Nagano長野県
Okaya 岡谷市
Data last updated:
Okaya, Nagano, Japan has a population of 44,482 (2025 national census). IPSS projections estimate 42,053 by 2030 and 31,505 by 2050 (a decrease of about 34.1% from 2020), with the share of residents aged 65+ rising from 34.7% in 2020 to 43.6%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
44,482
2030
(Projection)
42,053
▼ -12.0%
2040
(Projection)
36,567
▼ -23.5%
2050
(Projection)
31,505
▼ -34.1%
Change vs. 2020 census
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Other municipalities in Nagano (長野県)
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.
Okaya 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 | 62,210 | ▲ +30.2% | Census |
| 1985 | 61,747 | ▲ +29.2% | Census |
| 1990 | 59,849 | ▲ +25.2% | Census |
| 1995 | 58,056 | ▲ +21.5% | Census |
| 2000 | 56,401 | ▲ +18.0% | Census |
| 2005 | 54,699 | ▲ +14.5% | Census |
| 2010 | 52,841 | ▲ +10.6% | Census |
| 2015 | 50,128 | ▲ +4.9% | Census |
| 2020 | 47,790 | — | Census |
| 2025 | 44,482 | ▼ -6.9% | Census |
| 2030 | 42,053 | ▼ -12.0% | Projection |
| 2035 | 39,286 | ▼ -17.8% | Projection |
| 2040 | 36,567 | ▼ -23.5% | Projection |
| 2045 | 33,973 | ▼ -28.9% | Projection |
| 2050 | 31,505 | ▼ -34.1% | Projection |
About Okaya
Overview
Okaya (岡谷市) is a municipality in Nagano, Japan, with a population of 44,482 as of 2025.
Population Projection of Okaya
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Okaya's population is expected to reach 42,053 by 2030 (-12.0%), 36,567 by 2040 (-23.5%), and 31,505 by 2050 (-34.1%). A significant population decline is projected over the next three decades.
Aging Rate of Okaya
The aging rate (percentage of residents aged 65 and over) is 34.7% as of 2020 and is projected to rise to 43.6% by 2050. Over 40% of residents will be elderly, significantly affecting healthcare and social services needs.
National Comparison
Okaya's population decline rate exceeds the national average.
National and Prefectural Rank
- Population decline rate: Ranked #922 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #975 out of 1903 nationwide.
- Population size: Ranked #730 out of 1917 nationwide.
- Related: National rankings / All municipalities in Nagano
Earnings in Nagano (長野県): Average salary in Nagano (長野県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure