Koganei (小金井市,Koganei-shi) is acity located in thewestern portion of theTokyo Metropolis,Japan. As of 1 March 2021[update], the city had an estimated population of 123,698 in 61,832 households. The total area of the city is 11.30 square kilometres (4.36 sq mi) so thepopulation density is about 11,000 persons per km².[1]
Koganei is approximately at the center ofTokyo, and is located about 20 kilometers west ofShinjuku, whereTokyo Metropolitan Government has its headquarters. It is flanked on the north and the south by two large parks. To the north is Koganei Park, which includes theEdo-Tokyo Open Air Architectural Museum, a branch of theEdo-Tokyo Museum located inRyōgoku, Tokyo. To the south are Nogawa Park andTama Cemetery. The city has an elevation of between 40 and 70 meters above sea level.
Koganei has ahumid subtropical climate (KöppenCfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Koganei 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 25.5 °C, and lowest in January, at around 2.6 °C.[2]
The area of present-day Koganei was part of ancientMusashi Province. In the post-Meiji Restoration cadastral reform of July 22, 1878, the area became part of Kitatama District inKanagawa Prefecture. The village of Koganei was created on April 1, 1889 with the establishment of the modern municipalities system. Kitatama District was transferred to the administrative control of Tokyo Metropolis on April 1, 1893. Koganei was elevated to town status in 1937, and to city status in 1958.[4]
Koganei has amayor-council form of government with a directly elected mayor and aunicameral city council of 24 members. Koganei contributes one member to the Tokyo Metropolitan Assembly. In terms of national politics, the city is part ofTokyo 18th district of thelower house of theDiet of Japan.