Fussa (福生市, Fussa-shi) is a city located in the western portion of Tokyo Metropolis, Japan. As of 1 April 2021, the city had an estimated population of 56,786, and a population density of 5600 persons per km². The total area of the city is 10.16 square kilometres (3.92 sq mi). About one third of the city area is occupied by the United States Air Force Yokota Air Base, giving the city an effective population density of 8,782 persons per km2.