Miyagi宮城県
Iwanuma 岩沼市
Data last updated:
Iwanuma, Miyagi, Japan has a population of 42,312 (2025 national census). IPSS projections estimate 41,990 by 2030 and 35,985 by 2050 (a decrease of about 18.3% from 2020), with the share of residents aged 65+ rising from 26.8% in 2020 to 38.4%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
42,312
2030
(Projection)
41,990
▼ -4.7%
2040
(Projection)
39,254
▼ -10.9%
2050
(Projection)
35,985
▼ -18.3%
Change vs. 2020 census
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Other municipalities in Miyagi (宮城県)
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.
Iwanuma 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 | 34,910 | ▼ -20.8% | Census |
| 1985 | 36,519 | ▼ -17.1% | Census |
| 1990 | 38,091 | ▼ -13.6% | Census |
| 1995 | 40,072 | ▼ -9.1% | Census |
| 2000 | 41,407 | ▼ -6.0% | Census |
| 2005 | 43,921 | ▼ -0.3% | Census |
| 2010 | 44,187 | ▲ +0.3% | Census |
| 2015 | 44,678 | ▲ +1.4% | Census |
| 2020 | 44,068 | — | Census |
| 2025 | 42,312 | ▼ -4.0% | Census |
| 2030 | 41,990 | ▼ -4.7% | Projection |
| 2035 | 40,677 | ▼ -7.7% | Projection |
| 2040 | 39,254 | ▼ -10.9% | Projection |
| 2045 | 37,682 | ▼ -14.5% | Projection |
| 2050 | 35,985 | ▼ -18.3% | Projection |
About Iwanuma
Overview
Iwanuma (岩沼市) is a municipality in Miyagi, Japan, with a population of 42,312 as of 2025.
Population Projection of Iwanuma
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Iwanuma's population is expected to reach 41,990 by 2030 (-4.7%), 39,254 by 2040 (-10.9%), and 35,985 by 2050 (-18.3%). A modest population change is expected.
Aging Rate of Iwanuma
The aging rate (percentage of residents aged 65 and over) is 26.8% as of 2020 and is projected to rise to 38.4% by 2050. The aging rate will remain below the most severe Japanese averages.
National Comparison
Iwanuma's demographic trajectory is similar to the national average.
National and Prefectural Rank
- Population decline rate: Ranked #1393 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #1377 out of 1903 nationwide.
- Population size: Ranked #755 out of 1917 nationwide.
- Related: National rankings / All municipalities in Miyagi
Earnings in Miyagi (宮城県): Average salary in Miyagi (宮城県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure