Nagano長野県
Saku 佐久市
Data last updated:
Saku, Nagano, Japan has a population of 97,017 (2025 national census). IPSS projections estimate 94,660 by 2030 and 85,580 by 2050 (a decrease of about 12.9% from 2020), with the share of residents aged 65+ rising from 30.9% in 2020 to 39.2%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
97,017
2030
(Projection)
94,660
▼ -3.6%
2040
(Projection)
90,517
▼ -7.8%
2050
(Projection)
85,580
▼ -12.9%
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.
Saku 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 | 91,285 | ▼ -7.0% | Census |
| 1985 | 93,895 | ▼ -4.4% | Census |
| 1990 | 95,625 | ▼ -2.6% | Census |
| 1995 | 97,813 | ▼ -0.4% | Census |
| 2000 | 100,016 | ▲ +1.9% | Census |
| 2005 | 100,462 | ▲ +2.3% | Census |
| 2010 | 100,552 | ▲ +2.4% | Census |
| 2015 | 99,368 | ▲ +1.2% | Census |
| 2020 | 98,199 | — | Census |
| 2025 | 97,017 | ▼ -1.2% | Census |
| 2030 | 94,660 | ▼ -3.6% | Projection |
| 2035 | 92,674 | ▼ -5.6% | Projection |
| 2040 | 90,517 | ▼ -7.8% | Projection |
| 2045 | 88,176 | ▼ -10.2% | Projection |
| 2050 | 85,580 | ▼ -12.9% | Projection |
About Saku
Overview
Saku (佐久市) is a municipality in Nagano, Japan, with a population of 97,017 as of 2025.
Population Projection of Saku
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Saku's population is expected to reach 94,660 by 2030 (-3.6%), 90,517 by 2040 (-7.8%), and 85,580 by 2050 (-12.9%). A modest population change is expected.
Aging Rate of Saku
The aging rate (percentage of residents aged 65 and over) is 30.9% as of 2020 and is projected to rise to 39.2% by 2050. The aging rate will remain below the most severe Japanese averages.
National Comparison
Saku's demographic trajectory is similar to the national average.
National and Prefectural Rank
- Population decline rate: Ranked #1540 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #1322 out of 1903 nationwide.
- Population size: Ranked #429 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