Yamaguchi山口県
Yanai 柳井市
Data last updated:
Yanai, Yamaguchi, Japan has a population of 28,512 (2025 national census). IPSS projections estimate 26,548 by 2030 and 19,224 by 2050 (a decrease of about 37.6% from 2020), with the share of residents aged 65+ rising from 39.2% in 2020 to 48.0%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
28,512
2030
(Projection)
26,548
▼ -13.8%
2040
(Projection)
22,729
▼ -26.2%
2050
(Projection)
19,224
▼ -37.6%
Change vs. 2020 census
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Other municipalities in Yamaguchi (山口県)
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.
Yanai 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 | 42,912 | ▲ +39.3% | Census |
| 1985 | 41,798 | ▲ +35.7% | Census |
| 1990 | 40,478 | ▲ +31.4% | Census |
| 1995 | 38,963 | ▲ +26.5% | Census |
| 2000 | 37,251 | ▲ +20.9% | Census |
| 2005 | 35,927 | ▲ +16.6% | Census |
| 2010 | 34,730 | ▲ +12.8% | Census |
| 2015 | 32,945 | ▲ +7.0% | Census |
| 2020 | 30,799 | — | Census |
| 2025 | 28,512 | ▼ -7.4% | Census |
| 2030 | 26,548 | ▼ -13.8% | Projection |
| 2035 | 24,629 | ▼ -20.0% | Projection |
| 2040 | 22,729 | ▼ -26.2% | Projection |
| 2045 | 20,944 | ▼ -32.0% | Projection |
| 2050 | 19,224 | ▼ -37.6% | Projection |
About Yanai
Overview
Yanai (柳井市) is a municipality in Yamaguchi, Japan, with a population of 28,512 as of 2025.
Population Projection of Yanai
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Yanai's population is expected to reach 26,548 by 2030 (-13.8%), 22,729 by 2040 (-26.2%), and 19,224 by 2050 (-37.6%). A significant population decline is projected over the next three decades.
Aging Rate of Yanai
The aging rate (percentage of residents aged 65 and over) is 39.2% as of 2020 and is projected to rise to 48.0% by 2050. Over 40% of residents will be elderly, significantly affecting healthcare and social services needs.
National Comparison
Yanai's population decline rate exceeds the national average.
National and Prefectural Rank
- Population decline rate: Ranked #807 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #690 out of 1903 nationwide.
- Population size: Ranked #935 out of 1917 nationwide.
- Related: National rankings / All municipalities in Yamaguchi
Earnings in Yamaguchi (山口県): Average salary in Yamaguchi (山口県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure