Iwate岩手県
Nishiwaga 西和賀町
Data last updated:
Nishiwaga, Iwate, Japan has a population of 4,355 (2025 national census). IPSS projections estimate 3,777 by 2030 and 1,940 by 2050 (a decrease of about 62.2% from 2020), with the share of residents aged 65+ rising from 51.0% in 2020 to 60.1%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
4,355
2030
(Projection)
3,777
▼ -26.4%
2040
(Projection)
2,760
▼ -46.2%
2050
(Projection)
1,940
▼ -62.2%
Change vs. 2020 census
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Other municipalities in Iwate (岩手県)
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.
Nishiwaga 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 | 9,989 | ▲ +94.6% | Census |
| 1985 | 9,520 | ▲ +85.4% | Census |
| 1990 | 8,973 | ▲ +74.8% | Census |
| 1995 | 8,594 | ▲ +67.4% | Census |
| 2000 | 7,983 | ▲ +55.5% | Census |
| 2005 | 7,375 | ▲ +43.7% | Census |
| 2010 | 6,602 | ▲ +28.6% | Census |
| 2015 | 5,880 | ▲ +14.5% | Census |
| 2020 | 5,134 | — | Census |
| 2025 | 4,355 | ▼ -15.2% | Census |
| 2030 | 3,777 | ▼ -26.4% | Projection |
| 2035 | 3,234 | ▼ -37.0% | Projection |
| 2040 | 2,760 | ▼ -46.2% | Projection |
| 2045 | 2,326 | ▼ -54.7% | Projection |
| 2050 | 1,940 | ▼ -62.2% | Projection |
About Nishiwaga
Overview
Nishiwaga (西和賀町) is a municipality in Iwate, Japan, with a population of 4,355 as of 2025.
Population Projection of Nishiwaga
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Nishiwaga's population is expected to reach 3,777 by 2030 (-26.4%), 2,760 by 2040 (-46.2%), and 1,940 by 2050 (-62.2%). The town is projected to lose more than half its population over 30 years.
Aging Rate of Nishiwaga
The aging rate (percentage of residents aged 65 and over) is 51.0% as of 2020 and is projected to rise to 60.1% by 2050. More than half of residents will be seniors, placing the town in the "marginal municipality" category.
National Comparison
Nishiwaga is among the most rapidly declining municipalities in Japan.
National and Prefectural Rank
- Population decline rate: Ranked #44 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #102 out of 1903 nationwide.
- Population size: Ranked #1630 out of 1917 nationwide.
- Related: National rankings / All municipalities in Iwate
Earnings in Iwate (岩手県): Average salary in Iwate (岩手県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure