Kochi高知県
Niyodogawa 仁淀川町
Data last updated:
Niyodogawa, Kochi, Japan has a population of 4,010 (2025 national census). IPSS projections estimate 3,548 by 2030 and 1,821 by 2050 (a decrease of about 62.3% from 2020), with the share of residents aged 65+ rising from 55.7% in 2020 to 61.1%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
4,010
2030
(Projection)
3,548
▼ -26.5%
2040
(Projection)
2,559
▼ -47.0%
2050
(Projection)
1,821
▼ -62.3%
Change vs. 2020 census
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Other municipalities in Kochi (高知県)
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.
Niyodogawa 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 | 11,672 | ▲ +141.8% | Census |
| 1985 | 10,333 | ▲ +114.1% | Census |
| 1990 | 9,518 | ▲ +97.2% | Census |
| 1995 | 8,919 | ▲ +84.8% | Census |
| 2000 | 8,189 | ▲ +69.6% | Census |
| 2005 | 7,347 | ▲ +52.2% | Census |
| 2010 | 6,500 | ▲ +34.7% | Census |
| 2015 | 5,551 | ▲ +15.0% | Census |
| 2020 | 4,827 | — | Census |
| 2025 | 4,010 | ▼ -16.9% | Census |
| 2030 | 3,548 | ▼ -26.5% | Projection |
| 2035 | 3,014 | ▼ -37.6% | Projection |
| 2040 | 2,559 | ▼ -47.0% | Projection |
| 2045 | 2,164 | ▼ -55.2% | Projection |
| 2050 | 1,821 | ▼ -62.3% | Projection |
About Niyodogawa
Overview
Niyodogawa (仁淀川町) is a municipality in Kochi, Japan, with a population of 4,010 as of 2025.
Population Projection of Niyodogawa
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Niyodogawa's population is expected to reach 3,548 by 2030 (-26.5%), 2,559 by 2040 (-47.0%), and 1,821 by 2050 (-62.3%). The town is projected to lose more than half its population over 30 years.
Aging Rate of Niyodogawa
The aging rate (percentage of residents aged 65 and over) is 55.7% as of 2020 and is projected to rise to 61.1% by 2050. More than half of residents will be seniors, placing the town in the "marginal municipality" category.
National Comparison
Niyodogawa is among the most rapidly declining municipalities in Japan.
National and Prefectural Rank
- Population decline rate: Ranked #43 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #81 out of 1903 nationwide.
- Population size: Ranked #1660 out of 1917 nationwide.
- Related: National rankings / All municipalities in Kochi
Earnings in Kochi (高知県): Average salary in Kochi (高知県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure