Japanese Prefecture Codes: Complete List of All 47 Prefectures
Complete list of all 47 Japanese prefecture codes (ISO 3166-2:JP). Full table with codes organized by region, plus TypeScript examples for developers.
Japanese Prefecture Codes: Complete List of All 47 Prefectures
Japan is divided into 47 prefectures (todofuken), each with a standardized ISO 3166-2 code. These codes are used in address forms, shipping systems, e-commerce platforms, and any application that handles Japanese regional data.
This page lists every Japanese prefecture code organized by geographic region, and shows how to work with them using @koshmoney/countries.
All 47 Japanese Prefecture Codes
Japanese ISO 3166-2 codes use a numeric format (JP-01 through JP-47) rather than letter abbreviations. All entries have the type "Prefecture" in ISO 3166-2.
Hokkaido Region
| Code | Name | Japanese |
|---|---|---|
| JP-01 | Hokkaido | hokkaido |
Tohoku Region
| Code | Name | Japanese |
|---|---|---|
| JP-02 | Aomori | aomori |
| JP-03 | Iwate | iwate |
| JP-04 | Miyagi | miyagi |
| JP-05 | Akita | akita |
| JP-06 | Yamagata | yamagata |
| JP-07 | Fukushima | fukushima |
Kanto Region
| Code | Name | Japanese |
|---|---|---|
| JP-08 | Ibaraki | ibaraki |
| JP-09 | Tochigi | tochigi |
| JP-10 | Gunma | gunma |
| JP-11 | Saitama | saitama |
| JP-12 | Chiba | chiba |
| JP-13 | Tokyo | tokyo |
| JP-14 | Kanagawa | kanagawa |
Chubu Region
| Code | Name | Japanese |
|---|---|---|
| JP-15 | Niigata | niigata |
| JP-16 | Toyama | toyama |
| JP-17 | Ishikawa | ishikawa |
| JP-18 | Fukui | fukui |
| JP-19 | Yamanashi | yamanashi |
| JP-20 | Nagano | nagano |
| JP-21 | Gifu | gifu |
| JP-22 | Shizuoka | shizuoka |
| JP-23 | Aichi | aichi |
Kansai (Kinki) Region
| Code | Name | Japanese |
|---|---|---|
| JP-24 | Mie | mie |
| JP-25 | Shiga | shiga |
| JP-26 | Kyoto | kyoto |
| JP-27 | Osaka | osaka |
| JP-28 | Hyogo | hyogo |
| JP-29 | Nara | nara |
| JP-30 | Wakayama | wakayama |
Chugoku Region
| Code | Name | Japanese |
|---|---|---|
| JP-31 | Tottori | tottori |
| JP-32 | Shimane | shimane |
| JP-33 | Okayama | okayama |
| JP-34 | Hiroshima | hiroshima |
| JP-35 | Yamaguchi | yamaguchi |
Shikoku Region
| Code | Name | Japanese |
|---|---|---|
| JP-36 | Tokushima | tokushima |
| JP-37 | Kagawa | kagawa |
| JP-38 | Ehime | ehime |
| JP-39 | Kochi | kochi |
Kyushu and Okinawa Region
| Code | Name | Japanese |
|---|---|---|
| JP-40 | Fukuoka | fukuoka |
| JP-41 | Saga | saga |
| JP-42 | Nagasaki | nagasaki |
| JP-43 | Kumamoto | kumamoto |
| JP-44 | Oita | oita |
| JP-45 | Miyazaki | miyazaki |
| JP-46 | Kagoshima | kagoshima |
| JP-47 | Okinawa | okinawa |
Understanding Japanese Prefecture Codes
Unlike most countries that use letter-based subdivision codes, Japan uses a numeric system from 01 to 47. The numbering follows a geographic order from north (Hokkaido, 01) to south (Okinawa, 47).
| Component | Example | Meaning |
|---|---|---|
| Country prefix | JP | Japan |
| Separator | - | Standard delimiter |
| Prefecture number | 13 | Tokyo |
| Full code | JP-13 | Tokyo, Japan |
[!NOTE] In Japanese administrative terminology, prefectures are called by four different names depending on the specific prefecture: "to" (Tokyo-to), "do" (Hokkai-do), "fu" (Osaka-fu, Kyoto-fu), and "ken" (all other 43 prefectures). ISO 3166-2 uses the uniform type "Prefecture" for all 47.
Using Japanese Prefecture Codes in Code
Look Up a Prefecture
import { subdivision } from '@koshmoney/countries';
subdivision.whereCode('JP-13');
// { code: 'JP-13', name: 'Tokyo', type: 'Prefecture', countryCode: 'JP' }
subdivision.whereCode('JP-27');
// { code: 'JP-27', name: 'Osaka', type: 'Prefecture', countryCode: 'JP' }Get All Japanese Prefectures
import { subdivision } from '@koshmoney/countries';
const allJP = subdivision.forCountry('JP');
// Returns array of 47 prefectures
// Build a dropdown
const options = allJP.map(s => ({
label: s.name,
value: s.code,
}));Validate a Prefecture Code
import { subdivision } from '@koshmoney/countries';
subdivision.isValidCode('JP-13'); // true (Tokyo)
subdivision.isValidCode('JP-48'); // false (only 47 prefectures)
subdivision.isValidRegion('JP', '01'); // true (Hokkaido)
subdivision.isValidRegion('JP', '99'); // falseTree-Shaking for Japanese Data Only
import '@koshmoney/countries/subdivision/JP';
import { whereCode, forCountry } from '@koshmoney/countries/subdivision';
const tokyo = whereCode('JP-13');
const allPrefectures = forCountry('JP');Postal Code System
Japan uses a 7-digit postal code system with a hyphen after the first 3 digits (e.g. 100-0001). The first 3 digits indicate the region and roughly correspond to prefecture areas.
| First Digits | Region |
|---|---|
| 001-099 | Hokkaido |
| 100-209 | Tokyo |
| 210-259 | Kanagawa |
| 260-299 | Chiba |
| 300-399 | Ibaraki, Tochigi, Gunma, Saitama |
| 400-499 | Yamanashi, Nagano, Niigata |
| 500-599 | Gifu, Shizuoka, Aichi, Mie |
| 600-699 | Shiga, Kyoto, Osaka, Hyogo, Nara, Wakayama |
| 700-799 | Tottori, Shimane, Okayama, Hiroshima, Yamaguchi |
| 800-899 | Tokushima, Kagawa, Ehime, Kochi, Fukuoka, Saga, Nagasaki, Kumamoto, Oita |
| 900-999 | Miyazaki, Kagoshima, Okinawa |
import { postalCode } from '@koshmoney/countries';
postalCode.isValid('JP', '100-0001'); // true (Chiyoda, Tokyo)
postalCode.isValid('JP', '5300001'); // true (Osaka, no hyphen)
postalCode.isValid('JP', '12345'); // false (too few digits)Currency and Country Data
import { country } from '@koshmoney/countries';
import { currency } from '@koshmoney/countries/currency';
import { geography } from '@koshmoney/countries/geography';
country.whereAlpha2('JP');
// { name: 'Japan', alpha2: 'JP', alpha3: 'JPN', numeric: '392' }
currency.getCurrency('JP');
// { code: 'JPY', symbol: '\u00a5', name: 'Japanese Yen' }
geography.getContinent('JP'); // 'Asia'
geography.getRegion('JP'); // 'Eastern Asia'Common Use Cases
E-Commerce Address Forms
Japanese address forms typically list prefectures in the standard JIS order (01 to 47). The numeric ISO codes match this convention:
import { subdivision } from '@koshmoney/countries';
const prefectures = subdivision.forCountry('JP');
// Already in numeric order (JP-01 through JP-47)
const dropdown = prefectures.map(p => ({
label: p.name,
value: p.code,
}));Shipping Zone Calculation
Japanese logistics providers define zones based on distance from the shipping origin. Prefecture codes help determine the zone:
const tokyoMetro = new Set(['JP-13', 'JP-11', 'JP-12', 'JP-14']);
const kansaiMetro = new Set(['JP-26', 'JP-27', 'JP-28']);
function getShippingZone(from: string, to: string): string {
if (from === to) return 'same-prefecture';
if (tokyoMetro.has(from) && tokyoMetro.has(to)) return 'metro';
if (kansaiMetro.has(from) && kansaiMetro.has(to)) return 'metro';
return 'standard';
}Regional Content Targeting
Prefecture codes help serve region-specific content, promotions, or language variations:
function getRegion(prefectureCode: string): string {
const num = parseInt(prefectureCode.split('-')[1], 10);
if (num === 1) return 'hokkaido';
if (num <= 7) return 'tohoku';
if (num <= 14) return 'kanto';
if (num <= 23) return 'chubu';
if (num <= 30) return 'kansai';
if (num <= 35) return 'chugoku';
if (num <= 39) return 'shikoku';
return 'kyushu-okinawa';
}Related Resources
- Country Code Converter Tool -- look up JP and all other codes
- Asian Countries List -- all countries in Asia
- Indian State Codes -- similar guide for India
- Subdivision API Reference -- full subdivision API documentation