Aichi愛知県
Ooguchi 大口町
Data last updated:
Ooguchi, Aichi, Japan has a population of 23,524 (2025 national census). IPSS projections estimate 24,625 by 2030 and 23,366 by 2050 (a decrease of about 3.9% from 2020), with the share of residents aged 65+ rising from 24.6% in 2020 to 33.2%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025Census
23,524
2030Projection
24,625
▲ +1.3%
2040Projection
24,229
▼ -0.3%
2050Projection
23,366
▼ -3.9%
Change vs. 2020 census
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Other municipalities in Aichi (愛知県)
Data Sources
- Portal Site of Official Statistics of Japan (e-Stat)（https://www.e-stat.go.jp/）
- National Institute of Population and Social Security Research (IPSS), Regional Population Projections (2023 ed.)
* This service uses the e-Stat API but its content is not guaranteed by the Japanese government.
Ooguchi Population Table (1980–2050)
Population by year: national census results (restated to current municipal boundaries) and IPSS (2023) projections based on the 2020 census.
| Year | Population | vs 2020 | Type |
|---|---|---|---|
| 1980 | 16,195 | ▼ -33.4% | Census |
| 1985 | 17,247 | ▼ -29.0% | Census |
| 1990 | 17,464 | ▼ -28.1% | Census |
| 1995 | 19,031 | ▼ -21.7% | Census |
| 2000 | 20,633 | ▼ -15.1% | Census |
| 2005 | 21,602 | ▼ -11.1% | Census |
| 2010 | 22,446 | ▼ -7.6% | Census |
| 2015 | 23,274 | ▼ -4.2% | Census |
| 2020 | 24,305 | — | Census |
| 2025 | 23,524 | ▼ -3.2% | Census |
| 2030 | 24,625 | ▲ +1.3% | Projection |
| 2035 | 24,491 | ▲ +0.8% | Projection |
| 2040 | 24,229 | ▼ -0.3% | Projection |
| 2045 | 23,828 | ▼ -2.0% | Projection |
| 2050 | 23,366 | ▼ -3.9% | Projection |
About Ooguchi
Overview
Ooguchi (大口町) is a municipality in Aichi, Japan, with a population of 23,524 as of 2025.
Population Projection of Ooguchi
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Ooguchi's population is expected to reach 24,625 by 2030 (+1.3%), 24,229 by 2040 (-0.3%), and 23,366 by 2050 (-3.9%). A modest population change is expected.
Aging Rate of Ooguchi
The aging rate (percentage of residents aged 65 and over) is 24.6% as of 2020 and is projected to rise to 33.2% by 2050. The aging rate will remain below the most severe Japanese averages.
National Comparison
Ooguchi's demographic trajectory is similar to the national average.
National and Prefectural Rank
- Population decline rate: Ranked #1738 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #1720 out of 1903 nationwide.
- Population size: Ranked #1016 out of 1917 nationwide.
- Related: National rankings / All municipalities in Aichi
Earnings in Aichi (愛知県): Average salary in Aichi (愛知県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure