During the Edo period, it was a rural region classified as tenryō territory controlled directly by the Tokugawa shogunate, but administered through various hatamoto.

In the cadastral reform of April 1, 1889, the area was divided into the villages of Tana, Nakazato and Yamauchi in Tsuzuki District (都筑郡田奈村, 中里村, 山内村, Tsuzuki-gun Tana-mura, Nakazato-mura, Yamauchi-mura).

The core of the Kōhoku New Town became a significant commercial centre once the subway line extension between Shin-Yokohama and Azamino was completed in 1993.

The influx of new population resulted in the entire “Kōhoku New Town” being re-organized into the new Tsuzuki Ward.

[1] Aoba Ward is largely a regional commercial center and bedroom community for central Yokohama, Kawasaki and Tokyo.

The far-northern end of Aoba and the Yamoto River (谷本川, Yamoto-gawa) valley area retained some residual agriculture into the 1990s, when real-estate developers converted much of the farmlands and orchards into subdivisions and condominiums.