Chiba Prefecture Tomisato has a humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall.

During the Edo period, Tomisato was part of Shimōsa Province and was an area where the Tokugawa Shogunate had numerous ranches for raising horse.

After the Meiji restoration, Tomisato Village was founded on April 1, 1889 within Inba District, Chiba Prefecture with the establishment of the modern municipalities system, and the government encouraged the settlement of the area by farmers.

Tomisato has a mayor-council form of government with a directly elected mayor and a unicameral city council of 18 members.

In terms of national politics, the city is part of Chiba 13th district of the lower house of the Diet of Japan.