localgovjp

日本語のREADMEはこちらです: README.ja.md

An open dataset of all local governments in Japan, including prefectures, cities, wards, towns, and villages.

Sample Applications

• List of Prefecture and Municipality Websites in Japan
• Map of Government Offices in Japan
• Japanese Local Government Web Safety Rate
• Number of Cities in Japan
• Map of Prefectures in Japan
• Japanese Local Government AOSSL Dashboard
• Japanese Local Government Domain Census
• Japanese Local Government Trusted Primary Information Rate

Available Data

The data is available in both CSV and JSON formats, hosted via GitHub Pages for easy use in web applications.

Municipalities (Cities, Wards, Towns, Villages)

• CSV: https://code4fukui.github.io/localgovjp/localgovjp-utf8.csv
• JSON: https://code4fukui.github.io/localgovjp/localgovjp.json

Prefectures

• CSV: https://code4fukui.github.io/localgovjp/prefjp-utf8.csv
• JSON: https://code4fukui.github.io/localgovjp/prefjp.json

Data Schema

Municipalities (localgovjp)

Field	Description
pid	Prefecture ID
pref	Prefecture Name
cid	City ID
city	City Name
citykana	City Name (Kana)
lat	Latitude
lng	Longitude
url	City Website URL
phrase	Catchphrase
lgcode	Local Government Code

Prefectures (prefjp)

Field	Description
pid	Prefecture ID
pref	Prefecture Name
prefkana	Prefecture Name (Kana)
pref_en	Prefecture Name (English)
url	Prefecture Website URL
lgcode	Local Government Code
ISO3166-2	ISO 3166-2 Code (e.g., JP-01)

How to Update Data

This project uses Deno for data processing and updates.

Municipalities (localgov)

1. Generate an intermediate file for review: cd deno; deno -A chk-localgov.js
2. Manually check for errors and edit the generated deno/c-localgovjp-utf8.csv.
3. Generate the final data files (.csv, .json, .js): cd deno; deno -A make-localgov.js
4. Sign the data using OpendataWithTrust (requires PRIKEY in .env): cd deno; deno -A --env-file=.env sign-localgov.js

Prefectures (pref)

1. Generate an intermediate file for review by running the appropriate check script.
2. Manually check for errors and edit the generated deno/c-prefjp-utf8.csv.
3. Generate the final data files (.csv, .json, .js) by adapting deno/make.js.
4. Sign the data using OpendataWithTrust (requires PRIKEY in .env): cd deno; deno run -A --env-file=.env sign-pref.js

How to Verify Data

You can verify the integrity of the data files using OpendataWithTrust.

deno run --allow-read --allow-net https://code4fukui.github.io/opendata-with-trust/verifyTrust.js localgovjp-utf8.csv
deno run --allow-read --allow-net https://code4fukui.github.io/opendata-with-trust/verifyTrust.js localgovjp.json
deno run --allow-read --allow-net https://code4fukui.github.io/opendata-with-trust/verifyTrust.js prefjp-utf8.csv
deno run --allow-read --allow-net https://code4fukui.github.io/opendata-with-trust/verifyTrust.js prefjp.json

Data Sources

• Geospatial Information Authority of Japan
• Japan Agency for Local Authority Information Systems, National Municipality Map Search

Update

• 2016-11-29 Checked and updated all websites
• 2017-02-18 Removed duplicate entry for Tomari Village
• 2019-01-01 Updated
• 2020-01-04 Updated
• 2020-04-17 Updated
• 2021-01-20 Updated
• 2021-06-02 Changed Nakagawa Town, Fukuoka Prefecture to Nakagawa City, Fukuoka Prefecture
• 2021-06-30 Fixed incorrect location information for the Kihoku Town Office, Kitamuro District, Mie Prefecture
• 2021-07-19 Fixed the location of Etajima City, Hiroshima Prefecture
• 2021-10-31 Updated prefecture URLs and added ISO 3166-2
• 2021-11-01 Updated municipality URLs and added local government codes (lgcode)
• 2023-03-09 Updated municipality URLs
• 2026-01-01 Updated municipality URLs
• 2026-03-09 Updated municipality URLs
• 2026-07-09 Updated municipality URLs

License

• CC0