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Takekoma Shrine, Kanahebisui ShrineAbukuma River, Iwanuma Station Iwanuma urban area, Dontosai festival
Takekoma Shrine, Kanahebisui Shrine
Abukuma River, Iwanuma Station
Iwanuma urban area, Dontosai festival
Flag of Iwanuma
Official seal of Iwanuma
Location of Iwanuma in Miyagi Prefecture
Location of Iwanuma in Miyagi Prefecture
Iwanuma is located in Japan
Coordinates: 38°06′15.4″N 140°52′12.6″E / 38.104278°N 140.870167°E / 38.104278; 140.870167Coordinates: 38°06′15.4″N 140°52′12.6″E / 38.104278°N 140.870167°E / 38.104278; 140.870167
Country Japan
Region Tōhoku
Prefecture Miyagi
 • Mayor Tsuneaki Iguchi
 • Total 60.45 km2 (23.34 sq mi)
Population (August 2017)
 • Total 44,738
 • Density 740/km2 (1,900/sq mi)
Time zone Japan Standard Time (UTC+9)
- Tree Japanese Black Pine
- Flower Azalea
- Bird Seagull
Phone number 0223-22-1111
Address 1-6-20 Sakura, Iwanuma-shi, Miyagi-ken 989-2480
Website http://www.city.iwanuma.miyagi.jp/
Iwanuma City Hall

Iwanuma (岩沼市, Iwanuma-shi) is a city located in Miyagi Prefecture, Japan. As of 1 August 2017, the city had an estimated population of 44,738, and a population density of 740 persons per km². The total area of the city is 60.45 square kilometres (23.34 sq mi). Iwanuma is at the convergence of two ancient roads, the Tōkaidō and the Rikuzen-Hama Kaidō.


Iwanuma is in the east-center Miyagi Prefecture, bordered by the Pacific Ocean to the east. It is also located at the mouth of the Abukuma River.

Neighboring municipalities[edit]


Per Japanese census data,[1] the population of Iwanuma has increased over the past 40 years.

Census Year Population
1970 29,822
1980 34,910
1990 38,091
2000 41,407
2010 44,187


Iwanuma has a humid climate (Köppen climate classification Cfa) characterized by mild summers and cold winters. The average annual temperature in Iwanuma is 12.6 °C. The average annual rainfall is 1252 mm with September as the wettest month.The temperatures are highest on average in August, at around 24.9 °C, and lowest in January, at around 1.6 °C.[2]


The area of present-day Iwanuma was part of ancient Mutsu Province, and the Takekoma Inari Shrine claims to have been founded in 842 AD. Mention of “Iwanuma Castle” appears in early Muromachi period documents. The area came under the control of the Date clan of Sendai Domain during the Edo period, under the Tokugawa shogunate. The town of Iwanuma was established on June 1, 1889 with the establishment of the modern municipalities system.

The village of Okuma merged with Iwanuma on January 11, 1947, followed by Sengan and Tamaura on April 1, 1955. Iwanuma was raised to city status on November 1, 1971.

The city was seriously affected by the tsunami associated with the 2011 Tōhoku earthquake,[3] which resulted in 180 deaths.


Iwanuma has a mayor-council form of government with a directly elected mayor and a unicameral city legislature of 20 members.


Iwanuma has four public elementary school and four public middle schools operated by the city government, and one public high school operated by the Miyagi Prefectural Board of Education. The prefectural also operates a special education school.





  • Iwanuma Community FM Station

Local attractions[edit]

Sister city relations[edit]

Noted people from Iwanuma[edit]


External links[edit]

Media related to Iwanuma at Wikimedia Commons