Hitachinaka is a city located in Ibaraki Prefecture, Japan. As of 1 July 2020, the city had an estimated population of 154,663 in 64,900 households and a population density of 1547 persons per km2. The percentage of the population aged over 65 was 26.1%. The total area of the city is 99.96 square kilometres (38.59 sq mi). It is a "hiragana city", the place name is written with the hiragana syllabary and not the traditional kanji.

Mito is the capital city of Ibaraki Prefecture, in the northern Kantō region of Japan. As of 1 January 2024, the city had an estimated population of 268,036 in 126,055 households and a population density of 1,233 persons per km2. The percentage of the population aged over 65 was 27.1%. The total area of the city is 217.32 square kilometres (83.91 sq mi).