Kochi高知県
Ootsuki 大月町
Data last updated:
Ootsuki, Kochi, Japan has a population of 3,894 (2025 national census). IPSS projections estimate 3,406 by 2030 and 1,807 by 2050 (a decrease of about 59.2% from 2020), with the share of residents aged 65+ rising from 49.1% in 2020 to 62.6%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
3,894
2030
(Projection)
3,406
▼ -23.2%
2040
(Projection)
2,537
▼ -42.8%
2050
(Projection)
1,807
▼ -59.2%
Change vs. 2020 census
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Other municipalities in Kochi (高知県)
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.
Ootsuki 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 | 8,865 | ▲ +99.9% | Census |
| 1985 | 8,596 | ▲ +93.9% | Census |
| 1990 | 7,941 | ▲ +79.1% | Census |
| 1995 | 7,422 | ▲ +67.4% | Census |
| 2000 | 6,956 | ▲ +56.9% | Census |
| 2005 | 6,437 | ▲ +45.2% | Census |
| 2010 | 5,783 | ▲ +30.4% | Census |
| 2015 | 5,095 | ▲ +14.9% | Census |
| 2020 | 4,434 | — | Census |
| 2025 | 3,894 | ▼ -12.2% | Census |
| 2030 | 3,406 | ▼ -23.2% | Projection |
| 2035 | 2,957 | ▼ -33.3% | Projection |
| 2040 | 2,537 | ▼ -42.8% | Projection |
| 2045 | 2,155 | ▼ -51.4% | Projection |
| 2050 | 1,807 | ▼ -59.2% | Projection |
About Ootsuki
Overview
Ootsuki (大月町) is a municipality in Kochi, Japan, with a population of 3,894 as of 2025.
Population Projection of Ootsuki
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Ootsuki's population is expected to reach 3,406 by 2030 (-23.2%), 2,537 by 2040 (-42.8%), and 1,807 by 2050 (-59.2%). The town is projected to lose more than half its population over 30 years.
Aging Rate of Ootsuki
The aging rate (percentage of residents aged 65 and over) is 49.1% as of 2020 and is projected to rise to 62.6% by 2050. More than half of residents will be seniors, placing the town in the "marginal municipality" category.
National Comparison
Ootsuki is experiencing one of the faster rates of population decline in Japan.
National and Prefectural Rank
- Population decline rate: Ranked #80 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #61 out of 1903 nationwide.
- Population size: Ranked #1665 out of 1917 nationwide.
- Related: National rankings / All municipalities in Kochi
Earnings in Kochi (高知県): Average salary in Kochi (高知県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure