Nagasaki長崎県
Isahaya 諫早市
Data last updated:
Isahaya, Nagasaki, Japan has a population of 130,092 (2025 national census). IPSS projections estimate 122,373 by 2030 and 93,988 by 2050 (a decrease of about 29.8% from 2020), with the share of residents aged 65+ rising from 30.6% in 2020 to 44.0%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
130,092
2030
(Projection)
122,373
▼ -8.6%
2040
(Projection)
108,568
▼ -18.9%
2050
(Projection)
93,988
▼ -29.8%
Change vs. 2020 census
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Other municipalities in Nagasaki (長崎県)
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.
Isahaya 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 | 127,339 | ▼ -4.9% | Census |
| 1985 | 134,804 | ▲ +0.7% | Census |
| 1990 | 138,918 | ▲ +3.8% | Census |
| 1995 | 142,517 | ▲ +6.5% | Census |
| 2000 | 144,299 | ▲ +7.8% | Census |
| 2005 | 144,034 | ▲ +7.6% | Census |
| 2010 | 140,752 | ▲ +5.2% | Census |
| 2015 | 138,078 | ▲ +3.2% | Census |
| 2020 | 133,852 | — | Census |
| 2025 | 130,092 | ▼ -2.8% | Census |
| 2030 | 122,373 | ▼ -8.6% | Projection |
| 2035 | 115,644 | ▼ -13.6% | Projection |
| 2040 | 108,568 | ▼ -18.9% | Projection |
| 2045 | 101,301 | ▼ -24.3% | Projection |
| 2050 | 93,988 | ▼ -29.8% | Projection |
About Isahaya
Overview
Isahaya (諫早市) is a municipality in Nagasaki, Japan, with a population of 130,092 as of 2025.
Population Projection of Isahaya
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Isahaya's population is expected to reach 122,373 by 2030 (-8.6%), 108,568 by 2040 (-18.9%), and 93,988 by 2050 (-29.8%). A significant population decline is projected over the next three decades.
Aging Rate of Isahaya
The aging rate (percentage of residents aged 65 and over) is 30.6% as of 2020 and is projected to rise to 44.0% by 2050. Over 40% of residents will be elderly, significantly affecting healthcare and social services needs.
National Comparison
Isahaya's population decline rate exceeds the national average.
National and Prefectural Rank
- Population decline rate: Ranked #1064 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #954 out of 1903 nationwide.
- Population size: Ranked #319 out of 1917 nationwide.
- Related: National rankings / All municipalities in Nagasaki
Earnings in Nagasaki (長崎県): Average salary in Nagasaki (長崎県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure