Gunma群馬県
Ooizumi 大泉町
Data last updated:
Ooizumi, Gunma, Japan has a population of 41,417 (2025 national census). IPSS projections estimate 40,788 by 2030 and 35,955 by 2050 (a decrease of about 14.6% from 2020), with the share of residents aged 65+ rising from 22.7% in 2020 to 33.2%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
41,417
2030
(Projection)
40,788
▼ -3.1%
2040
(Projection)
38,614
▼ -8.3%
2050
(Projection)
35,955
▼ -14.6%
Change vs. 2020 census
Enter your age
See the population of 大泉町 when you turn 50, 60, 70 and 80.
Other municipalities in Gunma (群馬県)
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.
Ooizumi 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 | 31,282 | ▼ -25.7% | Census |
| 1985 | 35,925 | ▼ -14.6% | Census |
| 1990 | 39,232 | ▼ -6.8% | Census |
| 1995 | 41,100 | ▼ -2.3% | Census |
| 2000 | 41,403 | ▼ -1.6% | Census |
| 2005 | 41,466 | ▼ -1.5% | Census |
| 2010 | 40,257 | ▼ -4.4% | Census |
| 2015 | 41,202 | ▼ -2.1% | Census |
| 2020 | 42,089 | — | Census |
| 2025 | 41,417 | ▼ -1.6% | Census |
| 2030 | 40,788 | ▼ -3.1% | Projection |
| 2035 | 39,794 | ▼ -5.5% | Projection |
| 2040 | 38,614 | ▼ -8.3% | Projection |
| 2045 | 37,305 | ▼ -11.4% | Projection |
| 2050 | 35,955 | ▼ -14.6% | Projection |
About Ooizumi
Overview
Ooizumi (大泉町) is a municipality in Gunma, Japan, with a population of 41,417 as of 2025.
Population Projection of Ooizumi
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Ooizumi's population is expected to reach 40,788 by 2030 (-3.1%), 38,614 by 2040 (-8.3%), and 35,955 by 2050 (-14.6%). A modest population change is expected.
Aging Rate of Ooizumi
The aging rate (percentage of residents aged 65 and over) is 22.7% as of 2020 and is projected to rise to 33.2% by 2050. The aging rate will remain below the most severe Japanese averages.
National Comparison
Ooizumi's demographic trajectory is similar to the national average.
National and Prefectural Rank
- Population decline rate: Ranked #1491 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #1717 out of 1903 nationwide.
- Population size: Ranked #764 out of 1917 nationwide.
- Related: National rankings / All municipalities in Gunma
Earnings in Gunma (群馬県): Average salary in Gunma (群馬県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure