Hokkaido北海道
Rumoi 留萌市
Data last updated:
Rumoi, Hokkaido, Japan has a population of 17,329 (2025 national census). IPSS projections estimate 15,735 by 2030 and 8,955 by 2050 (a decrease of about 55.5% from 2020), with the share of residents aged 65+ rising from 38.5% in 2020 to 53.6%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
17,329
2030
(Projection)
15,735
▼ -21.8%
2040
(Projection)
12,113
▼ -39.8%
2050
(Projection)
8,955
▼ -55.5%
Change vs. 2020 census
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Other municipalities in Hokkaido (北海道)
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.
Rumoi 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 | 36,626 | ▲ +82.1% | Census |
| 1985 | 35,542 | ▲ +76.7% | Census |
| 1990 | 32,429 | ▲ +61.2% | Census |
| 1995 | 30,060 | ▲ +49.4% | Census |
| 2000 | 28,325 | ▲ +40.8% | Census |
| 2005 | 26,826 | ▲ +33.4% | Census |
| 2010 | 24,457 | ▲ +21.6% | Census |
| 2015 | 22,221 | ▲ +10.5% | Census |
| 2020 | 20,114 | — | Census |
| 2025 | 17,329 | ▼ -13.8% | Census |
| 2030 | 15,735 | ▼ -21.8% | Projection |
| 2035 | 13,877 | ▼ -31.0% | Projection |
| 2040 | 12,113 | ▼ -39.8% | Projection |
| 2045 | 10,449 | ▼ -48.1% | Projection |
| 2050 | 8,955 | ▼ -55.5% | Projection |
About Rumoi
Overview
Rumoi (留萌市) is a municipality in Hokkaido, Japan, with a population of 17,329 as of 2025.
Population Projection of Rumoi
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Rumoi's population is expected to reach 15,735 by 2030 (-21.8%), 12,113 by 2040 (-39.8%), and 8,955 by 2050 (-55.5%). The town is projected to lose more than half its population over 30 years.
Aging Rate of Rumoi
The aging rate (percentage of residents aged 65 and over) is 38.5% as of 2020 and is projected to rise to 53.6% by 2050. More than half of residents will be seniors, placing the town in the "marginal municipality" category.
National Comparison
Rumoi is experiencing one of the faster rates of population decline in Japan.
National and Prefectural Rank
- Population decline rate: Ranked #153 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #340 out of 1903 nationwide.
- Population size: Ranked #1127 out of 1917 nationwide.
- Related: National rankings / All municipalities in Hokkaido
Earnings in Hokkaido (北海道): Average salary in Hokkaido (北海道) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure