As of 1 May 2011, the city had an estimated population of 263,372, with 114,325 households and a population density of 1,377.25 persons per km². Its total area is 191.23 km². The city is situated in the north-eastern part of Tokushima Prefecture at the mouth of the Yoshino River. In terms of layout and organization, Tokushima displays the typical characteristics of a Japanese castle town. Tokushima was developed under the Hachisuka clan. Its prosperity was built on a strong indigo dye industry.