Inashiki is a city located in Ibaraki Prefecture, Japan. As of 1 July 2020, the city had an estimated population of 39,127 in 14,733 households …Inashiki is a city located in Ibaraki Prefecture, Japan. As of 1 July 2020, the city had an estimated population of 39,127 in 14,733 households and a population density of 191 persons per km. The percentage of the population aged over 65 was 37.1%. The total area of the city is 205.81 square kilometres.