Hitachinaka, in its current administrative form, appeared on the map of Japan relatively recently—on November 1, 1994. The city was formed through the merger of two neighboring municipalities: the industrial city of Katsuta and the port city of Nakaminato. Despite its young official status, the history of human settlement in this area dates back to ancient times, long before the modern name emerged.
For centuries, the region's development was shaped by its favorable geographic location on the Pacific coast and the mouth of the Naka River, making it an ideal spot for fishing and maritime logistics. During the Edo period, the Nakaminato area served as a key outer port and transport hub for the Mito clan's holdings. It acted as a vital supply and trade route for one of the branches of the powerful Tokugawa shogunate family, fostering the prosperity of local trade traditions and maritime culture.
Historically, the economic structures of the two parts of the future city differed. While Nakaminato flourished as a bustling port, the Katsuta area was originally primarily agricultural. However, the situation changed dramatically in the 20th century as the district began to rapidly transform into a major industrial center. This development was closely tied to the Hitachi Corporation, which turned former fields into a technological hub, attracting investment and new residents.
The region's rich cultural past is also evidenced by much older monuments preserved in the vicinity. Within the city limits are famous burial mounds (kofun), such as the Torazuka Kofun, dating back to the 7th century. The unique murals and artifacts discovered within them confirm that a developed society with its own elite and complex social structure existed on these lands more than a thousand years ago.