Saitama埼玉県
Koshigaya 越谷市
Data last updated:
Koshigaya, Saitama, Japan has a population of 341,497 (2025 national census). IPSS projections estimate 343,314 by 2030 and 330,327 by 2050 (a decrease of about 3.3% from 2020), with the share of residents aged 65+ rising from 25.5% in 2020 to 33.0%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
341,497
2030
(Projection)
343,314
▲ +0.5%
2040
(Projection)
337,927
▼ -1.1%
2050
(Projection)
330,327
▼ -3.3%
Change vs. 2020 census
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Other municipalities in Saitama (埼玉県)
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.
Koshigaya 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 | 223,241 | ▼ -34.7% | Census |
| 1985 | 253,479 | ▼ -25.8% | Census |
| 1990 | 285,259 | ▼ -16.5% | Census |
| 1995 | 298,253 | ▼ -12.7% | Census |
| 2000 | 308,307 | ▼ -9.8% | Census |
| 2005 | 315,792 | ▼ -7.6% | Census |
| 2010 | 326,313 | ▼ -4.5% | Census |
| 2015 | 337,498 | ▼ -1.2% | Census |
| 2020 | 341,621 | — | Census |
| 2025 | 341,497 | → 0.0% | Census |
| 2030 | 343,314 | ▲ +0.5% | Projection |
| 2035 | 341,076 | ▼ -0.2% | Projection |
| 2040 | 337,927 | ▼ -1.1% | Projection |
| 2045 | 334,379 | ▼ -2.1% | Projection |
| 2050 | 330,327 | ▼ -3.3% | Projection |
About Koshigaya
Overview
Koshigaya (越谷市) is a municipality in Saitama, Japan, with a population of 341,497 as of 2025.
Population Projection of Koshigaya
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Koshigaya's population is expected to reach 343,314 by 2030 (+0.5%), 337,927 by 2040 (-1.1%), and 330,327 by 2050 (-3.3%). A modest population change is expected.
Aging Rate of Koshigaya
The aging rate (percentage of residents aged 65 and over) is 25.5% as of 2020 and is projected to rise to 33.0% by 2050. The aging rate will remain below the most severe Japanese averages.
National Comparison
Koshigaya's demographic trajectory is similar to the national average.
National and Prefectural Rank
- Population decline rate: Ranked #1747 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #1733 out of 1903 nationwide.
- Population size: Ranked #75 out of 1917 nationwide.
- Related: National rankings / All municipalities in Saitama
Earnings in Saitama (埼玉県): Average salary in Saitama (埼玉県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure