Japan Postal Code (KEN_ALL) Lookup API

Unofficial Japan Post postal code (KEN_ALL) lookup API. by_zipcode: a 7-digit code -> address (prefecture/city/town, kanji + kana + English prefecture). by_address: a prefecture/city -> its postal codes. Downloads the official KEN_ALL once and searches it in memory. Free of copyright per Japan Post.

Publisher description, verbatim

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Key figures5 readings

Price / 1k$1.00per 1,000 record

Users / 30d1↑ 1 over 5 readings

Users, all time2↑ 1 over 5 readings

Runs / 30d4↑ 3 over 4 readings

Runs / user / mo4.00runs per monthly user

Users / 30d5 readings

Recorded changes

showing 1 of 1 in the last 30 days · followers get the next one by email

2026-09-04changeListed—on record

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