Nagano長野県
Iijima 飯島町
Data last updated:
Iijima, Nagano, Japan has a population of 8,491 (2025 national census). IPSS projections estimate 7,898 by 2030 and 5,734 by 2050 (a decrease of about 36.3% from 2020), with the share of residents aged 65+ rising from 37.0% in 2020 to 48.7%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
8,491
2030
(Projection)
7,898
▼ -12.3%
2040
(Projection)
6,795
▼ -24.5%
2050
(Projection)
5,734
▼ -36.3%
Change vs. 2020 census
Enter your age
See the population of 飯島町 when you turn 50, 60, 70 and 80.
Other municipalities in Nagano (長野県)
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.
Iijima 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 | 10,515 | ▲ +16.8% | Census |
| 1985 | 10,705 | ▲ +18.9% | Census |
| 1990 | 10,801 | ▲ +20.0% | Census |
| 1995 | 10,989 | ▲ +22.0% | Census |
| 2000 | 10,895 | ▲ +21.0% | Census |
| 2005 | 10,570 | ▲ +17.4% | Census |
| 2010 | 9,902 | ▲ +10.0% | Census |
| 2015 | 9,530 | ▲ +5.8% | Census |
| 2020 | 9,004 | — | Census |
| 2025 | 8,491 | ▼ -5.7% | Census |
| 2030 | 7,898 | ▼ -12.3% | Projection |
| 2035 | 7,347 | ▼ -18.4% | Projection |
| 2040 | 6,795 | ▼ -24.5% | Projection |
| 2045 | 6,261 | ▼ -30.5% | Projection |
| 2050 | 5,734 | ▼ -36.3% | Projection |
About Iijima
Overview
Iijima (飯島町) is a municipality in Nagano, Japan, with a population of 8,491 as of 2025.
Population Projection of Iijima
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Iijima's population is expected to reach 7,898 by 2030 (-12.3%), 6,795 by 2040 (-24.5%), and 5,734 by 2050 (-36.3%). A significant population decline is projected over the next three decades.
Aging Rate of Iijima
The aging rate (percentage of residents aged 65 and over) is 37.0% as of 2020 and is projected to rise to 48.7% by 2050. Over 40% of residents will be elderly, significantly affecting healthcare and social services needs.
National Comparison
Iijima's population decline rate exceeds the national average.
National and Prefectural Rank
- Population decline rate: Ranked #848 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #652 out of 1903 nationwide.
- Population size: Ranked #1405 out of 1917 nationwide.
- Related: National rankings / All municipalities in Nagano
Earnings in Nagano (長野県): Average salary in Nagano (長野県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure