Tokorozawa, Saitama

Tokorozawa (所沢市, Tokorozawa-shi) is a city located in Saitama Prefecture, Japan. As of 1 February 2024^[update], the city had an estimated population of 343,298 in 168,939 households and a population density of 4761 persons per km². The total area of the city is 72.11 square kilometres (27.84 sq mi).

Tokorozawa is located in the central part of the Musashino Terrace in southern Saitama, about 30 km west of central Tokyo. Tokorozawa can be considered part of the greater Tokyo area; its proximity to the latter and lower housing costs make it a popular commuter town. The Higashikawa and Yanasegawa rivers that flow from the Sayama Hills flow to the eastern part of the city, and finally reach the Arakawa River. The Yamaguchi Reservoir (commonly known as Lake Sayama) is mostly located within city boundaries; Lake Tama also touches the south-western part of the city.

The area around Tokorozawa Station's west exit is built up as a shopping district with several department stores. Prope Street is a popular shopping arcade.

Tokorozawa has a humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Tokorozawa is 14.0 °C. The average annual rainfall is 1647 mm with September as the wettest month. The temperatures are highest on average in August, at around 25.7 °C, and lowest in January, at around 2.3 °C.

Per Japanese census data, the population of Tokorozawa has recently plateaued after several decades of strong growth.

Archaeological research has shown that the vicinity of Tokorozawa was settled from about 20,000 years ago. Tokorozawa Shinmei Shrine has a traditional establishment of 110 AD. Hatogamine Hachiman Shrine is believed to date from 921 AD. During the Kamakura period, the Kamakura Kaidō ran through the area and the area was host to a series of battles fought in May 1333 that were part of the Genko War that ultimately ended the Kamakura Shogunate. These include the 1333 Battle of Kotesashi and the Battle of Kumegawa. Kotesashi was again the site of another battle nineteen years later. During the Edo period (1603–1867) the area's major industry was sericulture. It was also an important trading center, being located at the intersection of roads connecting Edo with the towns of Hachioji, Chichibu, Kawagoe and Fuchu.

The town of Tokorozawa was created within Iruma District, Saitama with the establishment of the modern municipalities system on April 1, 1889.

Tokorozawa became the site of Japan's first air base and air service academy in 1911. The base was used through the end of World War II and fell under the control of the United States Armed Forces after the war. The US returned most of its property in Tokorozawa to Japan in 1971, but retains a communications facility in the city which is operated by the 374th Airlift Wing of the Fifth Air Force, based at Yokota Air Base to the southwest. The facility houses antennas for communications with USAF aircraft in the region. Much of the land returned to Japan has been converted into the public Tokorozawa Aviation Memorial Park.