Yamanashi山梨県
Kosuge 小菅村
Data last updated:
Kosuge, Yamanashi, Japan has a population of 603 (2025 national census). IPSS projections estimate 506 by 2030 and 328 by 2050 (a decrease of about 52.0% from 2020), with the share of residents aged 65+ rising from 45.3% in 2020 to 41.5%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
603
2030
(Projection)
506
▼ -26.0%
2040
(Projection)
401
▼ -41.4%
2050
(Projection)
328
▼ -52.0%
Change vs. 2020 census
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Other municipalities in Yamanashi (山梨県)
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.
Kosuge 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 | 1,284 | ▲ +87.7% | Census |
| 1985 | 1,227 | ▲ +79.4% | Census |
| 1990 | 1,177 | ▲ +72.1% | Census |
| 1995 | 1,123 | ▲ +64.2% | Census |
| 2000 | 1,084 | ▲ +58.5% | Census |
| 2005 | 1,018 | ▲ +48.8% | Census |
| 2010 | 816 | ▲ +19.3% | Census |
| 2015 | 726 | ▲ +6.1% | Census |
| 2020 | 684 | — | Census |
| 2025 | 603 | ▼ -11.8% | Census |
| 2030 | 506 | ▼ -26.0% | Projection |
| 2035 | 449 | ▼ -34.4% | Projection |
| 2040 | 401 | ▼ -41.4% | Projection |
| 2045 | 362 | ▼ -47.1% | Projection |
| 2050 | 328 | ▼ -52.0% | Projection |
About Kosuge
Overview
Kosuge (小菅村) is a municipality in Yamanashi, Japan, with a population of 603 as of 2025.
Population Projection of Kosuge
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Kosuge's population is expected to reach 506 by 2030 (-26.0%), 401 by 2040 (-41.4%), and 328 by 2050 (-52.0%). The town is projected to lose more than half its population over 30 years.
Aging Rate of Kosuge
The aging rate (percentage of residents aged 65 and over) is 45.3% as of 2020 and is projected to rise to 41.5% by 2050. Over 40% of residents will be elderly, significantly affecting healthcare and social services needs.
National Comparison
Kosuge is experiencing one of the faster rates of population decline in Japan.
National and Prefectural Rank
- Population decline rate: Ranked #265 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #1134 out of 1903 nationwide.
- Population size: Ranked #1897 out of 1917 nationwide.
- Related: National rankings / All municipalities in Yamanashi
Earnings in Yamanashi (山梨県): Average salary in Yamanashi (山梨県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure