Akita秋田県
Kosaka 小坂町
Data last updated:
Kosaka, Akita, Japan has a population of 4,209 (2025 national census). IPSS projections estimate 3,694 by 2030 and 2,059 by 2050 (a decrease of about 56.9% from 2020), with the share of residents aged 65+ rising from 44.9% in 2020 to 58.8%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
4,209
2030
(Projection)
3,694
▼ -22.7%
2040
(Projection)
2,790
▼ -41.6%
2050
(Projection)
2,059
▼ -56.9%
Change vs. 2020 census
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Other municipalities in Akita (秋田県)
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.
Kosaka 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 | 10,526 | ▲ +120.2% | Census |
| 1985 | 9,728 | ▲ +103.5% | Census |
| 1990 | 8,035 | ▲ +68.1% | Census |
| 1995 | 7,703 | ▲ +61.2% | Census |
| 2000 | 7,171 | ▲ +50.0% | Census |
| 2005 | 6,824 | ▲ +42.8% | Census |
| 2010 | 6,054 | ▲ +26.7% | Census |
| 2015 | 5,339 | ▲ +11.7% | Census |
| 2020 | 4,780 | — | Census |
| 2025 | 4,209 | ▼ -11.9% | Census |
| 2030 | 3,694 | ▼ -22.7% | Projection |
| 2035 | 3,221 | ▼ -32.6% | Projection |
| 2040 | 2,790 | ▼ -41.6% | Projection |
| 2045 | 2,411 | ▼ -49.6% | Projection |
| 2050 | 2,059 | ▼ -56.9% | Projection |
About Kosaka
Overview
Kosaka (小坂町) is a municipality in Akita, Japan, with a population of 4,209 as of 2025.
Population Projection of Kosaka
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Kosaka's population is expected to reach 3,694 by 2030 (-22.7%), 2,790 by 2040 (-41.6%), and 2,059 by 2050 (-56.9%). The town is projected to lose more than half its population over 30 years.
Aging Rate of Kosaka
The aging rate (percentage of residents aged 65 and over) is 44.9% as of 2020 and is projected to rise to 58.8% by 2050. More than half of residents will be seniors, placing the town in the "marginal municipality" category.
National Comparison
Kosaka is experiencing one of the faster rates of population decline in Japan.
National and Prefectural Rank
- Population decline rate: Ranked #123 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #148 out of 1903 nationwide.
- Population size: Ranked #1644 out of 1917 nationwide.
- Related: National rankings / All municipalities in Akita
Earnings in Akita (秋田県): Average salary in Akita (秋田県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure