Atlas

Area codes
of Japan

A Japanese number is ten digits, the first of them the trunk 0, and the area code takes anything from one more digit to four: 03 is Tokyo, 06 Osaka, 011 Sapporo, 0138 Hakodate, 01398 a corner of two towns in southern Hokkaido. There are three hundred and ninety of them, handed out from north to south, and this map gathers them by their first three digits into the fifty-nine groups the plan is organised in. The colour is the first digit — nine regions, from Hokkaido's 01 to Kyūshū's 09.

Grouping
017 — Aomori018 — Akita019 — Morioka022 — Sendai023 — Yamagata024 — Fukushima, Iwaki025 — Niigata026 — Nagano027 — Maebashi028 — Utsunomiya029 — Mito03 — Tokyo042 — Tokorozawa043 — Chiba044 — Kawasaki045 — Yokohama046 — Yokosuka, Fujisawa047 — Kashiwa, Kamogawa048 — Kawaguchi049 — Kawagoe052 — Nagoya053 — Hamamatsu, Toyohashi054 — Shizuoka055 — Kofu056 — Okazaki, Toyota057 — Tajimi, Takayama058 — Gifu, Ichinomiya059 — Tsu06 — Osaka072 — Sakai073 — Wakayama074 — Nara075 — Kyoto076 — Kanazawa, Suzu077 — Ōtsu, Fukui078 — Kobe079 — Kasai, Kakogawa082 — Hiroshima083 — Yamaguchi084 — Fukuyama085 — Matsue, Tottori086 — Okayama, Kurashiki087 — Takamatsu088 — Tokushima089 — Matsuyama092 — Fukuoka093 — Kitakyushu094 — Kurume095 — Nagasaki, Saga096 — Kumamoto097 — Ōita098 — Naha, Miyazaki099 — KagoshimaAomoriIwateMiyagiAkitaYamagataFukushimaIbarakiTochigiGunmaSaitamaChibaTokyoKanagawaNiigataToyamaIshikawaFukuiYamanashiNaganoGifuShizuokaAichiMieShigaKyotoOsakaHyōgoNaraWakayamaTottoriShimaneOkayamaHiroshimaYamaguchiTokushimaKagawaEhimeKōchiFukuokaSagaNagasakiKumamotoŌitaMiyazakiKagoshima017Aomori018Akita019Morioka022Sendai023Yamagata024Fukushima, Iwaki025Niigata026Nagano027Maebashi028Utsunomiya029Mito03Tokyo042Tokorozawa043Chiba044045046Yokosuka, Fujisawa047Kashiwa, Kamogawa048Kawaguchi049Kawagoe052Nagoya053Hamamatsu, Toyohashi054Shizuoka055Kofu056057Tajimi, Takayama058Gifu, Ichinomiya059Tsu06072Sakai073Wakayama074075Kyoto076Kanazawa, Suzu077Ōtsu, Fukui078Kobe079Kasai, Kakogawa082Hiroshima083Yamaguchi084Fukuyama085Matsue, Tottori086Okayama, Kurashiki087Takamatsu088Tokushima089Matsuyama092Fukuoka093Kitakyushu094095Nagasaki, Saga096Kumamoto097Ōita098Naha, Miyazaki099Kagoshima011 — Sapporo013 — Hakodate014 — Tomakomai016 — Asahikawa015 — Obihiro, Kushiro012 — Chitose011Sapporo013Hakodate014Tomakomai016Asahikawa015Obihiro, Kushiro012Chitose100 kmHokkaido, 01099 — Kagoshima098 — Naha, Miyazaki099Kagoshima098200 kmAmami and the Ryūkyū islands, from Kagoshima's 0997 to Okinawa's 098

How to read the map. Each patch is every code that begins with the same three digits, and the numeral on it is those digits — 011 is Sapporo and its plain, 052 Nagoya, 092 Fukuoka. The city under the numeral is the one the group is known for. The colour is the first digit, the coarsest cut the plan makes: 01 is Hokkaido, 02 runs from Aomori down through Niigata and Nagano to the north of Kantō, 03 is Tokyo, 04 the rest of Kantō, 05 Tōkai, 06 Osaka, 07 Kansai and the Hokuriku coast, 08 Chūgoku and Shikoku, 09 Kyūshū and Okinawa. Three groups are a single city's own code — 03, 06 and 052 — and sit on the map as a patch each. Click a patch for its codes; a code's panel entry names the municipalities it serves.

Where the lines come from. The regulator publishes no boundaries, only a list of its 582 numbering areas, each a code and the municipalities it serves written out in prose, with parentheses for the districts of a town that dial a different code. The patches are those municipalities, from the Ministry of Land's boundaries, each drawn in the code the list gives it whole. Where a list names a district (郡) without its towns, every town in it not placed elsewhere follows. Eighteen municipalities appear only by their parts — the six wards of Niigata that split between 025 and 0256, Fukuyama between 084 and 0847, Tsushima between 0920 and its own 09208 — and are drawn in the first code the list gives their parts, because a municipality is the smallest thing the boundaries have.

The edges. Three numbering areas dial the two-digit 04 and are told apart only by the first digits of the local number, so they are written 04-29 for Tokorozawa, 04-70 for Kamogawa and 04-71 for Kashiwa, and drawn in the groups those numbers put them in. Ogasawara, a thousand kilometres south of Tokyo on 04998, is outside both frames and in the panel only. The six villages of the Northern Territories are in the census boundaries and in no numbering plan, and are not drawn. Names are romanised from their kana readings in Hepburn, with macrons, except the handful English writes without them — Tokyo, Osaka, Kyoto, Kobe. The list is the regulator's edition of 1 March 2026.

Sources. Code list: Ministry of Internal Affairs and Communications (総務省), 市外局番の一覧 — the area-code list by numbering area, naming the municipalities each serves. Geometry: Ministry of Land, Infrastructure, Transport and Tourism, 国土数値情報 administrative boundaries (N03), 2021 edition, simplified and converted to GeoJSON by SmartNews Media Research Institute; dissolved by code group, by region and by prefecture. Readings: Geolonia, 住所データ — the kana reading of every municipality, from which the Hepburn spellings are made. Principal cities: Wikipedia, Telephone numbers in Japan, for which city each group is known by.