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.
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. +more1 °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.
Per Japanese census data, the population of Iruma has increased rapidly from the 1960s.
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. +more 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.
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. +more 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. +more 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. +more The prefecture also operates one special education school.
Iruma Air Base, located in Iruma and neighboring the city of Sayama is a facility of the Japan Air Self-Defense Force. The base holds an open house annually in early November. +more This airbase was formerly known as Johnson Air Base while under the control of the United States Air Force.
Iruma City Museum