WebKawanishi, Hyōgo. / 34.833°N 135.417°E / 34.833; 135.417. Kawanishi (川西市, Kawanishi-shi) is a city located in Hyōgo Prefecture, Japan. As of 30 September 2022, the city had an estimated population of 155,165 and a population density of 2900 persons per km². [1] The total area of the city is 53.44 square kilometres (20.63 sq mi).