Kochi高知県
Tosashimizu 土佐清水市
Data last updated:
Tosashimizu, Kochi, Japan has a population of 10,378 (2025 national census). IPSS projections estimate 9,598 by 2030 and 5,124 by 2050 (a decrease of about 58.6% from 2020), with the share of residents aged 65+ rising from 50.5% in 2020 to 62.9%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
10,378
2030
(Projection)
9,598
▼ -22.5%
2040
(Projection)
7,138
▼ -42.4%
2050
(Projection)
5,124
▼ -58.6%
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.
Tosashimizu 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 | 24,252 | ▲ +95.8% | Census |
| 1985 | 23,014 | ▲ +85.8% | Census |
| 1990 | 21,182 | ▲ +71.0% | Census |
| 1995 | 19,582 | ▲ +58.1% | Census |
| 2000 | 18,512 | ▲ +49.4% | Census |
| 2005 | 17,281 | ▲ +39.5% | Census |
| 2010 | 16,029 | ▲ +29.4% | Census |
| 2015 | 13,778 | ▲ +11.2% | Census |
| 2020 | 12,388 | — | Census |
| 2025 | 10,378 | ▼ -16.2% | Census |
| 2030 | 9,598 | ▼ -22.5% | Projection |
| 2035 | 8,327 | ▼ -32.8% | Projection |
| 2040 | 7,138 | ▼ -42.4% | Projection |
| 2045 | 6,062 | ▼ -51.1% | Projection |
| 2050 | 5,124 | ▼ -58.6% | Projection |
About Tosashimizu
Overview
Tosashimizu (土佐清水市) is a municipality in Kochi, Japan, with a population of 10,378 as of 2025.
Population Projection of Tosashimizu
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Tosashimizu's population is expected to reach 9,598 by 2030 (-22.5%), 7,138 by 2040 (-42.4%), and 5,124 by 2050 (-58.6%). The town is projected to lose more than half its population over 30 years.
Aging Rate of Tosashimizu
The aging rate (percentage of residents aged 65 and over) is 50.5% as of 2020 and is projected to rise to 62.9% by 2050. More than half of residents will be seniors, placing the town in the "marginal municipality" category.
National Comparison
Tosashimizu is experiencing one of the faster rates of population decline in Japan.
National and Prefectural Rank
- Population decline rate: Ranked #87 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #58 out of 1903 nationwide.
- Population size: Ranked #1333 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