Shizuoka静岡県
Oyama 小山町
Data last updated:
Oyama, Shizuoka, Japan has a population of 17,100 (2025 national census). IPSS projections estimate 16,448 by 2030 and 12,349 by 2050 (a decrease of about 33.5% from 2020), with the share of residents aged 65+ rising from 30.0% in 2020 to 41.0%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
17,100
2030
(Projection)
16,448
▼ -11.4%
2040
(Projection)
14,410
▼ -22.4%
2050
(Projection)
12,349
▼ -33.5%
Change vs. 2020 census
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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.
Oyama 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 | 23,212 | ▲ +25.0% | Census |
| 1985 | 23,277 | ▲ +25.4% | Census |
| 1990 | 23,566 | ▲ +26.9% | Census |
| 1995 | 22,780 | ▲ +22.7% | Census |
| 2000 | 22,235 | ▲ +19.7% | Census |
| 2005 | 21,478 | ▲ +15.7% | Census |
| 2010 | 20,629 | ▲ +11.1% | Census |
| 2015 | 19,497 | ▲ +5.0% | Census |
| 2020 | 18,568 | — | Census |
| 2025 | 17,100 | ▼ -7.9% | Census |
| 2030 | 16,448 | ▼ -11.4% | Projection |
| 2035 | 15,430 | ▼ -16.9% | Projection |
| 2040 | 14,410 | ▼ -22.4% | Projection |
| 2045 | 13,383 | ▼ -27.9% | Projection |
| 2050 | 12,349 | ▼ -33.5% | Projection |
About Oyama
Overview
Oyama (小山町) is a municipality in Shizuoka, Japan, with a population of 17,100 as of 2025.
Population Projection of Oyama
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Oyama's population is expected to reach 16,448 by 2030 (-11.4%), 14,410 by 2040 (-22.4%), and 12,349 by 2050 (-33.5%). A significant population decline is projected over the next three decades.
Aging Rate of Oyama
The aging rate (percentage of residents aged 65 and over) is 30.0% as of 2020 and is projected to rise to 41.0% by 2050. Over 40% of residents will be elderly, significantly affecting healthcare and social services needs.
National Comparison
Oyama's population decline rate exceeds the national average.
National and Prefectural Rank
- Population decline rate: Ranked #941 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #1170 out of 1903 nationwide.
- Population size: Ranked #1135 out of 1917 nationwide.
- Related: National rankings / All municipalities in Shizuoka
Earnings in Shizuoka (静岡県): Average salary in Shizuoka (静岡県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure