Nagano長野県
Iida 飯田市
Data last updated:
Iida, Nagano, Japan has a population of 90,765 (2025 national census). IPSS projections estimate 89,644 by 2030 and 72,714 by 2050 (a decrease of about 25.9% from 2020), with the share of residents aged 65+ rising from 32.8% in 2020 to 40.9%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
90,765
2030
(Projection)
89,644
▼ -8.7%
2040
(Projection)
81,330
▼ -17.1%
2050
(Projection)
72,714
▼ -25.9%
Change vs. 2020 census
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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.
Iida 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 | 109,465 | ▲ +11.5% | Census |
| 1985 | 111,009 | ▲ +13.1% | Census |
| 1990 | 110,402 | ▲ +12.5% | Census |
| 1995 | 110,204 | ▲ +12.3% | Census |
| 2000 | 110,589 | ▲ +12.7% | Census |
| 2005 | 108,624 | ▲ +10.7% | Census |
| 2010 | 105,335 | ▲ +7.3% | Census |
| 2015 | 101,581 | ▲ +3.5% | Census |
| 2020 | 98,164 | — | Census |
| 2025 | 90,765 | ▼ -7.5% | Census |
| 2030 | 89,644 | ▼ -8.7% | Projection |
| 2035 | 85,490 | ▼ -12.9% | Projection |
| 2040 | 81,330 | ▼ -17.1% | Projection |
| 2045 | 77,092 | ▼ -21.5% | Projection |
| 2050 | 72,714 | ▼ -25.9% | Projection |
About Iida
Overview
Iida (飯田市) is a municipality in Nagano, Japan, with a population of 90,765 as of 2025.
Population Projection of Iida
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Iida's population is expected to reach 89,644 by 2030 (-8.7%), 81,330 by 2040 (-17.1%), and 72,714 by 2050 (-25.9%). A significant population decline is projected over the next three decades.
Aging Rate of Iida
The aging rate (percentage of residents aged 65 and over) is 32.8% as of 2020 and is projected to rise to 40.9% by 2050. Over 40% of residents will be elderly, significantly affecting healthcare and social services needs.
National Comparison
Iida's population decline rate exceeds the national average.
National and Prefectural Rank
- Population decline rate: Ranked #1179 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #1179 out of 1903 nationwide.
- Population size: Ranked #451 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