川口市

Kawaguchi (川口市, Kawaguchi-shi) is a city located in southeastern Saitama Prefecture, Japan. As of 1 April 2025, the city had an estimated population of 595,011 in 293,582 households and a population density of 9605 persons per km². The total area of the city is 61.95 square kilometres (23.92 sq mi). It is the Greater Tokyo Area's 8th most populated city (after passing Hachioji), and second largest in Saitama Prefecture, after eponymous Saitama.