Kagoshima鹿児島県
Isa 伊佐市
Data last updated:
Isa, Kagoshima, Japan has a population of 21,375 (2025 national census). IPSS projections estimate 20,044 by 2030 and 13,332 by 2050 (a decrease of about 45.5% from 2020), with the share of residents aged 65+ rising from 41.6% in 2020 to 48.8%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
21,375
2030
(Projection)
20,044
▼ -18.0%
2040
(Projection)
16,421
▼ -32.8%
2050
(Projection)
13,332
▼ -45.5%
Change vs. 2020 census
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Other municipalities in Kagoshima (鹿児島県)
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.
Isa 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 | 38,310 | ▲ +56.7% | Census |
| 1985 | 37,483 | ▲ +53.3% | Census |
| 1990 | 36,146 | ▲ +47.8% | Census |
| 1995 | 35,007 | ▲ +43.2% | Census |
| 2000 | 33,508 | ▲ +37.0% | Census |
| 2005 | 31,499 | ▲ +28.8% | Census |
| 2010 | 29,304 | ▲ +19.8% | Census |
| 2015 | 26,810 | ▲ +9.6% | Census |
| 2020 | 24,453 | — | Census |
| 2025 | 21,375 | ▼ -12.6% | Census |
| 2030 | 20,044 | ▼ -18.0% | Projection |
| 2035 | 18,154 | ▼ -25.8% | Projection |
| 2040 | 16,421 | ▼ -32.8% | Projection |
| 2045 | 14,816 | ▼ -39.4% | Projection |
| 2050 | 13,332 | ▼ -45.5% | Projection |
About Isa
Overview
Isa (伊佐市) is a municipality in Kagoshima, Japan, with a population of 21,375 as of 2025.
Population Projection of Isa
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Isa's population is expected to reach 20,044 by 2030 (-18.0%), 16,421 by 2040 (-32.8%), and 13,332 by 2050 (-45.5%). A significant population decline is projected over the next three decades.
Aging Rate of Isa
The aging rate (percentage of residents aged 65 and over) is 41.6% as of 2020 and is projected to rise to 48.8% by 2050. Over 40% of residents will be elderly, significantly affecting healthcare and social services needs.
National Comparison
Isa is experiencing one of the faster rates of population decline in Japan.
National and Prefectural Rank
- Population decline rate: Ranked #512 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #647 out of 1903 nationwide.
- Population size: Ranked #1051 out of 1917 nationwide.
- Related: National rankings / All municipalities in Kagoshima
Earnings in Kagoshima (鹿児島県): Average salary in Kagoshima (鹿児島県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure