Kaisei, Kanagawa
town in Ashigarakami district, Kanagawa prefecture, Japan
Kaisei (開成町, Kaisei-machi) is a town located in Kanagawa Prefecture, Japan. As of 1 April 2021, the town had an estimated population of 18,335 and a population density of 2800 persons per km2. The total area of the town is 6.56 square kilometres (2.53 sq mi). It is the smallest municipality in Kanagawa Prefecture in terms of area.
Geography
Kaisei is located on the eastern bank of the Sakawa River, in western Kanagawa Prefecture.
Surrounding municipalities
Kanagawa Prefecture
Matsuda
Minamiashigara
Odawara
Ōi
Yamakita
Climate
Kaisei has a humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Kaisei is 13.6 °C. The average annual rainfall is 2221 mm with September as the wettest month. The temperatures are highest on average in August, at around 24.4 °C, and lowest in January, at around 3.2 °C.
Demographics
Per Japanese census data, the population of Kaisei has grown steadily since the 1970s.
History
The area of modern Kaisei was part of Odawara Domain in Sagami Province during the Edo period. After the Meiji Restoration, the area became part of Ashigarakami District in Kanagawa Prefecture and was divided into several villages with the establishment of the modern municipalities system on April 1, 1889.
“Kaisei, Kanagawa” enters the record as town in Ashigarakami district, Kanagawa prefecture, Japan. Crown Archives preserves that source wording while asking what Kaisei, Kanagawa and town can confirm, complicate or overturn.
Why this record matters
“Kaisei, Kanagawa” is worth following because a concise public description often conceals a longer documentary argument. Here, Kaisei, Kanagawa and town provides the most credible route into that argument.
Maps, plans, fabric surveys and administrative records can establish how the site’s name, extent and function changed over time. The source revision retrieved here is dated Sep 17, 2026. The linked authority identifier is Q1202613. VIAF identifies the subject as 251140495. Authority coordinates are 35.336, 139.123. 2 of 4 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank. The first chronological checks are 2021 and 1889.
Modern boundaries and familiar names can conceal earlier jurisdictions or structures that do not align with the present site. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “Kaisei, Kanagawa”, its source revision and the description used here.
- Expand the search: follow Kaisei, Kanagawa primary sources, Kaisei, Kanagawa archive and Kaisei research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Kaisei, Kanagawa”?
- Which authority defined the place, boundary or structure at the relevant date?
- Which earlier names or jurisdictions may reveal additional records?
Search terms from this dossier
This entry incorporates text from “Kaisei, Kanagawa” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.