It was centered at what is now the Yokosuka (横渚) area of the city of Kamogawa in modern Chiba Prefecture.
In 1868, Iesato was demoted in status to that of an ordinary daimyō, and assigned the newly created Shizuoka Domain, which included all of former Sunpu Domain, neighboring Tanaka and Ojima Domains, and additional lands in Tōtōmi and Mutsu Provinces for a total revenue of 700,000 koku.
In the process, the existing daimyōs in Suruga and Tōtōmi Provinces were displaced.
This included the eighth (and final) daimyō of Yokosuka Domain, Nishio Tadaatsu.
As Tadaatsu had proved his loyalty to the new Meiji government by contributed his forces to the imperial armies during the Boshin War despite his status as a fudai daimyō, he was allowed to keep his revenues of 35,000 koku, but was transferred to the newly created Hanabusa Domain in Awa Province.