Ōguchi
town in Niwa District, Aichi Prefecture, Japan
Ōguchi (大口町, Ōguchi-chō) is a town located in Niwa District, Aichi Prefecture, Japan. As of 1 October 2019, the town had an estimated population of 24,160 in 9547 households, and a population density of 1,775 persons per km2. The total area of the town was 13.61 square kilometres (5.25 sq mi).
Geography
Ōguchi is located in the extreme northeast corner of Aichi Prefecture, in the middle of the Nōbi Plain. The Gojō River flows through the town.
Neighboring municipalities
Aichi Prefecture
Fusō
Inuyama
Komaki
Kōnan
Demographics
Per Japanese census data, the population of Ōguchi has increased steadily over the past 50 years.
Climate
The town has a climate characterized by hot and humid summers, and relatively mild winters (Köppen climate classification Cfa). The average annual temperature in Ōguchi is 15.6 °C. The average annual rainfall is 1819 mm with September as the wettest month. The temperatures are highest on average in August, at around 28.0 °C, and lowest in January, at around 4.1 °C.
History
The villages of Kashiwamori, Ōta, Ōguchi and Tominari were created within Niwa District, Aichi with the establishment of the modern municipalities system in 1889. On October 1, 1906 Ōta, Ōguchi and Tominari and a portion of Kashiwamori merged to form the village of Ōguchi.
Begin with the source’s own compact description: “Ōguchi” is town in Niwa District, Aichi Prefecture, Japan. The dossier treats that line as a proposition to test through Ōguchi, town and Niwa, not as a finished interpretation.
Why this record matters
The phrase “town in Niwa District, Aichi Prefecture, Japan” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
The strongest evidence will usually combine a dated visual record with documents produced by the authority responsible for the place. The source revision retrieved here is dated Sep 17, 2026. The linked authority identifier is Q1203960. VIAF identifies the subject as 256561294. Authority coordinates are 35.333, 136.908. 2 of 4 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank. The first chronological checks are 2019, 1819, 1889 and 1906.
Architectural summaries often privilege surviving fabric and can understate demolished phases, contested use or displaced communities. 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 “Ōguchi”, its source revision and the description used here.
- Expand the search: follow Ōguchi primary sources, Ōguchi archive and Ōguchi 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 “Ōguchi”?
- Which earlier names or jurisdictions may reveal additional records?
- Which authority defined the place, boundary or structure at the relevant date?
Search terms from this dossier
This entry incorporates text from “Ōguchi” 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.