Ehime愛媛県
Seiyo 西予市
Data last updated:
Seiyo, Ehime, Japan has a population of 31,628 (2025 national census). IPSS projections estimate 28,848 by 2030 and 18,200 by 2050 (a decrease of about 48.6% from 2020), with the share of residents aged 65+ rising from 44.1% in 2020 to 54.0%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025年
(实际)
31,628人
2030年
(预测)
28,848人
▼ -18.5%
2040年
(预测)
23,128人
▼ -34.6%
2050年
(预测)
18,200人
▼ -48.6%
Change vs. 2020 census
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Ehime (愛媛県)的其他市区町村
数据来源
- 日本政府统计综合窗口(e-Stat)（https://www.e-stat.go.jp/）
- 国立社会保障・人口问题研究所「日本地区别未来推计人口（令和5年推计）」
※本服务使用e-Stat的API功能，但服务内容不受日本政府保证。
Seiyo 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 | 56,175 | ▲ +58.7% | Census |
| 1985 | 54,804 | ▲ +54.9% | Census |
| 1990 | 51,893 | ▲ +46.6% | Census |
| 1995 | 49,022 | ▲ +38.5% | Census |
| 2000 | 47,217 | ▲ +33.4% | Census |
| 2005 | 44,948 | ▲ +27.0% | Census |
| 2010 | 42,080 | ▲ +18.9% | Census |
| 2015 | 38,919 | ▲ +10.0% | Census |
| 2020 | 35,388 | — | Census |
| 2025 | 31,628 | ▼ -10.6% | Census |
| 2030 | 28,848 | ▼ -18.5% | Projection |
| 2035 | 25,881 | ▼ -26.9% | Projection |
| 2040 | 23,128 | ▼ -34.6% | Projection |
| 2045 | 20,560 | ▼ -41.9% | Projection |
| 2050 | 18,200 | ▼ -48.6% | Projection |
About Seiyo
Overview
Seiyo (西予市) is a municipality in Ehime, Japan, with a population of 31,628 as of 2025.
Population Projection of Seiyo
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Seiyo's population is expected to reach 28,848 by 2030 (-18.5%), 23,128 by 2040 (-34.6%), and 18,200 by 2050 (-48.6%). A significant population decline is projected over the next three decades.
Aging Rate of Seiyo
The aging rate (percentage of residents aged 65 and over) is 44.1% as of 2020 and is projected to rise to 54.0% by 2050. More than half of residents will be seniors, placing the town in the "marginal municipality" category.
National Comparison
Seiyo is experiencing one of the faster rates of population decline in Japan.
National and Prefectural Rank
- Population decline rate: Ranked #392 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #328 out of 1903 nationwide.
- Population size: Ranked #872 out of 1917 nationwide.
- Related: National rankings / All municipalities in Ehime
Ehime (愛媛県)的收入水平: Ehime (愛媛県)的平均年收入（按年龄、性别、企业规模）jpsalary / 厚生劳动省 工资结构基本统计调查