Tokushima徳島県
Kaiyou 海陽町
Data last updated:
Kaiyou, Tokushima, Japan has a population of 7,387 (2025 national census). IPSS projections estimate 6,600 by 2030 and 3,720 by 2050 (a decrease of about 55.5% from 2020), with the share of residents aged 65+ rising from 46.6% in 2020 to 60.4%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
7,387
2030
(Projection)
6,600
▼ -21.0%
2040
(Projection)
5,043
▼ -39.7%
2050
(Projection)
3,720
▼ -55.5%
Change vs. 2020 census
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Other municipalities in Tokushima (徳島県)
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.
Kaiyou 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 | 14,397 | ▲ +72.3% | Census |
| 1985 | 13,915 | ▲ +66.5% | Census |
| 1990 | 12,949 | ▲ +54.9% | Census |
| 1995 | 12,399 | ▲ +48.3% | Census |
| 2000 | 12,104 | ▲ +44.8% | Census |
| 2005 | 11,507 | ▲ +37.7% | Census |
| 2010 | 10,446 | ▲ +25.0% | Census |
| 2015 | 9,283 | ▲ +11.1% | Census |
| 2020 | 8,358 | — | Census |
| 2025 | 7,387 | ▼ -11.6% | Census |
| 2030 | 6,600 | ▼ -21.0% | Projection |
| 2035 | 5,795 | ▼ -30.7% | Projection |
| 2040 | 5,043 | ▼ -39.7% | Projection |
| 2045 | 4,351 | ▼ -47.9% | Projection |
| 2050 | 3,720 | ▼ -55.5% | Projection |
About Kaiyou
Overview
Kaiyou (海陽町) is a municipality in Tokushima, Japan, with a population of 7,387 as of 2025.
Population Projection of Kaiyou
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Kaiyou's population is expected to reach 6,600 by 2030 (-21.0%), 5,043 by 2040 (-39.7%), and 3,720 by 2050 (-55.5%). The town is projected to lose more than half its population over 30 years.
Aging Rate of Kaiyou
The aging rate (percentage of residents aged 65 and over) is 46.6% as of 2020 and is projected to rise to 60.4% by 2050. More than half of residents will be seniors, placing the town in the "marginal municipality" category.
National Comparison
Kaiyou is experiencing one of the faster rates of population decline in Japan.
National and Prefectural Rank
- Population decline rate: Ranked #158 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #93 out of 1903 nationwide.
- Population size: Ranked #1455 out of 1917 nationwide.
- Related: National rankings / All municipalities in Tokushima
Earnings in Tokushima (徳島県): Average salary in Tokushima (徳島県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure