Ichikawa (, Ichikawa-shi) is a city located in northwest Chiba, Japan, approximately 20 kilometers from the center of Tokyo. The city was founded on November 3, 1934. As of January 1, 2011, the city has an estimated population of 474,586 and a density of 8,259.42 persons perSquare kilometers. The total area is 57.46Square kilometers. Ichikawa is also the home of the chief of the ground staff of the Japan Ground Self-Defense Force, the Colton Plaza shopping mall. Its close proximity to Tokyo makes it a convenient location for commuters; it is connected to Tokyo by the JR Chuo-Sobu Line, the Toei Shinjuku Line, the Tokyo Metro Tozai Line, the Toei Asakusa Line, and the Keisei Line.