Yamanashi山梨県
Ootsuki 大月市
Data last updated:
Ootsuki, Yamanashi, Japan has a population of 20,034 (2025 national census). IPSS projections estimate 17,746 by 2030 and 9,672 by 2050 (a decrease of about 57.0% from 2020), with the share of residents aged 65+ rising from 40.7% in 2020 to 59.9%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
20,034
2030
(Projection)
17,746
▼ -21.2%
2040
(Projection)
13,423
▼ -40.4%
2050
(Projection)
9,672
▼ -57.0%
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.
Ootsuki 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 | 35,404 | ▲ +57.3% | Census |
| 1985 | 34,914 | ▲ +55.1% | Census |
| 1990 | 34,941 | ▲ +55.2% | Census |
| 1995 | 35,199 | ▲ +56.4% | Census |
| 2000 | 33,124 | ▲ +47.1% | Census |
| 2005 | 30,879 | ▲ +37.2% | Census |
| 2010 | 28,120 | ▲ +24.9% | Census |
| 2015 | 25,419 | ▲ +12.9% | Census |
| 2020 | 22,512 | — | Census |
| 2025 | 20,034 | ▼ -11.0% | Census |
| 2030 | 17,746 | ▼ -21.2% | Projection |
| 2035 | 15,528 | ▼ -31.0% | Projection |
| 2040 | 13,423 | ▼ -40.4% | Projection |
| 2045 | 11,463 | ▼ -49.1% | Projection |
| 2050 | 9,672 | ▼ -57.0% | Projection |
About Ootsuki
Overview
Ootsuki (大月市) is a municipality in Yamanashi, Japan, with a population of 20,034 as of 2025.
Population Projection of Ootsuki
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Ootsuki's population is expected to reach 17,746 by 2030 (-21.2%), 13,423 by 2040 (-40.4%), and 9,672 by 2050 (-57.0%). The town is projected to lose more than half its population over 30 years.
Aging Rate of Ootsuki
The aging rate (percentage of residents aged 65 and over) is 40.7% as of 2020 and is projected to rise to 59.9% by 2050. More than half of residents will be seniors, placing the town in the "marginal municipality" category.
National Comparison
Ootsuki is experiencing one of the faster rates of population decline in Japan.
National and Prefectural Rank
- Population decline rate: Ranked #120 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #110 out of 1903 nationwide.
- Population size: Ranked #1076 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