Ōno is a city located in Fukui Prefecture, Japan. As of 1 July 2018, the city had an estimated population of 33,640 in 11,747 households and the population density of 39 persons per km2. The total area of the city was 872.43 square kilometres. The town is encircled by a ring of mountains and the only way in or out is via tunnels or mountain roads.