WEBŌnojō (大野城市, Ōnojō-shi) is an area located in Fukuoka Prefecture, Japan. Its name is made up of the kanji for 'big', 'field', and ' castle '. As of 31 March 2024, the city had an estimated population of 102,818 in 46689 households, and a population density of 3800 persons per km². [1]