A Japanese address form is easier to complete if you separate its postal code, prefecture, municipality, town and block, then building and room before entering anything. The exact boxes vary between sites. Read what a field has already selected for you before adding the remaining address.
The example below is for learning the format. Use the address supplied by the recipient or accommodation for an actual delivery.
Start with the address you have
Practice example; do not use it for mail. Japan Post associates 160-0022 with 東京都新宿区新宿 in its postal-code lookup. The subsequent numbers, building name and room in this example were invented for this guide; their deliverability has not been checked.
〒160-0022
東京都新宿区新宿3丁目12番8号
サンプルハイツ405号室
For a Japanese-language form with separate boxes, use this map:
| Field on the form | Value in the example | What it means |
|---|---|---|
郵便番号 | 160-0022 | Seven-digit postal code; omit the 〒 mark from a numeric field |
都道府県 | 東京都 | Prefecture-level area, here Tokyo |
市区町村 | 新宿区 | Municipality or ward, here Shinjuku Ward |
町名・丁目 | 新宿3丁目 | Town name and numbered subdivision |
番地・号 | 12番8号 | Remaining block and residence numbers in this example |
建物名・部屋番号 | サンプルハイツ405号室 | Example building and room |
Some forms combine the town and numbers in one 住所1 or 町名・番地 field. In that case, keep 新宿3丁目12番8号 together. If the form has already selected 新宿3丁目, enter only the remaining 12番8号 in the next box. A second address line is not a second destination; it is usually where the building and room details go when the form provides that field.
Why 3-12-8 is not an apartment number
In this residential-address notation example, 3丁目 belongs to the town name, 12番 identifies the block, and 8号 is the residence number. The apartment room is the separate 405号室. The Shinjuku City explanation of residential address notation describes the town, block and residence-number levels.
A form may ask for the number portion as 3-12-8; keep its order. Do not move the final 8 into the room field or use 405 as a substitute for it.
Not every Japanese address has a chōme or three numbered parts. Some use a land-lot number written 番地. Japan’s Legal Affairs Bureau distinguishes land-lot numbers from residential address numbers. Preserve the actual wording of the address you were given rather than inventing a missing number to fit this example.
What a postal-code lookup does and does not fill
Japanese postal codes contain seven digits and are often displayed as 123-4567. Japan Post’s data notes describe codes assigned to town areas, including cases where one code covers several town areas or one area has multiple codes. A matching postal code does not identify a particular building or room.
After an auto-fill, compare the selected prefecture, municipality and town with the source address. Then add any remaining chōme, number, building name and room. If they do not match, recheck the postal code or ask the address provider. Changing a code merely to make a form accept the entry can create a different address.
Follow the form’s instruction on the hyphen: it may accept 160-0022, request 1600022, or provide separate boxes for the first three and last four digits. Keep any leading zero if your own code has one.
Mapping the same address into an English form
First check whether the form allows Japanese characters. An English interface does not, by itself, require a Romanized address. If Latin letters are required, use the spelling supplied with the real address or check place names against Japan Post’s Romanized postal-code data.
For a form with separate Country, State/Prefecture and City/Ward fields, the practice example maps as follows:
| English field | Practice value |
|---|---|
| Country | Japan |
| State / Province / Prefecture | Tokyo, or the form’s equivalent choice |
| City / Ward | Shinjuku-ku |
| Address Line 1 | 3-12-8 Shinjuku |
| Address Line 2 | Sample Heights, Room 405 |
| Postal Code | 160-0022 |
Sample Heights is only a made-up English counterpart to the example building. For a real property, use its confirmed building name. Shinjuku-ku is the ward; Shinjuku is the town name. They belong to different levels even though they look alike.
If there is no Address Line 2, follow that form’s instructions for including the building and room on its available address line. If City or Prefecture has no separate field, retain those details elsewhere in the address. Japan Post’s international-mail label guide shows the address components in a Latin-alphabet mailing format; its printed row order is not a universal web-form rule.
Troubleshoot the entry before submitting
| Form problem | Check first |
|---|---|
| Postal code has the wrong length | Remove 〒 and stray spaces; check the site’s hyphen rule |
| Full-width or half-width characters required | Change the character form only for the fields that request it |
| Auto-fill stops at the town | Add the remaining numbers, building name and room yourself |
| Chōme appears twice | Check whether a dropdown already included it |
Only 3-12-8 remains | Find where the town name 新宿 was omitted |
| Room vanishes on the confirmation screen | Make sure the building and room field was saved |
For a form or localization test, the Japanese address generator can supply structured sample data. Keep any extra fictional building or room values labelled as test cases, and check that each field survives saving or export. Generated samples are for testing address formats; they do not establish a usable delivery address or a person’s identity.