Yamanashi山梨県
Koushuu 甲州市
Data last updated:
Koushuu, Yamanashi, Japan has a population of 26,955 (2025 national census). IPSS projections estimate 24,860 by 2030 and 16,846 by 2050 (a decrease of about 42.4% from 2020), with the share of residents aged 65+ rising from 36.7% in 2020 to 51.7%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
26,955
2030
(Projection)
24,860
▼ -15.0%
2040
(Projection)
20,735
▼ -29.1%
2050
(Projection)
16,846
▼ -42.4%
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.
Koushuu 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 | 37,269 | ▲ +27.5% | Census |
| 1985 | 37,338 | ▲ +27.7% | Census |
| 1990 | 37,038 | ▲ +26.7% | Census |
| 1995 | 38,046 | ▲ +30.1% | Census |
| 2000 | 36,925 | ▲ +26.3% | Census |
| 2005 | 35,922 | ▲ +22.9% | Census |
| 2010 | 33,927 | ▲ +16.0% | Census |
| 2015 | 31,671 | ▲ +8.3% | Census |
| 2020 | 29,237 | — | Census |
| 2025 | 26,955 | ▼ -7.8% | Census |
| 2030 | 24,860 | ▼ -15.0% | Projection |
| 2035 | 22,768 | ▼ -22.1% | Projection |
| 2040 | 20,735 | ▼ -29.1% | Projection |
| 2045 | 18,763 | ▼ -35.8% | Projection |
| 2050 | 16,846 | ▼ -42.4% | Projection |
About Koushuu
Overview
Koushuu (甲州市) is a municipality in Yamanashi, Japan, with a population of 26,955 as of 2025.
Population Projection of Koushuu
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Koushuu's population is expected to reach 24,860 by 2030 (-15.0%), 20,735 by 2040 (-29.1%), and 16,846 by 2050 (-42.4%). A significant population decline is projected over the next three decades.
Aging Rate of Koushuu
The aging rate (percentage of residents aged 65 and over) is 36.7% as of 2020 and is projected to rise to 51.7% by 2050. More than half of residents will be seniors, placing the town in the "marginal municipality" category.
National Comparison
Koushuu is experiencing one of the faster rates of population decline in Japan.
National and Prefectural Rank
- Population decline rate: Ranked #636 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #443 out of 1903 nationwide.
- Population size: Ranked #955 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