Sakai (堺市, Sakai-shi) is a city located in Osaka Prefecture, Japan. As of 1 January 2022, the city had an estimated population of 819,965 in 367,251 households and a population density of 5500 persons per km². The total area of the city is 149.82 square kilometres (57.85 sq mi). The city is the fourteenth most populous city in Japan (excluding Tokyo),.