日本人口减少模拟器

Nagano長野県

Iijima 飯島町

Data last updated:

Iijima, Nagano, Japan has a population of 9,007 (2020 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% to 48.7%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)

2020年

(实际)

9,007人

2030年

(预测)

7,898人

▼ -12.3%

2040年

(预测)

6,795人

▼ -24.6%

2050年

(预测)

5,734人

▼ -36.3%

老龄化率（65岁以上）: 2020年 37%→2050年 48.7%

Nagano (長野県)的其他市区町村

Nagano長野市Matsumoto松本市Ueda上田市Okaya岡谷市Iida飯田市Suwa諏訪市Suzaka須坂市Komoro小諸市Ina伊那市Komagane駒ヶ根市Nakano中野市Oomachi大町市Iiyama飯山市Chino茅野市Shiojiri塩尻市Saku佐久市Chikuma千曲市Toumi東御市Azumino安曇野市Koumi小海町
查看Nagano (長野県)的所有市区町村 →

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。

Iijima Population Projection Table (2020–2050)

Population by year, based on the national census and IPSS (2023) projections.

YearPopulationvs 2020Type
20209,007—Census
20258,454▼ -6.1%Projection
20307,898▼ -12.3%Projection
20357,347▼ -18.4%Projection
20406,795▼ -24.6%Projection
20456,261▼ -30.5%Projection
20505,734▼ -36.3%Projection

About Iijima

Overview

Iijima (飯島町) is a municipality in Nagano, Japan, with a population of 9,007 as of 2020.

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 (-24.6%), 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 #852 out of 1903 municipalities nationwide.
  • Aging rate in 2050: Ranked #652 out of 1903 nationwide.
  • Population size: Ranked #1418 out of 1916 nationwide.
  • Related: National rankings / All municipalities in Nagano

Frequently Asked Questions

Q.What is the current population of Iijima, Nagano?
A.According to the 2020 national census, Iijima has a population of 9,007.
Q.What is the population of Iijima in 2026?
A.Iijima's population in 2026 is estimated at approximately 8,343. This is an interpolated reference value between the 2020 census (9,007) and the IPSS projection for 2030 (7,898).
Q.What is the projected population of Iijima in the future?
A.According to IPSS projections, Iijima's population is expected to be 7,898 in 2030, 6,795 in 2040, and 5,734 in 2050.
Q.What is the population decline rate of Iijima?
A.Over the 30 years from 2020 to 2050, Iijima's population is projected to change by -36.3%. The 10-year change is -12.3% and the 20-year change is -24.6%.
Q.Why is the population of Iijima declining?
A.Nationwide, Japan's population decline is driven by natural decrease (deaths exceeding births) and, in regional municipalities, by net out-migration of young people to major metropolitan areas. In Iijima, the share of residents aged 65+ is projected to rise from 37.0% to 48.7% by 2050, which further accelerates natural decrease.
Q.What is the aging rate of Iijima?
A.Iijima's aging rate (percentage aged 65 and over) is 37.0% as of 2020, projected to rise to 48.7% by 2050.
Q.Where does this population data come from?
A.Historical data is sourced from Japan's national census via the e-Stat API (Statistics Bureau of Japan). Future projections are from the National Institute of Population and Social Security Research (IPSS) "Regional Population Projections 2023".
Q.Is the data up to date?
A.Historical data uses the 2020 national census results. Future projections use the IPSS 2023 edition. Data will be updated as new census results become available.

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