Wikipedia
Jōkamachi
The term Jokamachi ( castle town) refers to a type of urban structures in Japan in which the city surrounds a feudal lord’s castle. These cities did not necessarily form around castles after the Edo period; some are known as Jinyamachi, cities that have evolved around Jinya or government offices that are not intended to provide military services. Defined broadly, Jokamachi includes Jinyamachi. It is also referred to as Joka as was common before the early modern period.