
JP-29	Nara	奈良
JP-15	Niigata	新潟
JP-44	Ôita	大分	Oita
JP-33	Okayama	岡山
JP-47	Okinawa	沖縄
JP-27	Ôsaka	大阪	Osaka
JP-41	Saga	佐賀
JP-11	Saitama	埼玉
JP-25	Siga	滋賀	Shiga
JP-32	Simane	島根	Shimane
JP-22	Sizuoka	静岡	Shizuoka
JP-12	Tiba	千葉	Chiba
JP-36	Tokusima	徳島	Tokushima
JP-13	Tôkyô	東京	Tokyo
JP-09	Totigi	栃木	Tochigi
JP-31	Tottori	鳥取
JP-16	Toyama	富山
JP-30	Wakayama	和歌山
JP-06	Yamagata	山形
JP-35	Yamaguti	山口	Yamaguchi
JP-19	Yamanasi	山梨	Yamanashi