Ōhama Domain

In the han system, Ōhama was a political and economic abstraction based on periodic cadastral surveys and projected agricultural yields.

[1] In other words, the domain was defined in terms of kokudaka, not land area.

Tadatomo had been a high-income hatamoto with holdings in the Saku district of Shinano Province He was a page and later an assistant to the 10th shōgun, Tokugawa Ienari.

[citation needed] In 1768, Mizuno became a head of the han of over 10,000 koku.

[3] Tadatomo's family was later transferred to the Numazu Domain;[citation needed] and a cadet branch of the Mizuno clan remained at Numazu until the Meiji Restoration.