Ibaraki茨城県
Kasumigaura かすみがうら市
Data last updated:
Kasumigaura, Ibaraki, Japan has a population of 38,396 (2025 national census). IPSS projections estimate 36,261 by 2030 and 27,514 by 2050 (a decrease of about 31.4% from 2020), with the share of residents aged 65+ rising from 31.9% in 2020 to 43.9%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025Census
38,396
2030Projection
36,261
▼ -9.5%
2040Projection
31,915
▼ -20.4%
2050Projection
27,514
▼ -31.4%
Change vs. 2020 census
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Other municipalities in Ibaraki (茨城県)
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.
Kasumigaura 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 | 38,797 | ▼ -3.2% | Census |
| 1985 | 41,306 | ▲ +3.0% | Census |
| 1990 | 43,013 | ▲ +7.3% | Census |
| 1995 | 45,288 | ▲ +13.0% | Census |
| 2000 | 45,229 | ▲ +12.8% | Census |
| 2005 | 44,603 | ▲ +11.3% | Census |
| 2010 | 43,553 | ▲ +8.6% | Census |
| 2015 | 42,147 | ▲ +5.1% | Census |
| 2020 | 40,087 | — | Census |
| 2025 | 38,396 | ▼ -4.2% | Census |
| 2030 | 36,261 | ▼ -9.5% | Projection |
| 2035 | 34,142 | ▼ -14.8% | Projection |
| 2040 | 31,915 | ▼ -20.4% | Projection |
| 2045 | 29,660 | ▼ -26.0% | Projection |
| 2050 | 27,514 | ▼ -31.4% | Projection |
About Kasumigaura
Overview
Kasumigaura (かすみがうら市) is a municipality in Ibaraki, Japan, with a population of 38,396 as of 2025.
Population Projection of Kasumigaura
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Kasumigaura's population is expected to reach 36,261 by 2030 (-9.5%), 31,915 by 2040 (-20.4%), and 27,514 by 2050 (-31.4%). A significant population decline is projected over the next three decades.
Aging Rate of Kasumigaura
The aging rate (percentage of residents aged 65 and over) is 31.9% as of 2020 and is projected to rise to 43.9% by 2050. Over 40% of residents will be elderly, significantly affecting healthcare and social services needs.
National Comparison
Kasumigaura's population decline rate exceeds the national average.
National and Prefectural Rank
- Population decline rate: Ranked #1015 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #957 out of 1903 nationwide.
- Population size: Ranked #795 out of 1917 nationwide.
- Related: National rankings / All municipalities in Ibaraki
Earnings in Ibaraki (茨城県): Average salary in Ibaraki (茨城県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure