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

• Number of Cities in Japan
• List of Prefecture and City Websites in Japan
• Map of City Halls in Japan
• Map of Prefectures in Japan

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: deno run -A deno/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): deno run -A deno/make-localgov.js
4. Sign the data using OpendataWithTrust (requires PRIKEY in .env): deno run -A deno/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): deno run -A deno/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
• [Local Government