Koganei is a city situated in the western portion of the Tokyo Metropolis in Japan. It serves as a residential and urban area within the greater Tokyo region.
As of March 1, 2021, the city had an estimated population of 123,698 residing in 61,832 households. The total land area of Koganei is approximately 11.30 square kilometres (4.36 sq mi), resulting in a population density of about 11,000 persons per square kilometre.