Postal Codes

312-0057 Postcode

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Postal code 312-0057 covers Ishikawacho, Ibaraki Ken. A Japanese postal code is seven digits, written with a hyphen after the third. The figures below describe the municipality this code falls in — Japan publishes by municipality, not by postal code.

Municipality
Hitachinaka
In Japanese
ひたちなか市
Residents
154,311
Population density
1,543.6 /km²
Prefecture
Ibaraki Ken

Where 312-0057 is

Hitachinaka, Ibaraki Ken — the point recorded for this postal code. It marks the centre of the code, not its boundary.

People
Residents154,311
Population density1,543.6 /km²
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Where this code is
MunicipalityHitachinaka
In Japaneseひたちなか市
PrefectureIbaraki Ken
Area99.97 km²

Population and area by municipality, from Wikidata under CC0, joined to postal codes through the dantai code. GeoNames romanises Japanese place names and Japan's own statistics are keyed in kanji, so the join is by name within a prefecture rather than by a shared identifier. Figures describe the whole municipality, not the postal code.

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