Tokyo東京都
Kokubunji 国分寺市
Data last updated:
Kokubunji, Tokyo, Japan has a population of 128,033 (2025 national census). IPSS projections estimate 132,981 by 2030 and 130,403 by 2050 (an increase of about 0.9% from 2020), with the share of residents aged 65+ rising from 21.7% in 2020 to 29.4%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025Census
128,033
2030Projection
132,981
▲ +2.9%
2040Projection
133,144
▲ +3.0%
2050Projection
130,403
▲ +0.9%
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.
Kokubunji 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 | 91,010 | ▼ -29.6% | Census |
| 1985 | 95,467 | ▼ -26.1% | Census |
| 1990 | 100,982 | ▼ -21.9% | Census |
| 1995 | 105,786 | ▼ -18.1% | Census |
| 2000 | 111,404 | ▼ -13.8% | Census |
| 2005 | 117,604 | ▼ -9.0% | Census |
| 2010 | 120,650 | ▼ -6.6% | Census |
| 2015 | 122,742 | ▼ -5.0% | Census |
| 2020 | 129,242 | — | Census |
| 2025 | 128,033 | ▼ -0.9% | Census |
| 2030 | 132,981 | ▲ +2.9% | Projection |
| 2035 | 133,480 | ▲ +3.3% | Projection |
| 2040 | 133,144 | ▲ +3.0% | Projection |
| 2045 | 131,964 | ▲ +2.1% | Projection |
| 2050 | 130,403 | ▲ +0.9% | Projection |
About Kokubunji
Overview
Kokubunji (国分寺市) is a municipality in Tokyo, Japan, with a population of 128,033 as of 2025.
Population Projection of Kokubunji
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Kokubunji's population is expected to reach 132,981 by 2030 (+2.9%), 133,144 by 2040 (+3.0%), and 130,403 by 2050 (+0.9%). Kokubunji is among the rare Japanese municipalities projected to see population growth.
Aging Rate of Kokubunji
The aging rate (percentage of residents aged 65 and over) is 21.7% as of 2020 and is projected to rise to 29.4% by 2050. The aging rate will remain below the most severe Japanese averages.
National Comparison
Kokubunji's demographic trajectory is similar to the national average.
National and Prefectural Rank
- Population decline rate: Ranked #1807 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #1842 out of 1903 nationwide.
- Population size: Ranked #329 out of 1917 nationwide.
- Related: National rankings / All municipalities in Tokyo
Earnings in Tokyo (東京都): Average salary in Tokyo (東京都) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure