Kochi高知県
Mihara 三原村
Data last updated:
Mihara, Kochi, Japan has a population of 1,272 (2025 national census). IPSS projections estimate 1,161 by 2030 and 721 by 2050 (a decrease of about 49.8% from 2020), with the share of residents aged 65+ rising from 47.0% in 2020 to 58.7%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
1,272
2030
(Projection)
1,161
▼ -19.2%
2040
(Projection)
930
▼ -35.3%
2050
(Projection)
721
▼ -49.8%
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.
Mihara 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 | 2,195 | ▲ +52.7% | Census |
| 1985 | 2,156 | ▲ +50.0% | Census |
| 1990 | 2,005 | ▲ +39.5% | Census |
| 1995 | 1,986 | ▲ +38.2% | Census |
| 2000 | 1,871 | ▲ +30.2% | Census |
| 2005 | 1,808 | ▲ +25.8% | Census |
| 2010 | 1,681 | ▲ +17.0% | Census |
| 2015 | 1,574 | ▲ +9.5% | Census |
| 2020 | 1,437 | — | Census |
| 2025 | 1,272 | ▼ -11.5% | Census |
| 2030 | 1,161 | ▼ -19.2% | Projection |
| 2035 | 1,043 | ▼ -27.4% | Projection |
| 2040 | 930 | ▼ -35.3% | Projection |
| 2045 | 825 | ▼ -42.6% | Projection |
| 2050 | 721 | ▼ -49.8% | Projection |
About Mihara
Overview
Mihara (三原村) is a municipality in Kochi, Japan, with a population of 1,272 as of 2025.
Population Projection of Mihara
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Mihara's population is expected to reach 1,161 by 2030 (-19.2%), 930 by 2040 (-35.3%), and 721 by 2050 (-49.8%). A significant population decline is projected over the next three decades.
Aging Rate of Mihara
The aging rate (percentage of residents aged 65 and over) is 47.0% as of 2020 and is projected to rise to 58.7% by 2050. More than half of residents will be seniors, placing the town in the "marginal municipality" category.
National Comparison
Mihara is experiencing one of the faster rates of population decline in Japan.
National and Prefectural Rank
- Population decline rate: Ranked #352 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #152 out of 1903 nationwide.
- Population size: Ranked #1852 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