Gunma群馬県
Tomioka 富岡市
Data last updated:
Tomioka, Gunma, Japan has a population of 43,771 (2025 national census). IPSS projections estimate 41,428 by 2030 and 30,374 by 2050 (a decrease of about 36.0% from 2020), with the share of residents aged 65+ rising from 34.6% in 2020 to 49.0%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
43,771
2030
(Projection)
41,428
▼ -12.7%
2040
(Projection)
35,903
▼ -24.3%
2050
(Projection)
30,374
▼ -36.0%
Change vs. 2020 census
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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.
Tomioka 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 | 53,200 | ▲ +12.1% | Census |
| 1985 | 53,768 | ▲ +13.3% | Census |
| 1990 | 54,259 | ▲ +14.4% | Census |
| 1995 | 54,435 | ▲ +14.7% | Census |
| 2000 | 54,401 | ▲ +14.7% | Census |
| 2005 | 53,765 | ▲ +13.3% | Census |
| 2010 | 52,070 | ▲ +9.7% | Census |
| 2015 | 49,746 | ▲ +4.8% | Census |
| 2020 | 47,446 | — | Census |
| 2025 | 43,771 | ▼ -7.7% | Census |
| 2030 | 41,428 | ▼ -12.7% | Projection |
| 2035 | 38,715 | ▼ -18.4% | Projection |
| 2040 | 35,903 | ▼ -24.3% | Projection |
| 2045 | 33,076 | ▼ -30.3% | Projection |
| 2050 | 30,374 | ▼ -36.0% | Projection |
About Tomioka
Overview
Tomioka (富岡市) is a municipality in Gunma, Japan, with a population of 43,771 as of 2025.
Population Projection of Tomioka
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Tomioka's population is expected to reach 41,428 by 2030 (-12.7%), 35,903 by 2040 (-24.3%), and 30,374 by 2050 (-36.0%). A significant population decline is projected over the next three decades.
Aging Rate of Tomioka
The aging rate (percentage of residents aged 65 and over) is 34.6% as of 2020 and is projected to rise to 49.0% by 2050. Over 40% of residents will be elderly, significantly affecting healthcare and social services needs.
National Comparison
Tomioka's population decline rate exceeds the national average.
National and Prefectural Rank
- Population decline rate: Ranked #859 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #624 out of 1903 nationwide.
- Population size: Ranked #741 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