Niigata新潟県
Aga 阿賀町
Data last updated:
Aga, Niigata, Japan has a population of 8,338 (2025 national census). IPSS projections estimate 7,398 by 2030 and 3,802 by 2050 (a decrease of about 61.8% from 2020), with the share of residents aged 65+ rising from 49.6% in 2020 to 63.8%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
8,338
2030
(Projection)
7,398
▼ -25.8%
2040
(Projection)
5,382
▼ -46.0%
2050
(Projection)
3,802
▼ -61.8%
Change vs. 2020 census
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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.
Aga 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 | 20,280 | ▲ +103.5% | Census |
| 1985 | 18,526 | ▲ +85.9% | Census |
| 1990 | 17,557 | ▲ +76.2% | Census |
| 1995 | 16,786 | ▲ +68.4% | Census |
| 2000 | 15,813 | ▲ +58.7% | Census |
| 2005 | 14,703 | ▲ +47.5% | Census |
| 2010 | 13,303 | ▲ +33.5% | Census |
| 2015 | 11,680 | ▲ +17.2% | Census |
| 2020 | 9,965 | — | Census |
| 2025 | 8,338 | ▼ -16.3% | Census |
| 2030 | 7,398 | ▼ -25.8% | Projection |
| 2035 | 6,326 | ▼ -36.5% | Projection |
| 2040 | 5,382 | ▼ -46.0% | Projection |
| 2045 | 4,546 | ▼ -54.4% | Projection |
| 2050 | 3,802 | ▼ -61.8% | Projection |
About Aga
Overview
Aga (阿賀町) is a municipality in Niigata, Japan, with a population of 8,338 as of 2025.
Population Projection of Aga
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Aga's population is expected to reach 7,398 by 2030 (-25.8%), 5,382 by 2040 (-46.0%), and 3,802 by 2050 (-61.8%). The town is projected to lose more than half its population over 30 years.
Aging Rate of Aga
The aging rate (percentage of residents aged 65 and over) is 49.6% as of 2020 and is projected to rise to 63.8% by 2050. More than half of residents will be seniors, placing the town in the "marginal municipality" category.
National Comparison
Aga is among the most rapidly declining municipalities in Japan.
National and Prefectural Rank
- Population decline rate: Ranked #50 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #44 out of 1903 nationwide.
- Population size: Ranked #1413 out of 1917 nationwide.
- Related: National rankings / All municipalities in Niigata
Earnings in Niigata (新潟県): Average salary in Niigata (新潟県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure