Open data Local government materials that have been worked on

Materials such as a list of local governments that have taken open data initiatives are posted.

Data Disclosure Methods under the Open Data Promotion Guidelines for Local Governments

This could be done by publishing it on a website operated by a local public entity (by opening an open-data site on part of an official site or on an independent site), by publishing it on a website operated by a government agency or a private organization, or by building a data-catalog site with a cross-sectoral search function.

If the data is published on a website other than the official website, it is necessary to indicate that the external website is used and the URL of the website where the data is published so that users can easily access the data.

Material

• List of Local Governments Using Open Data (as of October 31, 2025)
  • This is a list of prefectures and municipalities that have worked on open data.
    • Full (Excel/154KB) (updated December 5, 2025)
    • Prefecture (CSV/4KB) (updated December 5, 2025)
    • City (CSV/182KB) (updated December 5, 2025)

For local governments that were added or updated after the update as of March 11, 2019 (2019), the dates of addition or update are listed.

• Open Data Initiatives by Local Governments (PPTX / 307 kb) (as of October 31, 2025)
  • This is a document that summarizes the changes in the number of local governments working on open data and the status of efforts by prefecture and population size.
• List of Local Government Database Sites (Open Data Catalog Site)
  • This is a list of database sites where data is published by prefectures and municipalities that have already taken open data initiatives.
  • Updates as of October 31, 2025 are not reflected. Updates will be made when ready.