Chiba千葉県
Ichihara 市原市
Data last updated:
Ichihara, Chiba, Japan has a population of 259,897 (2025 national census). IPSS projections estimate 250,863 by 2030 and 207,507 by 2050 (a decrease of about 23.0% from 2020), with the share of residents aged 65+ rising from 29.7% in 2020 to 39.0%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
259,897
2030
(Projection)
250,863
▼ -6.9%
2040
(Projection)
229,289
▼ -14.9%
2050
(Projection)
207,507
▼ -23.0%
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.
Ichihara 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 | 216,394 | ▼ -19.7% | Census |
| 1985 | 237,617 | ▼ -11.8% | Census |
| 1990 | 257,716 | ▼ -4.4% | Census |
| 1995 | 277,061 | ▲ +2.8% | Census |
| 2000 | 278,218 | ▲ +3.2% | Census |
| 2005 | 280,255 | ▲ +4.0% | Census |
| 2010 | 280,416 | ▲ +4.0% | Census |
| 2015 | 274,656 | ▲ +1.9% | Census |
| 2020 | 269,524 | — | Census |
| 2025 | 259,897 | ▼ -3.6% | Census |
| 2030 | 250,863 | ▼ -6.9% | Projection |
| 2035 | 240,486 | ▼ -10.8% | Projection |
| 2040 | 229,289 | ▼ -14.9% | Projection |
| 2045 | 218,144 | ▼ -19.1% | Projection |
| 2050 | 207,507 | ▼ -23.0% | Projection |
About Ichihara
Overview
Ichihara (市原市) is a municipality in Chiba, Japan, with a population of 259,897 as of 2025.
Population Projection of Ichihara
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Ichihara's population is expected to reach 250,863 by 2030 (-6.9%), 229,289 by 2040 (-14.9%), and 207,507 by 2050 (-23.0%). A significant population decline is projected over the next three decades.
Aging Rate of Ichihara
The aging rate (percentage of residents aged 65 and over) is 29.7% as of 2020 and is projected to rise to 39.0% by 2050. The aging rate will remain below the most severe Japanese averages.
National Comparison
Ichihara's population decline rate exceeds the national average.
National and Prefectural Rank
- Population decline rate: Ranked #1258 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #1340 out of 1903 nationwide.
- Population size: Ranked #113 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