Chiba千葉県
Inzai 印西市
Data last updated:
Inzai, Chiba, Japan has a population of 110,339 (2025 national census). IPSS projections estimate 113,660 by 2030 and 119,819 by 2050 (an increase of about 16.8% from 2020), with the share of residents aged 65+ rising from 23.2% in 2020 to 31.8%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025Census
110,339
2030Projection
113,660
▲ +10.8%
2040Projection
118,444
▲ +15.4%
2050Projection
119,819
▲ +16.8%
Change vs. 2020 census
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Other municipalities in Chiba (千葉県)
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.
Inzai 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 | 29,970 | ▼ -70.8% | Census |
| 1985 | 35,745 | ▼ -65.2% | Census |
| 1990 | 55,131 | ▼ -46.3% | Census |
| 1995 | 72,278 | ▼ -29.6% | Census |
| 2000 | 79,780 | ▼ -22.2% | Census |
| 2005 | 81,102 | ▼ -21.0% | Census |
| 2010 | 88,176 | ▼ -14.1% | Census |
| 2015 | 92,670 | ▼ -9.7% | Census |
| 2020 | 102,609 | — | Census |
| 2025 | 110,339 | ▲ +7.5% | Census |
| 2030 | 113,660 | ▲ +10.8% | Projection |
| 2035 | 116,621 | ▲ +13.7% | Projection |
| 2040 | 118,444 | ▲ +15.4% | Projection |
| 2045 | 119,404 | ▲ +16.4% | Projection |
| 2050 | 119,819 | ▲ +16.8% | Projection |
About Inzai
Overview
Inzai (印西市) is a municipality in Chiba, Japan, with a population of 110,339 as of 2025.
Population Projection of Inzai
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Inzai's population is expected to reach 113,660 by 2030 (+10.8%), 118,444 by 2040 (+15.4%), and 119,819 by 2050 (+16.8%). Inzai is among the rare Japanese municipalities projected to see population growth.
Aging Rate of Inzai
The aging rate (percentage of residents aged 65 and over) is 23.2% as of 2020 and is projected to rise to 31.8% by 2050. The aging rate will remain below the most severe Japanese averages.
National Comparison
Inzai stands out as one of the few Japanese municipalities with continued population growth.
National and Prefectural Rank
- Population decline rate: Ranked #1898 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #1776 out of 1903 nationwide.
- Population size: Ranked #374 out of 1917 nationwide.
- Related: National rankings / All municipalities in Chiba
Earnings in Chiba (千葉県): Average salary in Chiba (千葉県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure