Kanagawa神奈川県
Nakai 中井町
Data last updated:
Nakai, Kanagawa, Japan has a population of 8,693 (2025 national census). IPSS projections estimate 8,287 by 2030 and 5,995 by 2050 (a decrease of about 35.5% from 2020), with the share of residents aged 65+ rising from 36.3% in 2020 to 51.4%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
8,693
2030
(Projection)
8,287
▼ -10.9%
2040
(Projection)
7,128
▼ -23.4%
2050
(Projection)
5,995
▼ -35.5%
Change vs. 2020 census
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Other municipalities in Kanagawa (神奈川県)
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.
Nakai 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 | 8,626 | ▼ -7.2% | Census |
| 1985 | 9,371 | ▲ +0.8% | Census |
| 1990 | 10,054 | ▲ +8.1% | Census |
| 1995 | 10,398 | ▲ +11.8% | Census |
| 2000 | 10,222 | ▲ +9.9% | Census |
| 2005 | 10,173 | ▲ +9.4% | Census |
| 2010 | 10,010 | ▲ +7.6% | Census |
| 2015 | 9,679 | ▲ +4.1% | Census |
| 2020 | 9,300 | — | Census |
| 2025 | 8,693 | ▼ -6.5% | Census |
| 2030 | 8,287 | ▼ -10.9% | Projection |
| 2035 | 7,712 | ▼ -17.1% | Projection |
| 2040 | 7,128 | ▼ -23.4% | Projection |
| 2045 | 6,529 | ▼ -29.8% | Projection |
| 2050 | 5,995 | ▼ -35.5% | Projection |
About Nakai
Overview
Nakai (中井町) is a municipality in Kanagawa, Japan, with a population of 8,693 as of 2025.
Population Projection of Nakai
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Nakai's population is expected to reach 8,287 by 2030 (-10.9%), 7,128 by 2040 (-23.4%), and 5,995 by 2050 (-35.5%). A significant population decline is projected over the next three decades.
Aging Rate of Nakai
The aging rate (percentage of residents aged 65 and over) is 36.3% as of 2020 and is projected to rise to 51.4% by 2050. More than half of residents will be seniors, placing the town in the "marginal municipality" category.
National Comparison
Nakai's population decline rate exceeds the national average.
National and Prefectural Rank
- Population decline rate: Ranked #879 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #472 out of 1903 nationwide.
- Population size: Ranked #1401 out of 1917 nationwide.
- Related: National rankings / All municipalities in Kanagawa
Earnings in Kanagawa (神奈川県): Average salary in Kanagawa (神奈川県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure