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Base registry for address

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Base registry for address is a database of addresses and locations developed as a base registry *.

*The official legal name of the base registry is defined as "Public Basic Information Database."

Notice

  • August 22, 2025
    • Base registry for address (Data Download Site) is currently under maintenance and cannot be used. We will notify you on this page after it resumes. Registry Catalog (Data Download) is available.
  • August 13, 2025
    • The date of base registry for address, which had been provided in the registry catalog, will be provided in Base registry for address (Download Site) (data download site) from August 13, 2025 (2025). The data provision in the registry catalog will end on September 16, 2025.
  • June 30, 2025
    • On June 1, 2025, the official version of the Machiaza data was released.

Table of

Background of the efforts

Address and location information is used in many public and private ledgers, such as the addresses of individuals and the locations of corporations and public facilities. Address and location information has the structure shown in Figure 1. Currently, there is a structural problem in that the systems related to address and location are divided into two different systems, the Real Estate Registration Act and the Residence Indication Act, and they are not centrally managed by the government. Therefore, various entities, mainly in private sector, are individually maintaining address and location information, and the following problems are arising.

  1. Duplication of costs across society
    For the same address and location information, multiple entities are conducting similar development and renewal, resulting in duplicate costs.
  2. Burden of information collection and provision
    Because each entity individually collects information from administrative agencies, there are opinions that not only the collecting side but also the providing side administrative agencies feel a burden.
  3. Lack of data compatibility
    In addition to the difficulty of linking residential signs and lot numbers, as a result of each entity developing individually, notation shaking is likely to occur, making data linkage and integration between systems difficult.
Figure 1
Figure 1: Illustration of Addresses with and without Residence Indication.

Overview of Activities

Since fiscal 2021, we have been using address / location-related data * held by the government and posting it as CSV data and disclosing it as a trial disclosure version.

*Digital Japan Basic Map (geographical name information) (Geospatial Information Authority of Japan), Locational Reference Information (Ministry of Land, Infrastructure, Transport and Tourism), Map provided by Registry Office (Ministry of Justice)

Starting in fiscal 2023, the Provisional Digital Administration Study Group and other bodies examined how the database should be developed and compiled a set of development policies for the database. Based on these policies, in June 2025, TMG announced the release of accurate municipal database with the confirmation of local governments. From then on, in cooperation with Ministry of Internal Affairs and Communications and other related ministries and agencies, TMG will continue to collect and provide updated information from local governments as needed to keep the database up-to-date. (For details, please refer to 's "Public Basic Information Database Development and Improvement Plan," , which was approved by the Cabinet on June 13, 2025.)

* "Machi-aza" refers to "machi or aza" in the Local Autonomy Act.

In addition, it is stipulated that "the code value of the Machi-aza IDs specified in the base registry for address" Machi-aza Master Data Set "developed by " shall be set in the data item "Address _ Machi-aza Code" of each system in , which is the standard specifications of the unified and standardized data requirements and linkage requirements for the core business systems of local governments in Digital Agency. base registry for address

The base registry for address table has a hierarchical structure as shown in Fig. 2.

The development policy for Machi-aza (map information) and lot number / residential indication (text information / map information) is currently being examined at the Expert Meeting for Promotion of Base / Registry. Please note that the data currently released for these is a trial release version.

Please use the date from the "base registry for address (date download site)" .

Figure 2
The data table for base registry for address consists of a hierarchical structure (from top to bottom: prefecture, municipality, town name, residential indication / block, residential indication / residence, and lot number). At present, data development has been completed up to prefecture, municipality, and town name (character information), so it is surrounded by a blue frame. Residential indication / block, residential indication / residence, and lot number are surrounded by gray frames due to incomplete development.

Future Development

The Expert Committee for the Promotion of Base Registry is studying policies for the development of town names (map information) and lot numbers and residential indications (character information and map information). For details, please refer to the Base Registry page.

Efforts to Promote the Use of base registry for address

In addition to publishing the town data collected in base registry for address in CSV format, ABR Geocoder (ABR stands for base registry for address), a tool for normalizing addresses and geocoding (assigning location coordinates), is also available as open source software at in in .

By using the ABR Geocoder, you can reduce the effort of matching and collating addresses and locations, and display addresses and locations with text strings on a digital map. For more information, please visit the ABR Geocoder explanation page .

Notes on Machi-Aza Data

There are some precautions to be taken when using the municipally confirmed "Machi-aza date" that has been released as an official version. Details are posted in the notice of base registry for address (date download site), so please check them.

Historical information