Postal-place testing - limited source coverage
Japan Address Generator
Japan-format test addresses retaining the source prefecture, municipality or district, and postal locality separately. A synthetic block/building line is added to a seven-digit postcode without inventing a Western street name.
GeoNames postal-place sample with a synthetic street. Limited source coverage; not delivery-verified.
Japan Address Format
The generated layout is a romanized, small-to-large testing representation: synthetic block/building line, postal locality, source municipality or district and prefecture, then NNN-NNNN postcode. Japanese domestic writing can use the reverse order. The tool does not claim that romanized source labels are authoritative Japanese-script address strings.
250-250-250 TEST BUILDING Togo Cho Aichi Gun, Aichi Ken 470-0100 JAPAN
Synthetic format example, not a delivery address. The street or box line is generated test data.
UPU Japan addressing reference. This reference documents postal layouts, not the validity of generated addresses.
Japan Source Coverage
- Retained source rows
- 146,442
- Locality labels by area
- 1,188
- Covered source groups
- 47
The three generated number groups are fictional test components, not verified chome, block or building identifiers. GeoNames second-level labels can describe a city or a gun district, so the tool does not call every such label a municipality. Postal localities are retained separately; malformed source labels beginning with an operator are excluded. Organization-specific codes and historical labels may appear in the source, and no residential deliverability claim is made.
Included prefecture groups
- Aichi Ken: 9,241 source rows
- Akita Ken: 2,303 source rows
- Aomori Ken: 2,732 source rows
- Chiba Ken: 4,225 source rows
- Ehime Ken: 2,044 source rows
- Fukui Ken: 2,545 source rows
- Fukuoka Ken: 4,143 source rows
- Fukushima Ken: 4,280 source rows
- Gifu Ken: 3,795 source rows
- Gumma Ken: 1,781 source rows
- Hiroshima Ken: 2,657 source rows
- Hokkaido: 9,425 source rows
- Hyogo Ken: 5,667 source rows
- Ibaraki Ken: 3,156 source rows
- Ishikawa Ken: 3,001 source rows
- Iwate Ken: 2,264 source rows
- Kagawa Ken: 967 source rows
- Kagoshima Ken: 1,706 source rows
- Kanagawa Ken: 3,109 source rows
- Kochi Ken: 1,842 source rows
- Kumamoto Ken: 2,153 source rows
- Kyoto Fu: 6,713 source rows
- Mie Ken: 2,787 source rows
- Miyagi Ken: 3,815 source rows
- Miyazaki Ken: 1,043 source rows
- Nagano Ken: 2,274 source rows
- Nagasaki Ken: 2,110 source rows
- Nara Ken: 2,097 source rows
- Niigata Ken: 6,013 source rows
- Oita Ken: 2,004 source rows
- Okayama Ken: 2,573 source rows
- Okinawa Ken: 1,049 source rows
- Osaka Fu: 4,716 source rows
- Saga Ken: 990 source rows
- Saitama Ken: 3,654 source rows
- Shiga Ken: 2,037 source rows
- Shimane Ken: 1,330 source rows
- Shizuoka Ken: 3,702 source rows
- Tochigi Ken: 2,060 source rows
- Tokushima Ken: 1,605 source rows
- Tokyo To: 8,751 source rows
- Tottori Ken: 1,491 source rows
- Toyama Ken: 3,607 source rows
- Wakayama Ken: 1,737 source rows
- Yamagata Ken: 2,103 source rows
- Yamaguchi Ken: 2,049 source rows
- Yamanashi Ken: 1,096 source rows
Counts describe this imported subset, not a national completeness percentage. A locality label may occur in more than one source group. Exact duplicates are removed; unsupported or inconsistent records are omitted, not repaired with guessed geography.
Japan Form-Testing Cases
Japan-facing applications often need separate prefecture, municipality, town and building fields. These fixtures test that hierarchy and the postcode hyphen. They do not replace Japanese-script test cases or prove that an address parser correctly handles every domestic convention. A US-style street-name requirement should not be imposed on all Japanese records.
Generated records are for development, QA and demonstrations. They must not be used for mail delivery, identity checks, account verification or proof of residence. A synthetic result can coincidentally resemble an existing address; it is not guaranteed to be nonexistent.
Data and Attribution
Geographic data: GeoNames JP postal export, reused under CC BY 4.0. Downloaded 2026-09-05. The source provides no guarantee of accuracy, timeliness or completeness.
Postal-place relationships are retained from individual source rows, without mixing localities and codes independently. Coordinates, population figures and unrelated gazetteer fields are not included in the browser data.
Japan Address FAQ
Are the three number groups real Japanese block identifiers?
No. They are synthetic values for a block/building-shaped test line. The source supports the postal locality and postcode relationship, not those building-level numbers.