Kochi高知県
Ookawa 大川村
Data last updated:
Ookawa, Kochi, Japan has a population of 336 (2025 national census). IPSS projections estimate 270 by 2030 and 174 by 2050 (a decrease of about 52.5% from 2020), with the share of residents aged 65+ rising from 41.0% in 2020 to 39.7%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
336
2030
(Projection)
270
▼ -26.2%
2040
(Projection)
213
▼ -41.8%
2050
(Projection)
174
▼ -52.5%
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.
Ookawa 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 | 906 | ▲ +147.5% | Census |
| 1985 | 751 | ▲ +105.2% | Census |
| 1990 | 758 | ▲ +107.1% | Census |
| 1995 | 680 | ▲ +85.8% | Census |
| 2000 | 569 | ▲ +55.5% | Census |
| 2005 | 538 | ▲ +47.0% | Census |
| 2010 | 411 | ▲ +12.3% | Census |
| 2015 | 396 | ▲ +8.2% | Census |
| 2020 | 366 | — | Census |
| 2025 | 336 | ▼ -8.2% | Census |
| 2030 | 270 | ▼ -26.2% | Projection |
| 2035 | 239 | ▼ -34.7% | Projection |
| 2040 | 213 | ▼ -41.8% | Projection |
| 2045 | 193 | ▼ -47.3% | Projection |
| 2050 | 174 | ▼ -52.5% | Projection |
About Ookawa
Overview
Ookawa (大川村) is a municipality in Kochi, Japan, with a population of 336 as of 2025.
Population Projection of Ookawa
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Ookawa's population is expected to reach 270 by 2030 (-26.2%), 213 by 2040 (-41.8%), and 174 by 2050 (-52.5%). The town is projected to lose more than half its population over 30 years.
Aging Rate of Ookawa
The aging rate (percentage of residents aged 65 and over) is 41.0% as of 2020 and is projected to rise to 39.7% by 2050. The aging rate will remain below the most severe Japanese averages.
National Comparison
Ookawa is experiencing one of the faster rates of population decline in Japan.
National and Prefectural Rank
- Population decline rate: Ranked #249 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #1292 out of 1903 nationwide.
- Population size: Ranked #1910 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