Tarumizu is a city situated in the Kagoshima Prefecture of Japan. It was officially founded on October 1, 1958.
The city covers a total area of 162.10 km² (62.59 sq mi). As of May 1, 2024, Tarumizu had an estimated population of 13,114 people living in 7,236 households, resulting in a population density of 81 persons per km².