Niigata新潟県
Nagaoka 長岡市
Data last updated:
Nagaoka, Niigata, Japan has a population of 251,069 (2025 national census). IPSS projections estimate 245,260 by 2030 and 197,104 by 2050 (a decrease of about 26.2% from 2020), with the share of residents aged 65+ rising from 31.4% in 2020 to 41.1%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
251,069
2030
(Projection)
245,260
▼ -8.1%
2040
(Projection)
221,942
▼ -16.9%
2050
(Projection)
197,104
▼ -26.2%
Change vs. 2020 census
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Other municipalities in Niigata (新潟県)
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.
Nagaoka 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 | 289,234 | ▲ +8.4% | Census |
| 1985 | 291,251 | ▲ +9.1% | Census |
| 1990 | 290,923 | ▲ +9.0% | Census |
| 1995 | 293,250 | ▲ +9.9% | Census |
| 2000 | 292,887 | ▲ +9.7% | Census |
| 2005 | 288,457 | ▲ +8.1% | Census |
| 2010 | 282,674 | ▲ +5.9% | Census |
| 2015 | 275,133 | ▲ +3.1% | Census |
| 2020 | 266,936 | — | Census |
| 2025 | 251,069 | ▼ -5.9% | Census |
| 2030 | 245,260 | ▼ -8.1% | Projection |
| 2035 | 233,826 | ▼ -12.4% | Projection |
| 2040 | 221,942 | ▼ -16.9% | Projection |
| 2045 | 209,566 | ▼ -21.5% | Projection |
| 2050 | 197,104 | ▼ -26.2% | Projection |
About Nagaoka
Overview
Nagaoka (長岡市) is a municipality in Niigata, Japan, with a population of 251,069 as of 2025.
Population Projection of Nagaoka
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Nagaoka's population is expected to reach 245,260 by 2030 (-8.1%), 221,942 by 2040 (-16.9%), and 197,104 by 2050 (-26.2%). A significant population decline is projected over the next three decades.
Aging Rate of Nagaoka
The aging rate (percentage of residents aged 65 and over) is 31.4% as of 2020 and is projected to rise to 41.1% by 2050. Over 40% of residents will be elderly, significantly affecting healthcare and social services needs.
National Comparison
Nagaoka's population decline rate exceeds the national average.
National and Prefectural Rank
- Population decline rate: Ranked #1168 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #1159 out of 1903 nationwide.
- Population size: Ranked #122 out of 1917 nationwide.
- Related: National rankings / All municipalities in Niigata
Earnings in Niigata (新潟県): Average salary in Niigata (新潟県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure