Cross-reference Japanese address and parcel identifiers

Japanese addresses written for navigation follow the 住居表示 (residential address) system, for example 中央区銀座一丁目2番3号. That address tells you where a building sits, but it is not the key that unlocks the property register. To cross-reference Japanese address and parcel identifiers, you must convert the 住居表示 into its corresponding 地番 (land lot number), the cadastral identifier that indexes the official land register (不動産登記簿). A single 住居表示 can cover one or more 地番 parcels, and a single 地番 can be split into multiple 住居表示 units. The steps below walk through that conversion, explain the difference between jukyo hyoji and chiban, and show how to verify a property address in the Japan registry.

Convert a Japanese address to a parcel number

Step 1: Identify the address format and the local authority

Open the consultancy report and locate the full address. Note the city, ward or town. If the report provides only a 地番, you can skip the conversion and go directly to Step 3. If it provides a 住居表示, proceed to Step 2.

Step 2: Query the local cross-reference map

Every local authority that has implemented the Act on Indication of Residential Addresses (住居表示に関する法律, Law No. 119 of 1962) maintains a 住居表示台帳 (residential address ledger) and a 町名地番対照図 (town-name-to-lot-number cross-reference map). These are held by the 住居表示担当課 (residential address section).

Visit the counter in person or, in many cities, request a copy by mail or through the local government website. The cross-reference map lists each 住居表示 and shows the corresponding 地番, for example 大字中村字西原1234番. Record the full 地番, including the district name and any branch number such as 123-1 or 123-2.

If the area has not yet implemented 住居表示, approximately 5% of rural areas still use 地番 directly as the address, per MLIT’s 2020 survey (source: MLIT, “住居表示の実施状況,” 2020). In that case the report’s address may already be a 地番, and you can proceed to Step 3.

Step 3: Verify the parcel number against the cadastral map

The Legal Affairs Bureau (法務局) maintains the official cadastral map (登記所備付地図) for each parcel. Access this map online through the 登記情報提供サービス, operated by the Civil Legal Affairs Association under Legal Affairs Bureau supervision. A fee is required per parcel.

Search by the 地番 you obtained. The cadastral map shows the parcel boundary, its area and adjacent parcels. Confirm that the shape and area match the description in the consultancy report. If the map shows a different shape or a different 地番 at that location, a discrepancy exists that you must resolve before proceeding.

Step 4: Confirm the parcel number matches the register entry

Using the same 地番, request a 登記事項証明書 (certificate of registered matters) for the parcel. The register has three sections: 表題部 (heading section, showing parcel area and location), 甲区 (rights section A, for ownership) and 乙区 (rights section B, for mortgages and other encumbrances). The 地番 in the heading section must exactly match the 地番 you verified in Step 3.

If the 住居表示 in the consultancy report was correct but the 地番 leads to a different ownership record, you have found a mismatch.

Understand the difference between jukyo hyoji and chiban

住居表示 (jukyo hyoji) is the address system designed for navigation, postal delivery and emergency response. It uses block numbers and building numbers that follow a logical street pattern. 地番 (chiban) is the land lot number assigned during the original cadastral survey, often centuries ago. The two systems operate independently. A 住居表示 block rarely aligns with a single 地番 parcel, and a 地番 parcel may contain several buildings each with their own 住居表示. The key operational difference is that the property register, the definitive legal record of ownership and encumbrances, is indexed solely by 地番. No matter how precise the 住居表示 appears, you cannot pull the register without first obtaining the 地番.

How to verify a property address in the Japan registry

Verifying a property address in the Japan registry requires checking three independent sources and confirming they agree. The three sources are the consultancy report, the local cross-reference map and the Legal Affairs Bureau register. Disagreement among them does not automatically mean the report is wrong. Use the decision rule below.

What a mismatch means

• 住居表示 renumbering: The local authority may have reorganised block numbers (街区再編) under the 1962 Act. The 地番 remains unchanged. Check the local gazette (市町村報) for the effective date of the change. If the report uses an old 住居表示, the 地番 is still valid.
• Land subdivision or consolidation: A 地番 may be split, for example 123 becoming 123-1 and 123-2, or merged. The 住居表示 may not be updated. The branch number at the end of the 地番 signals a subdivision. Cross-reference the 住居表示台帳 to see if the new 地番 corresponds to a different building.
• 住居表示 not implemented: The area may still use 地番 as the address. The consultancy report may have incorrectly applied a 住居表示 format. Treat the 地番 from the report as the primary identifier.
• Clerical error: The report may have transposed digits or used the wrong block number. Return to Step2 and verify the 住居表示 against the local cross-reference map for the correct 地番.

Only after checking these four possibilities should you conclude that the report refers to a different property.

Recognise boundary changes and renumbering indicators

Aboundary change, such as a road realignment, alters the cadastral map but does not always change the 地番. The most reliable indicator of a boundary change is a new cadastral survey record filed by a licensed land and building surveyor (土地家屋調査士) under the Real Property Registration Act (不動産登記法, Law No.123 of2004). The Legal Affairs Bureau updates the cadastral map when the survey is registered.

Are numbering of 住居表示 is announced in the local gazette. Search the gazette online or request a copy from the 住居表示担当課. The gazette lists the old and new 住居表示 for each affected property.

When to use ブルーマップ

Zenrin Co., Ltd. publishes ブルーマップ (blue maps) at scales of1:1,000 to1:1,500 for major urban areas. These maps overlay cadastral parcel boundaries with 地番 and building footprints. They are updated annually for major cities (source: Zenrin, “ブルーマップ 商品情報,” annual cycle).

ブルーマップ is a useful cross-reference tool, but it is not an official record. Use it to identify the approximate location of a 地番 and to see building footprints relative to parcel boundaries. If the ブルーマップ shows a different building on the parcel than the one described in the consultancy report, that is a strong signal to verify the 地番 against the official cadastral map.

Cross-reference Japanese address and parcel identifiers: final checklist

1. Confirm the consultancy report’s address format: 住居表示 or 地番.
2. If 住居表示, obtain the 地番 from the local 町名地番対照図.
3. Verify the 地番 on the cadastral map via 登記情報提供サービス.
4. Request the 登記事項証明書 for that 地番 from the Legal Affairs Bureau.
5. If the 地番 does not match the cadastral map or register, check for renumbering, subdivision, non-implementation or clerical error.
6. If the mismatch persists, consult the 住居表示担当課 for 住居表示 issues or the Legal Affairs Bureau for 地番 issues.
7. Use ブルーマップ only as a visual aid, not as a substitute for official records.

The land register is the definitive legal record. A consultancy report is a secondary source. Follow this sequence to cross-reference Japanese address and parcel identifiers correctly. The same method supports broader research into property and company records whenever a parcel number is the required lookup key.