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Iruma, Saitama

Coordinates: 35°50′8.9″N 139°23′28.1″E / 35.835806°N 139.391139°E / 35.835806; 139.391139
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Iruma City Hall
Iruma City Hall
Flag of Iruma
Official seal of Iruma
Location of Iruma in Saitama Prefecture
Location of Iruma in Saitama Prefecture
Iruma is located in Japan
Coordinates: 35°50′8.9″N 139°23′28.1″E / 35.835806°N 139.391139°E / 35.835806; 139.391139
 • MayorRichirō Sugiyama (from November 2020)
 • Total44.69 km2 (17.25 sq mi)
 (January 2021)
 • Total147,166
 • Density3,300/km2 (8,500/sq mi)
Time zoneUTC+9 (Japan Standard Time)
- TreeZelkova serrata
- FlowerCamellia sinensis
- BirdEurasian skylark
Phone number04-2964-1111
Address1-16-1 Toyooka, Iruma-shi, Saitama-ken 358-8511
WebsiteOfficial website
Tea fields in Iruma
Kasumi River in Iruma

Iruma (入間市, Iruma-shi) is a city located in Saitama Prefecture, Japan. As of 1 January 2021, the city had an estimated population of 147,166 in 66,516 households and a population density of 3300 persons per km2.[1] The total area of the city is 44.69 square kilometres (17.25 sq mi).


Located in the Sayama Highlands of far southern Saitama Prefecture, Iruma is bordered by Tokyo to the south. The Iruma River flows through the city.

Surrounding municipalities[edit]

Saitama Prefecture

Tokyo Metropolis


Iruma has a humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Iruma is 14.1 °C. The average annual rainfall is 1481 mm with September as the wettest month. The temperatures are highest on average in August, at around 25.9 °C, and lowest in January, at around 3.2 °C.[2]


Per Japanese census data,[3] the population of Iruma has recently plateaued after several decades of strong growth.

Historical population
1960 36,903—    
1970 65,639+77.9%
1980 104,034+58.5%
1990 137,585+32.3%
2000 147,909+7.5%
2010 149,872+1.3%
2020 145,671−2.8%


The area around Iruma was part of ancient Musashi Province and was noted for kilns producing Sue ware pottery in the Nara period and Heian period. During the Edo period, the area developed as a series of three post towns on the Nikkō Wakiōkan highway during the Edo period. The town of Toyooka and villages of Kaneko, Miyadera, Fujisawa and Higashikaneko were created within Iruma District, Saitama with the establishment of the modern municipalities system on April 1, 1889. The Imperial Japanese Army Air Academy established an airfield in the area in 1938, which later developed into Iruma Air Base. On April 1, 1954, Higashikaneko became Seibu Town. On September 30, 1956, Toyooka, Kaneko, Miyadera, Fujisawa and Seibu merged to form the town of Musashi. Musashi was elevated to city status on November 1, 1966, becoming the city of Iruma. Discussions to merge with the neighboring city of Sayama in 2005 failed to pass a referendum. In 2017 Japan became the first country ever to elect an openly transgender man to any public office when Tomoya Hosoda was elected as a councillor for the city of Iruma.[4][5]


Iruma has a mayor-council form of government with a directly elected mayor and a unicameral city council of 22 members. Iruma contributes two members to the Saitama Prefectural Assembly. In terms of national politics, the city is part of Saitama 9th district of the lower house of the Diet of Japan.


Iruma has a mixed economy with numerous industrial parks for light manufacturing and also serves as a regional commercial center. Due to its location, it is also a bedroom community for people commuting to the Tokyo metropolis for work. In terms of agriculture, Iruma and neighboring Sayama are famous for the green tea they produce.


  • Musashino Academia Musicae – Iruma campus
  • Iruma 16 public elementary schools and 11 public middle schools operated by the city government, and two public high schools operated by the Saitama Prefectural Board of Education. In addition, there is one combined private middle/high school and three private high schools. The prefecture also operates one special education school.



JR EastHachikō Line

Seibu Railway - Seibu Ikebukuro Line


Military facilities[edit]

Twin towns and sister cities[edit]

Iruma is twinned with:

Local attractions[edit]

  • Iruma City Museum

Noted people from Iruma[edit]


  1. ^ "Iruma city official statistics" (PDF) (in Japanese). Japan.
  2. ^ Iruma climate data
  3. ^ Iruma population statistics
  4. ^ Chloe Farand. "Japan becomes first country in the world to elect a transgender man to a public office". The Independent. Retrieved 2017-03-18.
  5. ^ "Japan just elected its first trans man into public office · PinkNews". Pinknews.co.uk. Retrieved 2017-03-18.
  6. ^ a b "International Exchange". List of Affiliation Partners within Prefectures. Council of Local Authorities for International Relations (CLAIR). Archived from the original on 4 January 2016. Retrieved 21 November 2015.

External links[edit]