Kanagawa神奈川県
Ooiso 大磯町
Data last updated:
Ooiso, Kanagawa, Japan has a population of 30,560 (2025 national census). IPSS projections estimate 29,920 by 2030 and 26,091 by 2050 (a decrease of about 17.5% from 2020), with the share of residents aged 65+ rising from 34.3% in 2020 to 43.3%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
30,560
2030
(Projection)
29,920
▼ -5.4%
2040
(Projection)
27,869
▼ -11.9%
2050
(Projection)
26,091
▼ -17.5%
Change vs. 2020 census
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Other municipalities in Kanagawa (神奈川県)
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.
Ooiso 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 | 29,931 | ▼ -5.4% | Census |
| 1985 | 31,211 | ▼ -1.3% | Census |
| 1990 | 31,599 | ▼ -0.1% | Census |
| 1995 | 32,285 | ▲ +2.1% | Census |
| 2000 | 32,259 | ▲ +2.0% | Census |
| 2005 | 32,590 | ▲ +3.0% | Census |
| 2010 | 33,032 | ▲ +4.4% | Census |
| 2015 | 31,550 | ▼ -0.3% | Census |
| 2020 | 31,634 | — | Census |
| 2025 | 30,560 | ▼ -3.4% | Census |
| 2030 | 29,920 | ▼ -5.4% | Projection |
| 2035 | 28,875 | ▼ -8.7% | Projection |
| 2040 | 27,869 | ▼ -11.9% | Projection |
| 2045 | 26,938 | ▼ -14.8% | Projection |
| 2050 | 26,091 | ▼ -17.5% | Projection |
About Ooiso
Overview
Ooiso (大磯町) is a municipality in Kanagawa, Japan, with a population of 30,560 as of 2025.
Population Projection of Ooiso
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Ooiso's population is expected to reach 29,920 by 2030 (-5.4%), 27,869 by 2040 (-11.9%), and 26,091 by 2050 (-17.5%). A modest population change is expected.
Aging Rate of Ooiso
The aging rate (percentage of residents aged 65 and over) is 34.3% as of 2020 and is projected to rise to 43.3% by 2050. Over 40% of residents will be elderly, significantly affecting healthcare and social services needs.
National Comparison
Ooiso's demographic trajectory is similar to the national average.
National and Prefectural Rank
- Population decline rate: Ranked #1419 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #998 out of 1903 nationwide.
- Population size: Ranked #892 out of 1917 nationwide.
- Related: National rankings / All municipalities in Kanagawa
Earnings in Kanagawa (神奈川県): Average salary in Kanagawa (神奈川県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure