Wakayama和歌山県
Kozagawa 古座川町
Data last updated:
Kozagawa, Wakayama, Japan has a population of 2,164 (2025 national census). IPSS projections estimate 1,926 by 2030 and 1,112 by 2050 (a decrease of about 55.2% from 2020), with the share of residents aged 65+ rising from 55.2% in 2020 to 62.9%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
2,164
2030
(Projection)
1,926
▼ -22.3%
2040
(Projection)
1,475
▼ -40.5%
2050
(Projection)
1,112
▼ -55.2%
Change vs. 2020 census
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Other municipalities in Wakayama (和歌山県)
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.
Kozagawa 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 | 5,030 | ▲ +102.8% | Census |
| 1985 | 4,584 | ▲ +84.8% | Census |
| 1990 | 4,193 | ▲ +69.1% | Census |
| 1995 | 3,884 | ▲ +56.6% | Census |
| 2000 | 3,726 | ▲ +50.2% | Census |
| 2005 | 3,426 | ▲ +38.1% | Census |
| 2010 | 3,103 | ▲ +25.1% | Census |
| 2015 | 2,826 | ▲ +14.0% | Census |
| 2020 | 2,480 | — | Census |
| 2025 | 2,164 | ▼ -12.7% | Census |
| 2030 | 1,926 | ▼ -22.3% | Projection |
| 2035 | 1,689 | ▼ -31.9% | Projection |
| 2040 | 1,475 | ▼ -40.5% | Projection |
| 2045 | 1,280 | ▼ -48.4% | Projection |
| 2050 | 1,112 | ▼ -55.2% | Projection |
About Kozagawa
Overview
Kozagawa (古座川町) is a municipality in Wakayama, Japan, with a population of 2,164 as of 2025.
Population Projection of Kozagawa
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Kozagawa's population is expected to reach 1,926 by 2030 (-22.3%), 1,475 by 2040 (-40.5%), and 1,112 by 2050 (-55.2%). The town is projected to lose more than half its population over 30 years.
Aging Rate of Kozagawa
The aging rate (percentage of residents aged 65 and over) is 55.2% as of 2020 and is projected to rise to 62.9% by 2050. More than half of residents will be seniors, placing the town in the "marginal municipality" category.
National Comparison
Kozagawa is experiencing one of the faster rates of population decline in Japan.
National and Prefectural Rank
- Population decline rate: Ranked #167 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #57 out of 1903 nationwide.
- Population size: Ranked #1798 out of 1917 nationwide.
- Related: National rankings / All municipalities in Wakayama
Earnings in Wakayama (和歌山県): Average salary in Wakayama (和歌山県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure