Kumamoto熊本県
Oozu 大津町
Data last updated:
Oozu, Kumamoto, Japan has a population of 36,915 (2025 national census). IPSS projections estimate 36,841 by 2030 and 36,639 by 2050 (an increase of about 4.1% from 2020), with the share of residents aged 65+ rising from 21.8% in 2020 to 30.7%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
36,915
2030
(Projection)
36,841
▲ +4.7%
2040
(Projection)
37,324
▲ +6.1%
2050
(Projection)
36,639
▲ +4.1%
Change vs. 2020 census
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Other municipalities in Kumamoto (熊本県)
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.
Oozu 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 | 19,894 | ▼ -43.5% | Census |
| 1985 | 22,008 | ▼ -37.5% | Census |
| 1990 | 23,744 | ▼ -32.5% | Census |
| 1995 | 26,376 | ▼ -25.0% | Census |
| 2000 | 28,021 | ▼ -20.4% | Census |
| 2005 | 29,107 | ▼ -17.3% | Census |
| 2010 | 31,234 | ▼ -11.2% | Census |
| 2015 | 33,452 | ▼ -4.9% | Census |
| 2020 | 35,187 | — | Census |
| 2025 | 36,915 | ▲ +4.9% | Census |
| 2030 | 36,841 | ▲ +4.7% | Projection |
| 2035 | 37,219 | ▲ +5.8% | Projection |
| 2040 | 37,324 | ▲ +6.1% | Projection |
| 2045 | 37,126 | ▲ +5.5% | Projection |
| 2050 | 36,639 | ▲ +4.1% | Projection |
About Oozu
Overview
Oozu (大津町) is a municipality in Kumamoto, Japan, with a population of 36,915 as of 2025.
Population Projection of Oozu
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Oozu's population is expected to reach 36,841 by 2030 (+4.7%), 37,324 by 2040 (+6.1%), and 36,639 by 2050 (+4.1%). Oozu is among the rare Japanese municipalities projected to see population growth.
Aging Rate of Oozu
The aging rate (percentage of residents aged 65 and over) is 21.8% as of 2020 and is projected to rise to 30.7% by 2050. The aging rate will remain below the most severe Japanese averages.
National Comparison
Oozu's demographic trajectory is similar to the national average.
National and Prefectural Rank
- Population decline rate: Ranked #1846 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #1816 out of 1903 nationwide.
- Population size: Ranked #815 out of 1917 nationwide.
- Related: National rankings / All municipalities in Kumamoto
Earnings in Kumamoto (熊本県): Average salary in Kumamoto (熊本県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure