Ibaraki茨城県
Sakai 境町
Data last updated:
Sakai, Ibaraki, Japan has a population of 23,885 (2025 national census). IPSS projections estimate 22,598 by 2030 and 18,102 by 2050 (a decrease of about 25.2% from 2020), with the share of residents aged 65+ rising from 29.1% in 2020 to 39.6%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025Census
23,885
2030Projection
22,598
▼ -6.6%
2040Projection
20,424
▼ -15.6%
2050Projection
18,102
▼ -25.2%
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.
Sakai 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 | 25,696 | ▲ +6.2% | Census |
| 1985 | 26,297 | ▲ +8.7% | Census |
| 1990 | 26,922 | ▲ +11.2% | Census |
| 1995 | 27,237 | ▲ +12.5% | Census |
| 2000 | 27,171 | ▲ +12.3% | Census |
| 2005 | 26,468 | ▲ +9.4% | Census |
| 2010 | 25,714 | ▲ +6.3% | Census |
| 2015 | 24,517 | ▲ +1.3% | Census |
| 2020 | 24,201 | — | Census |
| 2025 | 23,885 | ▼ -1.3% | Census |
| 2030 | 22,598 | ▼ -6.6% | Projection |
| 2035 | 21,557 | ▼ -10.9% | Projection |
| 2040 | 20,424 | ▼ -15.6% | Projection |
| 2045 | 19,260 | ▼ -20.4% | Projection |
| 2050 | 18,102 | ▼ -25.2% | Projection |
About Sakai
Overview
Sakai (境町) is a municipality in Ibaraki, Japan, with a population of 23,885 as of 2025.
Population Projection of Sakai
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Sakai's population is expected to reach 22,598 by 2030 (-6.6%), 20,424 by 2040 (-15.6%), and 18,102 by 2050 (-25.2%). A significant population decline is projected over the next three decades.
Aging Rate of Sakai
The aging rate (percentage of residents aged 65 and over) is 29.1% as of 2020 and is projected to rise to 39.6% by 2050. The aging rate will remain below the most severe Japanese averages.
National Comparison
Sakai's population decline rate exceeds the national average.
National and Prefectural Rank
- Population decline rate: Ranked #1199 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #1295 out of 1903 nationwide.
- Population size: Ranked #1009 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