Nagano長野県
Iiyama 飯山市
Data last updated:
Iiyama, Nagano, Japan has a population of 17,682 (2025 national census). IPSS projections estimate 16,208 by 2030 and 10,400 by 2050 (a decrease of about 46.8% from 2020), with the share of residents aged 65+ rising from 38.1% in 2020 to 51.7%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025년
(실적)
17,682명
2030년
(추계)
16,208명
▼ -17.0%
2040년
(추계)
13,176명
▼ -32.6%
2050년
(추계)
10,400명
▼ -46.8%
Change vs. 2020 census
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Nagano (長野県)의 다른 시구정촌
데이터 출처
- 일본 정부 통계 종합 포털(e-Stat)（https://www.e-stat.go.jp/）
- 국립사회보장・인구문제연구소 「일본의 지역별 장래추계인구(레이와 5년 추계)」
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Iiyama 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 | 30,073 | ▲ +53.9% | Census |
| 1985 | 29,034 | ▲ +48.6% | Census |
| 1990 | 28,114 | ▲ +43.9% | Census |
| 1995 | 27,423 | ▲ +40.4% | Census |
| 2000 | 26,420 | ▲ +35.2% | Census |
| 2005 | 24,960 | ▲ +27.7% | Census |
| 2010 | 23,545 | ▲ +20.5% | Census |
| 2015 | 21,438 | ▲ +9.7% | Census |
| 2020 | 19,539 | — | Census |
| 2025 | 17,682 | ▼ -9.5% | Census |
| 2030 | 16,208 | ▼ -17.0% | Projection |
| 2035 | 14,659 | ▼ -25.0% | Projection |
| 2040 | 13,176 | ▼ -32.6% | Projection |
| 2045 | 11,753 | ▼ -39.8% | Projection |
| 2050 | 10,400 | ▼ -46.8% | Projection |
About Iiyama
Overview
Iiyama (飯山市) is a municipality in Nagano, Japan, with a population of 17,682 as of 2025.
Population Projection of Iiyama
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Iiyama's population is expected to reach 16,208 by 2030 (-17.0%), 13,176 by 2040 (-32.6%), and 10,400 by 2050 (-46.8%). A significant population decline is projected over the next three decades.
Aging Rate of Iiyama
The aging rate (percentage of residents aged 65 and over) is 38.1% as of 2020 and is projected to rise to 51.7% by 2050. More than half of residents will be seniors, placing the town in the "marginal municipality" category.
National Comparison
Iiyama is experiencing one of the faster rates of population decline in Japan.
National and Prefectural Rank
- Population decline rate: Ranked #458 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #445 out of 1903 nationwide.
- Population size: Ranked #1114 out of 1917 nationwide.
- Related: National rankings / All municipalities in Nagano
Nagano (長野県)의 소득 수준: Nagano (長野県)의 평균 연봉(연령·성별·기업 규모별)jpsalary / 후생노동성 임금구조 기본통계조사